CN112002055A - Lottery anti-counterfeiting method and system based on RFID (radio frequency identification) label - Google Patents
Lottery anti-counterfeiting method and system based on RFID (radio frequency identification) label Download PDFInfo
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- CN112002055A CN112002055A CN202010908738.3A CN202010908738A CN112002055A CN 112002055 A CN112002055 A CN 112002055A CN 202010908738 A CN202010908738 A CN 202010908738A CN 112002055 A CN112002055 A CN 112002055A
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C15/00—Generating random numbers; Lottery apparatus
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q30/00—Commerce
- G06Q30/018—Certifying business or products
- G06Q30/0185—Product, service or business identity fraud
Abstract
The invention discloses a lottery anti-counterfeiting method and a lottery anti-counterfeiting system based on an RFID label.A current lottery printing end acquires first lottery serial number information of a printing surface of a prefabricated lottery, and sends the first lottery serial number information, first betting information to be printed on a hot printing surface, first user identification information for purchasing a lottery and first lottery site selling information corresponding to the current lottery printing end as first lottery safety information to a lottery service end; the lottery service end receives and encrypts the first lottery security information to obtain first encrypted lottery information, and returns the first encrypted lottery information to the current lottery printing end; the current lottery ticket printing end writes the first encrypted lottery ticket information into the RFID label of the prefabricated lottery ticket, and prints the first betting information on the hot printing surface of the prefabricated lottery ticket to obtain the betted lottery ticket. The invention can ensure the security of the encrypted information, thereby improving the security of the lottery ticket.
Description
Technical Field
The invention relates to the technical field of lottery anti-counterfeiting, in particular to a lottery anti-counterfeiting method and a lottery anti-counterfeiting system based on an RFID label.
Background
The Chinese welfare lottery is born under the background that China obeys to reform open situations and concerns about difficult groups. Chinese welfare lottery tickets include scratch-off, two-color ball, 3D, local fun, seven-fun, 35 select 7, 29 select 7, 25 select 4, oriental 6+1, day-day music, and time-of-day, etc., and for many players today, the desire to be able to enjoy an overnight fun through the lottery ticket is overwhelming. However, some lawbreakers go the way to fake tickets to collect the prize money in order to be able to take the huge amount of money. Therefore, the existing lottery tickets basically have a plurality of anti-counterfeiting marks to ensure the authenticity judgment of the lottery tickets, but the security information on the lottery tickets needs to be specifically presented on paper, so that the lottery tickets have the risks of small information amount, limited anti-counterfeiting means which can be adopted and easy cracking, thereby influencing the security of the lottery tickets.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: an anti-counterfeiting method and an anti-counterfeiting system of a lottery based on an RFID label are provided to improve the security of the lottery.
In order to solve the technical problems, the invention adopts the technical scheme that:
the lottery anti-counterfeiting method based on the RFID label comprises the following steps:
s1, the current lottery printing end acquires first lottery serial number information of a printing surface of a prefabricated lottery, and the first lottery serial number information, the first betting information to be printed on a hot printing surface, the first user identification information for purchasing a lottery and the first lottery site selling information corresponding to the current lottery printing end are used as first lottery safety information and sent to a lottery service end;
s2, the lottery service end receives and encrypts the first lottery security information to obtain first encrypted lottery information, and the first encrypted lottery information is returned to the current lottery printing end;
and S3, the current lottery ticket printing end writes the first encrypted lottery ticket information into the RFID label of the prefabricated lottery ticket, and prints the first betting information on the hot printing surface of the prefabricated lottery ticket to obtain the betted lottery ticket.
In order to solve the technical problem, the invention adopts another technical scheme as follows:
the lottery anti-counterfeiting system based on the RFID label comprises a current lottery printing end and a lottery service end, wherein the current lottery printing end comprises a first memory, a first processor and a first computer program which is stored on the first memory and can run on the first processor, the lottery service end comprises a second memory, a second processor and a second computer program which is stored on the second memory and can run on the second processor, and the first processor realizes the following steps when executing the first computer program:
s1, acquiring first ticket paper serial number information of a printed surface of a prefabricated lottery ticket, and sending the first ticket paper serial number information, first betting information to be printed on a hot-printed surface, first user identity information for purchasing the lottery ticket and first lottery ticket site selling information corresponding to the current lottery ticket printing end as first lottery ticket safety information to a lottery ticket server end;
the second processor, when executing the second computer program, implements the steps of:
s2, receiving and encrypting the first lottery security information to obtain first encrypted lottery information, and returning the first encrypted lottery information to the current lottery printing end;
the first processor, when executing the first computer program, implements the steps of:
and S3, writing the first encrypted lottery ticket information into the RFID label of the prefabricated lottery ticket, and printing first betting information on the hot printing surface of the prefabricated lottery ticket to obtain a bet lottery ticket.
The invention has the beneficial effects that: the RFID label is implanted in the existing lottery, the RFID label can store more safety information and does not need to be displayed on a paper surface, and for the safety information needing anti-counterfeiting, more effective and safe encryption algorithms can be used for encryption to ensure the safety of the encryption information, so that the safety of the lottery is improved.
Drawings
Fig. 1 is a schematic flow chart of a lottery anti-counterfeiting method based on an RFID tag according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a lottery anti-counterfeiting system based on an RFID tag according to an embodiment of the present invention.
Description of reference numerals:
1. a lottery anti-counterfeiting system based on the RFID label; 2. the current lottery ticket printing end; 3. a first processor; 4. a first memory; 5. a lottery service terminal; 6. a second processor; 7. a second memory.
Detailed Description
In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Referring to fig. 1, the lottery anti-counterfeiting method based on the RFID tag includes the steps of:
s1, the current lottery printing end acquires first lottery serial number information of a printing surface of a prefabricated lottery, and the first lottery serial number information, the first betting information to be printed on a hot printing surface, the first user identification information for purchasing a lottery and the first lottery site selling information corresponding to the current lottery printing end are used as first lottery safety information and sent to a lottery service end;
s2, the lottery service end receives and encrypts the first lottery security information to obtain first encrypted lottery information, and the first encrypted lottery information is returned to the current lottery printing end;
and S3, the current lottery ticket printing end writes the first encrypted lottery ticket information into the RFID label of the prefabricated lottery ticket, and prints the first betting information on the hot printing surface of the prefabricated lottery ticket to obtain the betted lottery ticket.
From the above description, the beneficial effects of the present invention are: the RFID label is implanted into the existing lottery ticket, can store more safety information and does not need to be displayed on a paper surface, and for the safety information needing anti-counterfeiting, more effective and safe encryption algorithms can be used for encryption to ensure the safety of the encryption information, so that the safety of the lottery ticket is improved.
Further, in step S1, the first lottery website selling information includes a terminal unique identifier of the current lottery printing end and first unique selling serial number information of the current lottery printing end, and the first lottery website selling information and the first unique selling serial number information are used as first circulation identification information;
the step S2 specifically includes the following steps:
s21, the lottery service end receives and encrypts the first lottery security information to obtain first encrypted lottery information;
s22, the lottery service side randomly generates a random number N within 1-M, randomly selects N-1 lottery sites, and obtains terminal unique identifiers of other lottery printing ends in each lottery site to obtain N-1 terminal unique identifiers, wherein M is the number of current lottery printing ends in a preset range;
s23, the lottery service end returns the terminal unique identification of the other lottery printing ends with the random number N, N-1 and the first encrypted lottery information to the current lottery printing end;
the step S3 specifically includes the following steps:
s31, the current lottery printing end acquires the random number N, the terminal unique identifiers of the N-1 other lottery printing ends and the first encrypted lottery information, randomly divides the first encrypted lottery information into N pieces of first encrypted lottery sub information, and records the sequencing information of each piece of first encrypted lottery sub information;
s32, storing at least one piece of first encrypted lottery ticket sub information by the current lottery ticket printing end, writing the first circulation identification information and the stored first encrypted lottery ticket sub information into the RFID label of the prefabricated lottery ticket, and printing first betting information on the hot printing surface to obtain a betted lottery ticket;
s33, the current lottery ticket printing end randomly distributes the rest N-1 parts of the first encrypted lottery ticket sub information attached with the first circulation identification information and the corresponding sequencing information to N-1 other lottery ticket printing ends corresponding to the unique identifications of the N-1 terminals, so that at least one part of the first encrypted lottery ticket sub information is stored in each other lottery ticket printing end;
s34, the current lottery printing end records the binding relationship between the terminal unique identifier of each other lottery printing end and the stored ordering information corresponding to the first encrypted lottery sub-information to obtain first lottery storage information, and returns the first encrypted lottery information and the first lottery storage information to the lottery service end;
s35, the lottery service end receives the first encrypted lottery information and the first lottery storage information, deletes the stored first encrypted lottery information, and associates and stores the first circulation identification information, the first lottery storage information, the first bet information and the first user identification information.
It can be known from the above description that the lottery information is divided into a plurality of pieces of first encrypted lottery information and stored in a plurality of current lottery printing terminals, so that the information on each lottery printing terminal is incomplete, and the lottery service terminal only stores the position where each piece of first encrypted lottery information is stored and the corresponding sorting information, i.e. does not store the complete first encrypted lottery information, so that an illegal party cannot obtain the complete lottery information through the lottery service terminal to play a lottery, and if the complete lottery information is desired, the lottery service terminal needs to be pretended to send an instruction or illegally invade all the lottery printing terminals, thereby increasing the difficulty of illegally obtaining the complete lottery information, and further improving the security of the lottery.
Further, the step S32 of storing at least one copy of the first encrypted lottery ticket information at the current lottery ticket printing end specifically includes: the current lottery printing end stores at least two copies of the first encrypted lottery sub-information;
in the step S33, the step of storing at least one piece of the first encrypted lottery ticket information on each of the other lottery ticket printing terminals specifically includes: so that at least two copies of the first encrypted lottery ticket sub information are stored on each other lottery ticket printing terminal and each copy of the first encrypted lottery ticket sub information is stored on at least two other lottery ticket printing terminals.
It can be known from the above description that each piece of the first encrypted lottery ticket information is at least stored in two other lottery ticket printing ends, so as to play a backup role, and avoid the problem of complete lottery ticket information loss caused by damage of a local lottery ticket printing end.
Further, the step S3 is followed by the following steps:
s4, the lottery ticket verifying end sends the identified second user identity identification information, second ticket paper serial number information of the printing surface of the lottery ticket to be verified, second betting information and second lottery ticket site selling information of the hot printing surface of the lottery ticket to be verified, and second circulation identification information and second encrypted lottery ticket information which are obtained from the RFID label of the lottery ticket to be verified to the lottery ticket server end as second lottery ticket safety information for verification;
s5, the lottery service end receives and judges whether the second circulation identification information exists, if yes, the betting information and the user identification information which are bound when the lottery is printed are obtained according to the second circulation identification information and are respectively the same as the second betting information and the second user identification information, if yes, the terminal unique identification which is corresponding to the second lottery storage information which is bound when the lottery is printed by the second circulation identification information is obtained, and the terminal unique identification which is corresponding to the second lottery storage information is returned to the lottery verification end;
s6, the lottery verifying terminal receives the terminal unique identifier corresponding to the second lottery storage information, acquires other second encrypted lottery sub-information from the lottery printing terminal corresponding to each terminal unique identifier corresponding to the second lottery storage information according to the second circulation identifier information, judges whether the second encrypted lottery sub-information with the same sequencing information is the same, if the judgment results are the same, acquires the second encrypted lottery sub-information corresponding to each sequencing information, forms second encrypted lottery information according to the sequence relation of the sequencing information, and returns the second circulation identifier information and the second encrypted lottery information to the lottery service terminal;
s7, the lottery service end receives the second circulation identification information and the second encrypted lottery information, decrypts the second encrypted lottery information to obtain legal lottery security information, respectively performs consistency comparison on legal ticket paper serial number information, legal betting information, legal user identification information and legal lottery site selling information in the legal lottery security information and the second ticket paper serial number information, the second betting information, the second user identification information and the second lottery site selling information in the second lottery security information, if all the comparison is successful, the verification result of the lottery to be verified is a true ticket, if one is inconsistent, the verification result of the lottery to be verified is a false ticket, and returns the verification result to the lottery verification end.
As can be seen from the above description, on the premise of storing multiple copies of encrypted lottery ticket sub-information, the encrypted lottery ticket sub-information of the same ordering information stored by different lottery ticket printing terminals should be the same, so that identity verification is performed on the encrypted lottery ticket sub-information first, if the encrypted lottery ticket sub-information is different, it indicates that there is a security risk, and if the encrypted lottery ticket sub-information is the same, all the obtained encrypted lottery ticket sub-information are combined into complete encrypted lottery ticket information for decryption verification, thereby further improving security of the lottery ticket.
Further, in the step S22, the lottery service end also randomly generates N random numbers with different lengths, where the sum of the N random numbers with different lengths is equal to the length of the first encrypted lottery information;
the lottery service end in the step S23 further returns the N random numbers with the length to the current lottery printing end;
the step S31 specifically includes the following steps: the current lottery printing end acquires N, N random numbers with the length, unique terminal identifiers of the N-1 other lottery printing ends and the first encrypted lottery information, divides the first encrypted lottery information into N pieces of first encrypted lottery sub information according to the N random numbers with the length, and records the sequencing information of each piece of the first encrypted lottery sub information;
in step S34, the first lottery ticket storage information further includes a length random number corresponding to the first encrypted lottery ticket sub information stored by the current lottery ticket printing terminal;
in the step S35, the lottery service end further stores the length random number in association with the second encrypted lottery ticket information to be verified in the subsequent verification, so as to verify the length of the second encrypted lottery ticket information in bytes.
As can be seen from the above description, on one hand, the byte lengths of the divided pieces of the first encrypted lottery ticket sub-information are randomly generated, that is, different from each other, thereby increasing the counterfeiting difficulty, and on the other hand, when the encrypted lottery ticket sub-information is subsequently obtained, the byte length is verified, so that the validity of the encrypted lottery ticket sub-information can be verified, and when a security risk exists, which data of the lottery ticket printing end has a problem can be known, thereby timely obtaining the security risk and improving the security of the lottery ticket.
Referring to fig. 2, the lottery anti-counterfeiting system based on the RFID tag includes a current lottery printing end and a lottery service end, the current lottery printing end includes a first memory, a first processor, and a first computer program stored in the first memory and operable on the first processor, the lottery service end includes a second memory, a second processor, and a second computer program stored in the second memory and operable on the second processor, and the first processor implements the following steps when executing the first computer program:
s1, acquiring first ticket paper serial number information of a printed surface of a prefabricated lottery ticket, and sending the first ticket paper serial number information, first betting information to be printed on a hot-printed surface, first user identity information for purchasing the lottery ticket and first lottery ticket site selling information corresponding to the current lottery ticket printing end as first lottery ticket safety information to a lottery ticket server end;
the second processor, when executing the second computer program, implements the steps of:
s2, receiving and encrypting the first lottery security information to obtain first encrypted lottery information, and returning the first encrypted lottery information to the current lottery printing end;
the first processor, when executing the first computer program, implements the steps of:
and S3, writing the first encrypted lottery ticket information into the RFID label of the prefabricated lottery ticket, and printing first betting information on the hot printing surface of the prefabricated lottery ticket to obtain a bet lottery ticket.
From the above description, the beneficial effects of the present invention are: the RFID label is implanted into the existing lottery ticket, can store more safety information and does not need to be displayed on a paper surface, and for the safety information needing anti-counterfeiting, more effective and safe encryption algorithms can be used for encryption to ensure the safety of the encryption information, so that the safety of the lottery ticket is improved.
Further, in step S1, the first lottery website selling information includes a terminal unique identifier of the current lottery printing end and first unique selling serial number information of the current lottery printing end, and the first lottery website selling information and the first unique selling serial number information are used as first circulation identification information;
the step S2 specifically includes the following steps:
s21, receiving and encrypting the first lottery ticket security information to obtain first encrypted lottery ticket information;
s22, randomly generating a random number N within 1-M, randomly selecting N-1 lottery sites, and acquiring terminal unique identifiers of other lottery printing ends in each lottery site to obtain N-1 terminal unique identifiers, wherein M is the number of current lottery printing ends in a preset range;
s23, returning the terminal unique identifiers of the N, N-1 random numbers of the other lottery printing terminals and the first encrypted lottery information to the current lottery printing terminal;
the step S3 specifically includes the following steps:
s31, acquiring the random number N, the terminal unique identification of the N-1 other lottery printing terminals and the first encrypted lottery information, randomly dividing the first encrypted lottery information into N pieces of first encrypted lottery sub-information, and recording the sequencing information of each piece of the first encrypted lottery sub-information;
s32, storing at least one piece of the first encrypted lottery ticket sub information, writing the first circulation identification information and the stored first encrypted lottery ticket sub information into the RFID label of the prefabricated lottery ticket, and printing first betting information on a hot printing surface to obtain a betted lottery ticket;
s33, randomly distributing the rest N-1 parts of the first encrypted lottery ticket sub information with the first circulation identification information and the corresponding sequencing information to N-1 other lottery ticket printing terminals corresponding to the unique identifications of the N-1 terminals, so that at least one part of the first encrypted lottery ticket sub information is stored in each other lottery ticket printing terminal;
s34, recording the binding relationship between the terminal unique identifier of each other lottery printing terminal and the stored ordering information corresponding to the first encrypted lottery sub-information to obtain first lottery storage information, and returning the first encrypted lottery information and the first lottery storage information to a lottery service terminal;
s35, receiving the first encrypted lottery information and the first lottery storage information, deleting the stored first encrypted lottery information, and associating and storing the first circulation identification information, the first lottery storage information, the first bet information, and the first user identification information.
It can be known from the above description that the lottery information is divided into a plurality of pieces of first encrypted lottery information and stored in a plurality of current lottery printing terminals, so that the information on each lottery printing terminal is incomplete, and the lottery service terminal only stores the position where each piece of first encrypted lottery information is stored and the corresponding sorting information, i.e. does not store the complete first encrypted lottery information, so that an illegal party cannot obtain the complete lottery information through the lottery service terminal to play a lottery, and if the complete lottery information is desired, the lottery service terminal needs to be pretended to send an instruction or illegally invade all the lottery printing terminals, thereby increasing the difficulty of illegally obtaining the complete lottery information, and further improving the security of the lottery.
Further, the step S32 of storing at least one piece of the first encrypted lottery ticket information specifically includes: storing at least two copies of the first encrypted lottery ticket sub-information;
in the step S33, the step of storing at least one piece of the first encrypted lottery ticket information on each of the other lottery ticket printing terminals specifically includes: so that at least two copies of the first encrypted lottery ticket sub information are stored on each other lottery ticket printing terminal and each copy of the first encrypted lottery ticket sub information is stored on at least two other lottery ticket printing terminals.
It can be known from the above description that each piece of the first encrypted lottery ticket information is at least stored in two other lottery ticket printing ends, so as to play a backup role, and avoid the problem of complete lottery ticket information loss caused by damage of a local lottery ticket printing end.
Further, a lottery ticket verifying terminal is included, the lottery ticket verifying terminal includes a third memory, a third processor and a third computer program stored in the third memory and operable on the third processor, after the step S3, the third processor executes the third computer program to implement the following steps:
s4, sending the identified second user identification information, second ticket paper serial number information of the printed surface of the lottery to be verified, second betting information and second lottery site selling information of the hot-printed surface of the lottery to be verified, and second circulation identification information and second encrypted lottery sub-information which are obtained from the RFID label of the lottery to be verified as second lottery safety information to a lottery service end for verification;
after the step S4, the second processor, when executing the second computer program, further implements the following steps:
s5, receiving and judging whether the second circulation identification information exists, if so, obtaining whether the betting information and the user identification information bound when the lottery is printed according to the second circulation identification information are respectively the same as the second betting information and the second user identification information, if so, obtaining the terminal unique identification corresponding to the second lottery storage information bound when the lottery is printed by the second circulation identification information, and returning the terminal unique identification corresponding to the second lottery storage information to a lottery verification end;
after the step S5, the third processor, when executing the third computer program, further implements the steps of:
s6, receiving the terminal unique identifier corresponding to the second lottery storage information, acquiring other second encrypted lottery sub-information from the lottery printing end corresponding to each terminal unique identifier corresponding to the second lottery storage information according to the second circulation identifier information, judging whether the second encrypted lottery sub-information with the same sequencing information is the same, if so, acquiring the second encrypted lottery sub-information corresponding to each sequencing information, forming second encrypted lottery information according to the sequence relation of the sequencing information, and returning the second circulation identifier information and the second encrypted lottery information to the lottery service end;
after the step S6, the second processor, when executing the second computer program, further implements the following steps:
s7, the second circulation identification information and the second encrypted lottery information are received, the second encrypted lottery information is decrypted to obtain legal lottery security information, the legal ticket paper serial number information, the legal betting information, the legal user identification information and the legal lottery site selling information in the legal lottery security information are respectively subjected to consistency comparison with the second ticket paper serial number information, the second betting information, the second user identification information and the second lottery site selling information in the second lottery security information, if all the comparisons are successful, the verification result of the lottery to be verified is a true ticket, if one inconsistency exists, the verification result of the lottery to be verified is a false ticket, and the verification result is returned to a lottery verification end.
As can be seen from the above description, on the premise of storing multiple copies of encrypted lottery ticket sub-information, the encrypted lottery ticket sub-information of the same ordering information stored by different lottery ticket printing terminals should be the same, so that identity verification is performed on the encrypted lottery ticket sub-information first, if the encrypted lottery ticket sub-information is different, it indicates that there is a security risk, and if the encrypted lottery ticket sub-information is the same, all the obtained encrypted lottery ticket sub-information are combined into complete encrypted lottery ticket information for decryption verification, thereby further improving security of the lottery ticket.
Further, in the step S22, the lottery service end also randomly generates N random numbers with different lengths, where the sum of the N random numbers with different lengths is equal to the length of the first encrypted lottery information;
the lottery service end in the step S23 further returns the N random numbers with the length to the current lottery printing end;
the step S31 specifically includes the following steps: the current lottery printing end acquires N, N random numbers with the length, unique terminal identifiers of the N-1 other lottery printing ends and the first encrypted lottery information, divides the first encrypted lottery information into N pieces of first encrypted lottery sub information according to the N random numbers with the length, and records the sequencing information of each piece of the first encrypted lottery sub information;
in step S34, the first lottery ticket storage information further includes a length random number corresponding to the first encrypted lottery ticket sub information stored by the current lottery ticket printing terminal;
in the step S35, the lottery service end further stores the length random number in association with the second encrypted lottery ticket information to be verified in the subsequent verification, so as to verify the length of the second encrypted lottery ticket information in bytes.
As can be seen from the above description, on one hand, the byte lengths of the divided pieces of the first encrypted lottery ticket sub-information are randomly generated, that is, different from each other, thereby increasing the counterfeiting difficulty, and on the other hand, when the encrypted lottery ticket sub-information is subsequently obtained, the byte length is verified, so that the validity of the encrypted lottery ticket sub-information can be verified, and when a security risk exists, which data of the lottery ticket printing end has a problem can be known, thereby timely obtaining the security risk and improving the security of the lottery ticket.
Referring to fig. 1, a first embodiment of the present invention is:
the lottery anti-counterfeiting method based on the RFID label comprises the following steps:
s1, the current lottery printing end acquires first lottery serial number information of a printing surface of a prefabricated lottery, and the first lottery serial number information, the first betting information to be printed on a hot printing surface, the first user identity information for purchasing the lottery and the first lottery site selling information corresponding to the current lottery printing end are used as first lottery safety information and sent to the lottery service end;
s2, the lottery service end receives and encrypts the first lottery security information to obtain first encrypted lottery information, and the first encrypted lottery information is returned to the current lottery printing end;
in this embodiment, the first encrypted lottery information is generated by the lottery server and sent to the RFID tag of the pre-manufactured lottery, and for the current lottery printing terminal, a basis for accurately determining whether the data source is a legal lottery server is required, so that the lottery server returns the first encrypted lottery information and the server security identification information of the lottery server to the current lottery printing terminal in step S2.
And S3, the current lottery ticket printing end writes the first encrypted lottery ticket information into the RFID label of the prefabricated lottery ticket, and prints the first betting information on the hot printing surface of the prefabricated lottery ticket to obtain the betted lottery ticket.
In this embodiment, the current lottery printing terminal verifies the security identification information of the server, and if the verification is successful, the first encrypted lottery information is written into the RFID tag of the pre-made lottery, and the first betting information is printed on the hot printing surface of the pre-made lottery, so as to obtain the betted lottery.
The lottery service end also obtains the current encryption time stamp in step S2, so that the lottery service end first verifies whether the first lottery security information and the current encryption time stamp are unique in step S2, encrypts the first lottery security information to obtain first encrypted lottery information, encrypts the current encryption time stamp to obtain encrypted time information, and returns the first encrypted lottery information and the encrypted time information to the current lottery printing end.
At this time, when the first encrypted lottery ticket information is written in the RFID tag of the pre-lottery ticket in step S3, the specific steps are: the RFID tag decrypts the encrypted time information through a built-in decryption algorithm to obtain a current encryption time stamp of the server side encrypted first lottery ticket safety information, compares the current encryption time stamp with a real-time stamp of the received first encrypted lottery ticket information, writes the first encrypted lottery ticket information if the current encryption time stamp is within a preset time error range, and abandons the writing if the current encryption time stamp is not within the preset time error range.
Wherein the encryption algorithm used to encrypt the current encryption timestamp is different from the encryption algorithm used to encrypt the first lottery security information. As for the preset time error range, the time can be selected from 1 second to 1 hour according to the actual selection, which is the time reserved for the data to reach the RFID tag from the server, and the time can be reasonably set according to the data transmission performance.
In this way, when a lawbreaker prints the lottery ticket for the user, the lawbreaker does not print the lottery ticket directly, but prints the printing information stored in the lottery ticket as the first time on the ticket surface after the winning result appears, and the printing information is used as a prize exchanging certificate; and based on the timestamp information, the error range of the preset time is exceeded, information is not input, and therefore the additional printing cannot be finished.
Meanwhile, for the RFID label, after a piece of first encrypted lottery information is written, the writing function is destroyed, only the reading function is reserved, and the condition that illegal persons modify the stored lottery information to falsify a prize after drawing a prize is avoided.
Referring to fig. 1, the second embodiment of the present invention is:
in this embodiment, in step S1, the first lottery website selling information includes a terminal unique identifier of the current lottery printing end and first unique selling serial number information of the current lottery printing end, and the first lottery paper serial number information and the first unique selling serial number information are used as first circulation identifier information;
step S2 specifically includes the following steps:
s21, the lottery service end receives and encrypts the first lottery security information to obtain first encrypted lottery information;
s22, the lottery service side randomly generates a random number N within 1-M, randomly selects N-1 lottery sites, and obtains terminal unique identifiers of other lottery printing ends in each lottery site to obtain N-1 terminal unique identifiers, wherein M is the number of current lottery printing ends in a preset range;
s23, the lottery service end returns the unique terminal identification of the random number N, N-1 other lottery printing ends and the first encrypted lottery information to the current lottery printing end;
step S3 specifically includes the following steps:
s31, the current lottery printing end acquires unique terminal identifiers of other lottery printing ends with a random number of N, N-1 and first encrypted lottery information, randomly divides the first encrypted lottery information into N pieces of first encrypted lottery sub information, and records the sequencing information of each piece of first encrypted lottery sub information;
s32, storing at least one piece of first encrypted lottery ticket sub information by the current lottery ticket printing end, writing the first circulation identification information and the stored first encrypted lottery ticket sub information into the RFID label of the prefabricated lottery ticket, and printing first betting information on the hot printing surface to obtain a betted lottery ticket;
because the current lottery printing end only stores incomplete encrypted lottery information, even if the encrypted lottery information is illegally obtained, the encrypted lottery information cannot be cracked to obtain any information, and the data in the encrypted lottery printing end cannot be illegally modified to forge a prize.
The method for storing at least one piece of first encrypted lottery ticket information at the current lottery ticket printing end specifically comprises the following steps: the current lottery printing end stores at least two pieces of first encrypted lottery sub information;
s33, the current lottery printing end randomly distributes the rest N-1 parts of first encrypted lottery sub information attached with the first circulation identification information and the corresponding sequencing information to N-1 other lottery printing ends corresponding to the unique identifications of the N-1 terminals, so that at least one part of first encrypted lottery sub information is stored in each other lottery printing end;
wherein, the step of storing at least one first encrypted lottery ticket information on each other lottery ticket printing terminal specifically comprises the following steps: so that at least two copies of the first encrypted lottery ticket sub information are stored on each other lottery ticket printing terminal and each copy of the first encrypted lottery ticket sub information is stored on at least two other lottery ticket printing terminals.
Therefore, even if the stored information of the RFID label is modified, the sub-information of each piece of the first encrypted lottery ticket in the RFID label is inconsistent with the sub-information of other lottery tickets printed on other lottery tickets, and the authenticity of the lottery tickets can be identified.
S34, the current lottery printing end records the binding relationship between the terminal unique identifier of each other lottery printing end and the stored ordering information corresponding to the first encrypted lottery sub-information to obtain first lottery storage information, and the first encrypted lottery information and the first lottery storage information are returned to the lottery service end;
s35, the lottery service end receives the first encrypted lottery information and the first lottery storage information, deletes the stored first encrypted lottery information, and associates and stores the first circulation identification information, the first lottery storage information, the first betting information, and the first user identification information.
Therefore, when the authenticity verification of the lottery ticket is performed subsequently, i.e. after step S3, the method further includes the following steps:
s4, the lottery ticket verifying end sends the identified second user identity identification information, the second ticket paper serial number information of the printing surface of the lottery ticket to be verified, the second betting information and the second lottery ticket site selling information of the hot printing surface of the lottery ticket to be verified, and the second circulation identification information and the second encrypted lottery ticket information which are obtained from the RFID label of the lottery ticket to be verified as second lottery ticket safety information to the lottery ticket server end for verification;
s5, the lottery service end receives and judges whether second circulation identification information exists, if yes, betting information and user identification information which are bound when the lottery is printed are obtained according to the second circulation identification information and are respectively the same as the second betting information and the second user identification information, if yes, a terminal unique identification which corresponds to second lottery storage information which is bound when the lottery is printed by the second circulation identification information is obtained, and the terminal unique identification which corresponds to the second lottery storage information is returned to the lottery verification end;
s6, the lottery verifying terminal receives the terminal unique identifier corresponding to the second lottery storage information, acquires other second encrypted lottery sub-information from the lottery printing terminal corresponding to each terminal unique identifier corresponding to the second lottery storage information according to the second circulation identifier information, judges whether the second encrypted lottery sub-information with the same sequencing information is the same, acquires the second encrypted lottery sub-information corresponding to each sequencing information if the second encrypted lottery sub-information with the same sequencing information is the same, forms second encrypted lottery information according to the sequence relation of the sequencing information, and returns the second circulation identifier information and the second encrypted lottery information to the lottery service terminal;
s7, the lottery service end receives the second circulation identification information and the second encrypted lottery information, decrypts the second encrypted lottery information to obtain legal lottery security information, respectively carries out consistency comparison on legal lottery serial number information, legal betting information, legal user identification information and legal lottery site selling information in the legal lottery security information and the second lottery serial number information, the second betting information, the second user identification information and the second lottery site selling information in the second lottery security information, if all the comparison is successful, the verification result of the lottery to be verified is a true lottery, if one is inconsistent, the verification result of the lottery to be verified is a false lottery, and the verification result is returned to the lottery verification end.
Therefore, the result of the verification is false ticket, which does not indicate that the lottery ticket is forged, and the user identification may be inconsistent, which is fake. Therefore, the result of the verification here is that the verification is not more appropriate.
Referring to fig. 1, a third embodiment of the present invention is:
in the lottery anti-counterfeiting method based on the RFID tag, in this embodiment, in step S22, the lottery service end further randomly generates N random numbers with different lengths, where the sum of the N random numbers with different lengths is equal to the length of the first encrypted lottery information;
the lottery service end in the step S23 returns the N random numbers with the lengths to the current lottery printing end;
step S31 specifically includes the following steps: the method comprises the steps that a current lottery printing end obtains N, N random numbers with length, unique terminal identifiers of N-1 other lottery printing ends and first encrypted lottery information, the first encrypted lottery information is divided into N pieces of first encrypted lottery sub information according to the N random numbers with length, and sequencing information of each piece of the first encrypted lottery sub information is recorded;
in step S34, the first lottery ticket storage information further includes a length random number corresponding to the first encrypted lottery ticket sub information stored by the current lottery ticket printing terminal;
in step S35, the lottery service end further stores a length random number in association with the second encrypted lottery ticket information to be verified in the subsequent verification, so as to verify the length of the second encrypted lottery ticket information in bytes.
Referring to fig. 2, a fourth embodiment of the present invention is:
the lottery anti-counterfeiting system 1 based on the RFID tag comprises a current lottery printing end 2 and a lottery service end 5, wherein the current lottery printing end 2 comprises a first memory 4, a first processor 3 and a first computer program which is stored on the first memory 4 and can run on the first processor 3, the lottery service end 5 comprises a second memory 7, a second processor 6 and a second computer program which is stored on the second memory 7 and can run on the second processor 6, the first processor 3 realizes the steps of the first to third embodiments with the current lottery printing end as an execution main body when executing the first computer program, and the second processor 6 realizes the steps of the first to third embodiments with the lottery service end 5 as an execution main body when executing the first computer program.
In summary, the RFID tag-based lottery anti-counterfeiting method and system provided by the present invention, through the specific implementation of the method and the terminal, not only can more encryption algorithms be adopted and more verification information be stored, but also illegal actions such as illegal modification of lottery data by illegal parties, additional lottery making in winning a prize without ticket drawing in advance, or lottery making by lottery ticket counterfeiting through obtaining complete lottery information by a lottery service end can be avoided, thereby providing an anti-counterfeiting lottery mechanism with higher security performance.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.
Claims (10)
1. The lottery anti-counterfeiting method based on the RFID label is characterized by comprising the following steps:
s1, the current lottery printing end acquires first lottery serial number information of a printing surface of a prefabricated lottery, and the first lottery serial number information, the first betting information to be printed on a hot printing surface, the first user identification information for purchasing a lottery and the first lottery site selling information corresponding to the current lottery printing end are used as first lottery safety information and sent to a lottery service end;
s2, the lottery service end receives and encrypts the first lottery security information to obtain first encrypted lottery information, and the first encrypted lottery information is returned to the current lottery printing end;
and S3, the current lottery ticket printing end writes the first encrypted lottery ticket information into the RFID label of the prefabricated lottery ticket, and prints the first betting information on the hot printing surface of the prefabricated lottery ticket to obtain the betted lottery ticket.
2. The RFID tag-based lottery anti-counterfeiting method according to claim 1, wherein the first lottery site sales information in step S1 includes a terminal unique identifier of the current lottery printing terminal and first unique sales serial number information of the current lottery printing terminal, and the first lottery paper serial number information and the first unique sales serial number information are used as first circulation identification information;
the step S2 specifically includes the following steps:
s21, the lottery service end receives and encrypts the first lottery security information to obtain first encrypted lottery information;
s22, the lottery service side randomly generates a random number N within 1-M, randomly selects N-1 lottery sites, and obtains terminal unique identifiers of other lottery printing ends in each lottery site to obtain N-1 terminal unique identifiers, wherein M is the number of current lottery printing ends in a preset range;
s23, the lottery service end returns the terminal unique identification of the other lottery printing ends with the random number N, N-1 and the first encrypted lottery information to the current lottery printing end;
the step S3 specifically includes the following steps:
s31, the current lottery printing end acquires the random number N, the terminal unique identifiers of the N-1 other lottery printing ends and the first encrypted lottery information, randomly divides the first encrypted lottery information into N pieces of first encrypted lottery sub information, and records the sequencing information of each piece of first encrypted lottery sub information;
s32, storing at least one piece of first encrypted lottery ticket sub information by the current lottery ticket printing end, writing the first circulation identification information and the stored first encrypted lottery ticket sub information into the RFID label of the prefabricated lottery ticket, and printing first betting information on the hot printing surface to obtain a betted lottery ticket;
s33, the current lottery ticket printing end randomly distributes the rest N-1 parts of the first encrypted lottery ticket sub information attached with the first circulation identification information and the corresponding sequencing information to N-1 other lottery ticket printing ends corresponding to the unique identifications of the N-1 terminals, so that at least one part of the first encrypted lottery ticket sub information is stored in each other lottery ticket printing end;
s34, the current lottery printing end records the binding relationship between the terminal unique identifier of each other lottery printing end and the stored ordering information corresponding to the first encrypted lottery sub-information to obtain first lottery storage information, and returns the first encrypted lottery information and the first lottery storage information to the lottery service end;
s35, the lottery service end receives the first encrypted lottery information and the first lottery storage information, deletes the stored first encrypted lottery information, and associates and stores the first circulation identification information, the first lottery storage information, the first bet information and the first user identification information.
3. The RFID tag-based lottery anti-counterfeiting method according to claim 2, wherein the step S32 of storing at least one piece of the first encrypted lottery ticket information by the current lottery printing terminal specifically comprises: the current lottery printing end stores at least two copies of the first encrypted lottery sub-information;
in the step S33, the step of storing at least one piece of the first encrypted lottery ticket information on each of the other lottery ticket printing terminals specifically includes: so that at least two copies of the first encrypted lottery ticket sub information are stored on each other lottery ticket printing terminal and each copy of the first encrypted lottery ticket sub information is stored on at least two other lottery ticket printing terminals.
4. The RFID tag-based lottery anti-counterfeiting method according to claim 2 or 3, further comprising the following steps after the step S3:
s4, the lottery ticket verifying end sends the identified second user identity identification information, second ticket paper serial number information of the printing surface of the lottery ticket to be verified, second betting information and second lottery ticket site selling information of the hot printing surface of the lottery ticket to be verified, and second circulation identification information and second encrypted lottery ticket information which are obtained from the RFID label of the lottery ticket to be verified to the lottery ticket server end as second lottery ticket safety information for verification;
s5, the lottery service end receives and judges whether the second circulation identification information exists, if yes, the betting information and the user identification information which are bound when the lottery is printed are obtained according to the second circulation identification information and are respectively the same as the second betting information and the second user identification information, if yes, the terminal unique identification which is corresponding to the second lottery storage information which is bound when the lottery is printed by the second circulation identification information is obtained, and the terminal unique identification which is corresponding to the second lottery storage information is returned to the lottery verification end;
s6, the lottery verifying terminal receives the terminal unique identifier corresponding to the second lottery storage information, acquires other second encrypted lottery sub-information from the lottery printing terminal corresponding to each terminal unique identifier corresponding to the second lottery storage information according to the second circulation identifier information, judges whether the second encrypted lottery sub-information with the same sequencing information is the same, if the judgment results are the same, acquires the second encrypted lottery sub-information corresponding to each sequencing information, forms second encrypted lottery information according to the sequence relation of the sequencing information, and returns the second circulation identifier information and the second encrypted lottery information to the lottery service terminal;
s7, the lottery service end receives the second circulation identification information and the second encrypted lottery information, decrypts the second encrypted lottery information to obtain legal lottery security information, respectively performs consistency comparison on legal ticket paper serial number information, legal betting information, legal user identification information and legal lottery site selling information in the legal lottery security information and the second ticket paper serial number information, the second betting information, the second user identification information and the second lottery site selling information in the second lottery security information, if all the comparison is successful, the verification result of the lottery to be verified is a true ticket, if one is inconsistent, the verification result of the lottery to be verified is a false ticket, and returns the verification result to the lottery verification end.
5. The RFID tag-based lottery anti-counterfeiting method according to claim 3, wherein the lottery server randomly generates N random numbers with different lengths from each other in the step S22, wherein the sum of the N random numbers with different lengths is equal to the length of the first encrypted lottery information;
the lottery service end in the step S23 further returns the N random numbers with the length to the current lottery printing end;
the step S31 specifically includes the following steps: the current lottery printing end acquires N, N random numbers with the length, unique terminal identifiers of the N-1 other lottery printing ends and the first encrypted lottery information, divides the first encrypted lottery information into N pieces of first encrypted lottery sub information according to the N random numbers with the length, and records the sequencing information of each piece of the first encrypted lottery sub information;
in step S34, the first lottery ticket storage information further includes a length random number corresponding to the first encrypted lottery ticket sub information stored by the current lottery ticket printing terminal;
in the step S35, the lottery service end further stores the length random number in association with the second encrypted lottery ticket information to be verified in the subsequent verification, so as to verify the length of the second encrypted lottery ticket information in bytes.
6. The lottery anti-counterfeiting system based on the RFID label comprises a current lottery printing end and a lottery service end, wherein the current lottery printing end comprises a first memory, a first processor and a first computer program which is stored on the first memory and can run on the first processor, the lottery service end comprises a second memory, a second processor and a second computer program which is stored on the second memory and can run on the second processor, and the lottery anti-counterfeiting system is characterized in that the first processor executes the first computer program to realize the following steps:
s1, acquiring first ticket paper serial number information of a printed surface of a prefabricated lottery ticket, and sending the first ticket paper serial number information, first betting information to be printed on a hot-printed surface, first user identity information for purchasing the lottery ticket and first lottery ticket site selling information corresponding to the current lottery ticket printing end as first lottery ticket safety information to a lottery ticket server end;
the second processor, when executing the second computer program, implements the steps of:
s2, receiving and encrypting the first lottery security information to obtain first encrypted lottery information, and returning the first encrypted lottery information to the current lottery printing end;
the first processor, when executing the first computer program, implements the steps of:
and S3, writing the first encrypted lottery ticket information into the RFID label of the prefabricated lottery ticket, and printing first betting information on the hot printing surface of the prefabricated lottery ticket to obtain a bet lottery ticket.
7. The RFID tag-based lottery anti-counterfeiting system according to claim 6, wherein the first lottery site sales information in step S1 includes a terminal unique identifier of the current lottery printing terminal and first unique sales serial number information of the current lottery printing terminal, and the first lottery paper serial number information and the first unique sales serial number information are used as first circulation identification information;
the step S2 specifically includes the following steps:
s21, receiving and encrypting the first lottery ticket security information to obtain first encrypted lottery ticket information;
s22, randomly generating a random number N within 1-M, randomly selecting N-1 lottery sites, and acquiring terminal unique identifiers of other lottery printing ends in each lottery site to obtain N-1 terminal unique identifiers, wherein M is the number of current lottery printing ends in a preset range;
s23, returning the terminal unique identifiers of the N, N-1 random numbers of the other lottery printing terminals and the first encrypted lottery information to the current lottery printing terminal;
the step S3 specifically includes the following steps:
s31, acquiring the random number N, the terminal unique identification of the N-1 other lottery printing terminals and the first encrypted lottery information, randomly dividing the first encrypted lottery information into N pieces of first encrypted lottery sub-information, and recording the sequencing information of each piece of the first encrypted lottery sub-information;
s32, storing at least one piece of the first encrypted lottery ticket sub information, writing the first circulation identification information and the stored first encrypted lottery ticket sub information into the RFID label of the prefabricated lottery ticket, and printing first betting information on a hot printing surface to obtain a betted lottery ticket;
s33, randomly distributing the rest N-1 parts of the first encrypted lottery ticket sub information with the first circulation identification information and the corresponding sequencing information to N-1 other lottery ticket printing terminals corresponding to the unique identifications of the N-1 terminals, so that at least one part of the first encrypted lottery ticket sub information is stored in each other lottery ticket printing terminal;
s34, recording the binding relationship between the terminal unique identifier of each other lottery printing terminal and the stored ordering information corresponding to the first encrypted lottery sub-information to obtain first lottery storage information, and returning the first encrypted lottery information and the first lottery storage information to a lottery service terminal;
s35, receiving the first encrypted lottery information and the first lottery storage information, deleting the stored first encrypted lottery information, and associating and storing the first circulation identification information, the first lottery storage information, the first bet information, and the first user identification information.
8. The RFID tag-based lottery anti-counterfeiting system according to claim 7, wherein the step S32 of storing at least one piece of the first encrypted lottery ticket information includes: storing at least two copies of the first encrypted lottery ticket sub-information;
in the step S33, the step of storing at least one piece of the first encrypted lottery ticket information on each of the other lottery ticket printing terminals specifically includes: so that at least two copies of the first encrypted lottery ticket sub information are stored on each other lottery ticket printing terminal and each copy of the first encrypted lottery ticket sub information is stored on at least two other lottery ticket printing terminals.
9. The RFID tag-based lottery anti-counterfeiting system according to claim 7 or 8, further comprising a lottery authentication terminal comprising a third memory, a third processor and a third computer program stored in the third memory and operable on the third processor, wherein after the step S3, the third processor executes the third computer program to realize the following steps:
s4, sending the identified second user identification information, second ticket paper serial number information of the printed surface of the lottery to be verified, second betting information and second lottery site selling information of the hot-printed surface of the lottery to be verified, and second circulation identification information and second encrypted lottery sub-information which are obtained from the RFID label of the lottery to be verified as second lottery safety information to a lottery service end for verification;
after the step S4, the second processor, when executing the second computer program, further implements the following steps:
s5, receiving and judging whether the second circulation identification information exists, if so, obtaining whether the betting information and the user identification information bound when the lottery is printed according to the second circulation identification information are respectively the same as the second betting information and the second user identification information, if so, obtaining the terminal unique identification corresponding to the second lottery storage information bound when the lottery is printed by the second circulation identification information, and returning the terminal unique identification corresponding to the second lottery storage information to a lottery verification end;
after the step S5, the third processor, when executing the third computer program, further implements the steps of:
s6, receiving the terminal unique identifier corresponding to the second lottery storage information, acquiring other second encrypted lottery sub-information from the lottery printing end corresponding to each terminal unique identifier corresponding to the second lottery storage information according to the second circulation identifier information, judging whether the second encrypted lottery sub-information with the same sequencing information is the same, if so, acquiring the second encrypted lottery sub-information corresponding to each sequencing information, forming second encrypted lottery information according to the sequence relation of the sequencing information, and returning the second circulation identifier information and the second encrypted lottery information to the lottery service end;
after the step S6, the second processor, when executing the second computer program, further implements the following steps:
s7, the second circulation identification information and the second encrypted lottery information are received, the second encrypted lottery information is decrypted to obtain legal lottery security information, the legal ticket paper serial number information, the legal betting information, the legal user identification information and the legal lottery site selling information in the legal lottery security information are respectively subjected to consistency comparison with the second ticket paper serial number information, the second betting information, the second user identification information and the second lottery site selling information in the second lottery security information, if all the comparisons are successful, the verification result of the lottery to be verified is a true ticket, if one inconsistency exists, the verification result of the lottery to be verified is a false ticket, and the verification result is returned to a lottery verification end.
10. The RFID tag-based lottery anti-counterfeiting system according to claim 8, wherein the lottery server randomly generates N random numbers with different lengths from each other in the step S22, wherein the sum of the N random numbers with different lengths is equal to the length of the first encrypted lottery information;
the lottery service end in the step S23 further returns the N random numbers with the length to the current lottery printing end;
the step S31 specifically includes the following steps: the current lottery printing end acquires N, N random numbers with the length, unique terminal identifiers of the N-1 other lottery printing ends and the first encrypted lottery information, divides the first encrypted lottery information into N pieces of first encrypted lottery sub information according to the N random numbers with the length, and records the sequencing information of each piece of the first encrypted lottery sub information;
in step S34, the first lottery ticket storage information further includes a length random number corresponding to the first encrypted lottery ticket sub information stored by the current lottery ticket printing terminal;
in the step S35, the lottery service end further stores the length random number in association with the second encrypted lottery ticket information to be verified in the subsequent verification, so as to verify the length of the second encrypted lottery ticket information in bytes.
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