CN112260998B - Method and device for protecting answers of network questions - Google Patents
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- CN112260998B CN112260998B CN202011009893.8A CN202011009893A CN112260998B CN 112260998 B CN112260998 B CN 112260998B CN 202011009893 A CN202011009893 A CN 202011009893A CN 112260998 B CN112260998 B CN 112260998B
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Abstract
The invention relates to a method and a device for protecting answers of network questions, belongs to the technical field of network security, and solves the problem that answers of existing network questions are cracked due to the fact that secret keys are possibly leaked. The answer protection method for the network topic comprises the following steps: converting the network questions into a set of numerical values with a binary digit system through a server; calculating the numerical value of the group of digit system by a convention algorithm to obtain a first result value; confusing partial digits of the first result value with digit system numerical values corresponding to correct answers to obtain answer calculation values, wherein the digit systems of the network questions are consistent with the digit systems of the correct answers; and taking the answer calculation value as an answer and transmitting the answer and the network topic to a client. By confusing the answers, a person who cracks the answers can mistakenly think that the correct answers are obtained, and the correct answers are confused, so that the data security of the correct answers is protected.
Description
Technical Field
The invention relates to the technical field of network security, in particular to a method and a device for protecting answers of network questions.
Background
The online examination refers to an examination form in which the whole process of the examination is performed on the network by operating a computer, and the online examination is separated from a paper medium and can also be called as the examination performed through a network medium. The on-line examination is a paperless examination system developed by a campus network, and comprises a computer-covered class examination, a college English examination, a student admission examination, a professional class examination, a financial class examination, an engineering class examination, a foreign trade class examination, a special book, a policeman examination and the like.
The data of questions and answers related to the existing online examination and the like needs to have high security. The ciphertext is a converted character, presents a garbled character, cannot be used for directly reading data to understand the meaning of the data, and can be decrypted to know the meaning of the data. Data is typically transmitted after being encrypted into a secret, but the answer is cracked because the key may be compromised.
Disclosure of Invention
In view of the foregoing analysis, embodiments of the present invention are directed to a method and an apparatus for protecting answers to network questions, so as to solve the problem that answers to existing network questions are cracked due to possible leakage of a secret key.
In one aspect, an embodiment of the present invention provides an answer protection method for a network topic, including: converting the network title into a numerical value of a group of digit system through a server; calculating the numerical value of the group of digit system by a convention algorithm to obtain a first result value; confusing partial digits of the first result value with digit system numerical values corresponding to correct answers to obtain answer calculation values, wherein the digit systems of the network questions are consistent with the digit systems of the correct answers; and taking the answer calculation value as an answer and transmitting the answer and the network topic to a client.
The beneficial effects of the above technical scheme are as follows: the answer is confused by the answer protection method for the network questions provided by the embodiment of the invention, so that a person who cracks the answer can mistakenly think that the correct answer is obtained, and the correct answer is confused, thereby protecting the data security of the correct answer.
In a further development of the above method, the set of binary values comprises a set of four-bit values or a set of two-bit values.
Based on the further improvement of the method, the step of calculating the numerical value of the set of the binary system by using a convention algorithm further comprises the following steps: carrying out addition calculation on the numerical values of the group of four-digit system through convention addition; or exclusive-ORing partial bits of each value in a group of binary values by a conventional exclusive-OR algorithm.
Based on a further improvement of the above method, the obfuscating the partial digits of the first result value and the digit scale value corresponding to the correct answer includes: when the partial digit of the calculation result value is 0 and the correct answer is D, the confusion calculation is that the digit number value corresponding to the correct answer D is reduced by 1; when the partial digit of the calculation result value is 0 and the correct answer is A, the confusion calculation is that the digit number corresponding to the correct answer A is self-added by 1; and when the part of digits of the calculation result value are not 0, subtracting the digit system numerical value corresponding to the correct answer from the part of digits of the first result value, and taking the absolute value of the subtraction as the answer calculation value or performing exclusive-or calculation on the part of digits of the first result value and the corresponding part of digits of the digit system numerical value corresponding to the correct answer.
Based on a further improvement of the above method, transmitting the answer calculation value to the client further comprises: encrypting the answer calculation value and transmitting the encrypted answer calculation value to the client; or transmitting the answer calculation value to the client in a plaintext mode.
Based on the further improvement of the method, when the client is a data interceptor, the data interceptor directly obtains the answer calculation value as an answer in a plaintext manner; or the data interception party decrypts the encrypted answer calculation value based on a secret key and obtains the answer calculation value as an answer.
Based on further improvement of the method, when the client is a target client, the client receives the answer calculation value and the network title from the server; converting the received network title into a group of numerical values with a binary digit system; calculating the numerical value of the group of digit system by a convention algorithm to obtain a second result value; and performing anti-confusion processing on the received answer calculation value and the second result value to obtain a correct answer.
Based on the further improvement of the above method, before the target client receives the answer calculation value and the network topic, the method further includes: the target client stores the preset algorithm and an anti-confusion processing rule corresponding to the confusion processing in advance, when the target client receives the encrypted answer calculation value, the target client stores a private key in advance, and decrypts the encrypted answer calculation value through the private key to obtain the answer calculation value.
Based on a further improvement of the above method, the anti-obfuscating the received answer calculation value and the second result value further includes: antialiasing the received answer calculation value with the second result value further comprises: when the confusion calculation is that the digit numerical value corresponding to the correct answer D is self-reduced by 1, the anti-confusion processing rule is that the received answer calculation value is self-increased by 1; when the confusion calculation is that the digit numerical value corresponding to the correct answer A is self-added by 1, the anti-confusion processing rule is that the received answer calculation value is self-subtracted by 1; when the confusion calculation is the subtraction operation of partial digits of the first result value and the digit binary value corresponding to the correct answer, the anti-confusion processing rule is to add the second result value and the received answer calculation value; or when the partial digits of the first result value and the corresponding partial digits of the digit scale value corresponding to the correct answer are subjected to exclusive-or calculation, the partial digits of the second result value and the received answer calculation value are subjected to exclusive-or calculation.
On the other hand, an embodiment of the present invention provides an answer protection device for a network topic, including: the network topic conversion module is used for converting the network topic into a group of numerical values with a binary digit system through a server; the first result value acquisition module is used for calculating the numerical value of the group of digit system through a convention algorithm to obtain a first result value; a confusion processing module, configured to perform confusion processing on a part of digits of the first result value and a digit system numerical value corresponding to a correct answer to obtain an answer calculation value, where the digit system of the network question is consistent with the digit system of the correct answer; and the sending module is used for taking the answer calculation value as an answer and transmitting the answer and the network title to a client.
Compared with the prior art, the invention can realize at least one of the following beneficial effects:
1. the answer data is obfuscated by the answer protection method of the network topic provided by the invention, and the answer for obfuscating is sent in a plaintext or ciphertext mode;
2. when the data interceptor cracks the answer of the confusion processing according to the stolen private key, the data interceptor mistakenly regards to obtain the correct answer and confuses the correct answer, thereby protecting the data security of the correct answer; and
3. the target client can obtain correct answers through simple processing according to a pre-stored preset algorithm, confusion processing and a private key, so that the normal use of the target client cannot be influenced.
In the invention, the technical schemes can be combined with each other to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.
FIG. 1 is a flowchart of an answer protection method for network topics according to an embodiment of the present invention;
FIG. 2 is a block diagram illustrating a method for protecting answers to network topics according to an embodiment of the present invention; and
fig. 3 is a block diagram of an answer protection device for network topics according to an embodiment of the present invention.
Reference numerals:
302-network topic conversion module; 304-a first result value obtaining module; 306-an obfuscation processing module; and 308-a transmission module
Detailed Description
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate preferred embodiments of the invention and, together with a description of the invention, serve to explain the principles of the invention and not to limit the scope of the invention.
The invention discloses an answer protection method for network topics. As shown in fig. 1, the answer protection method for a network topic includes: step S102, converting the network title into a group of numerical values of a digit system through a server; step S104, calculating a numerical value of a group of digit system through a convention algorithm to obtain a first result value; step S106, mixing up partial digits of the first result value and digit system numerical values corresponding to the correct answers to obtain answer calculation values, wherein the digit systems of the network questions are consistent with the digit systems of the correct answers; and step S108, the answer calculation value is used as an answer, and the answer and the network title are transmitted to the client.
Compared with the prior art, the answer protection method for the network questions provided by the embodiment is used for confusing answer data, so that a person who cracks the answers can mistakenly think that the correct answers are obtained, and the correct answers are confused, thereby protecting the data security of the correct answers.
Hereinafter, the answer protection method for the network topic will be described in detail with reference to fig. 1 and 2.
The answer protection method for the network topic comprises the following steps: and S102, converting the network title into a group of numerical values of a digit system through the server. Specifically, the set of binary values includes a set of four-binary values or a set of two-binary values. Optionally, the set of numeric values in a decimal place may also include a set of numeric values in other decimal places according to the user's needs, for example, when the answer is 5 answers or 6 answers or the like other than four answers, the set of numeric values in a decimal place is a set of numeric values in a quinary place or a set of numeric values in a sextic place.
After converting the network topic into a set of numerical values in a digit system, the method proceeds to step S104, and the numerical values in the set of digit system are calculated by a convention algorithm to obtain a first result value. Specifically, calculating the numerical value of the set of binary digits by the convention algorithm further comprises: carrying out addition calculation on a group of numerical values of a four-digit system through convention addition; or exclusive-ORing a part of bits of each value in a group of binary values by a conventional exclusive-OR algorithm.
After the numerical values of the set of digit systems are calculated by the convention algorithm, step S106 is performed, and a part of digits of the first result value and the numerical values of the digit systems corresponding to the correct answers are subjected to confusion processing to obtain answer calculation values, wherein the digit systems of the network questions are consistent with the digit systems of the correct answers. Specifically, the obfuscating a partial digit of the first result value and a digit scale value corresponding to the correct answer includes: when the part digit of the calculation result value is 0 and the correct answer is D, the confusion calculation is that the digit number value corresponding to the correct answer D is reduced by 1; when the number of partial digits of the calculation result value is 0 and the correct answer is A, the confusion calculation is that the digit number value corresponding to the correct answer A is self-added with 1; and when the part digit of the calculation result value is not 0, performing confusion calculation by subtracting the part digit of the first result value and the digit scale numerical value corresponding to the correct answer and using the absolute value of the subtraction operation as an answer calculation value or performing exclusive-or calculation on the part digit of the first result value and the corresponding part digit number of the digit scale numerical value corresponding to the correct answer.
After obtaining the answer calculation value, step S108 is entered, and the answer calculation value is used as an answer and the network topic are transmitted to the client. Specifically, transmitting the answer calculation value to the client further includes: encrypting the answer calculation value and transmitting the encrypted answer calculation value to the client; or transmitting the answer calculation value to the client in a plaintext mode.
When the client is a data interceptor, that is, when the data interceptor intercepts data, after transmitting the answer calculated value to the client in a plaintext manner, the data interceptor accordingly directly obtains the answer calculated value as an answer in a plaintext manner. In an alternative embodiment, after transmitting the encrypted answer calculation value to the client, the data interceptor decrypts the encrypted answer calculation value based on the key and obtains the answer calculation value as the answer. Therefore, even if the data interception party steals the private key through technologies such as network attack and the like, the answer calculation value obtained according to the stolen private key is a false correct answer, and therefore the data security of the correct answer can be protected.
Before the target client receives the answer calculation value and the network title, the target client may store a predetermined algorithm and an anti-confusion processing rule corresponding to the confusion processing in advance. In an optional embodiment, when the target client receives the encrypted answer calculation value, the target client stores a private key in advance, and decrypts the encrypted answer calculation value through the private key to obtain the answer calculation value.
When the client is a target client, namely when data is normally sent through the network, the client receives an answer calculation value and a network topic from the server; converting the received network questions into a group of numerical values of a digit system; calculating the numerical value of a group of digit system through a convention algorithm to obtain a second result value; and performing anti-confusion processing on the received answer calculation value and the second result value to obtain a correct answer. Specifically, the process of anti-confusing the received answer calculation value and the second result value further includes: when the confusion calculation is that the digit numerical value corresponding to the correct answer D is subtracted from 1, the anti-confusion processing rule is that the calculated value of the received answer is added from 1; when the confusion calculation is that the digit numerical value corresponding to the correct answer A is self-added with 1, the anti-confusion processing rule is that the calculation value of the received answer is self-subtracted with 1; when the confusion calculation is that the partial digits of the first result value and the digit system numerical value corresponding to the correct answer are subtracted, the anti-confusion processing rule is that the second result value and the received answer calculation value are added for calculation; or when the partial digits of the first result value and the corresponding partial digits of the binary numerical value corresponding to the correct answer are subjected to exclusive-or calculation, the partial digits of the second result value and the received answer calculation value are subjected to exclusive-or calculation.
Hereinafter, with reference to fig. 2, an answer protection method for a network topic will be described. The method comprises the following specific steps:
1. before the server transmits the answer, the question is converted into a digit number;
2. calculating the converted numerical value through an agreed algorithm to obtain a result value (1);
3. calculating (for example, subtracting) the topic calculation result value (1) and the correct answer value (2), wherein the answer calculation value is (1);
4. the answer calculation value (1) is used as an answer and is transmitted in plaintext data;
5. after the data interception party acquires the data, the data interception party mistakenly regards the difference value (1) as a correct answer;
6. after receiving the data, the client converts the questions into a digital number with a digital system;
7. calculating a final result value (1) of the converted numerical value through an agreed algorithm; and
8. and calculating (e.g. adding) the final result value (1) and the received answer (1) to obtain a correct answer (2).
Hereinafter, an answer protection method for a network topic is described by way of a specific example.
Example 1
Title: one plus one equals several
Answer choices A-B-C-three-D-four
The correct answer B
1. The title is converted into four-bit system (for example, the scheme can be converted into various system values) data 10320000 11022200 10320000 13231021 10322032 11013200;
2. calculated by an algorithm (here, a simple algorithm is exemplified, the algorithm is more than one), all the values are added to obtain 200221113, and the last 3 is taken as the result value of the calculation of the title;
3. answer B corresponds to 1 in the four-digit scale (0, 1,2, 3);
4. the absolute value of the subtraction of 1 and 3 is 2;
5. 2, transmitting C to the client (the answer can be transmitted by using the traditional encryption or the plaintext) when the answer is C;
6. the client converts C into 2 in the corresponding quaternary system (0, 1,2, 3);
7. the client side calculates a result value 3 of the topic in the same way as the steps 1 and 2;
8. adding 3 and 2 to obtain a four-digit value of 11; and
9. the last bit 1 is converted into an answer B, and the client side obtains a correct answer B.
Therefore, when the cheater catches the packet in step 5 to obtain the wrong answer C, the wrong answer is mistaken as the correct answer, and the purpose of protecting the answer of the network question is achieved.
Example 2
Title 5 × 2=?
Answer choices A8B 52C 10D 12
Correct answer C
1. Converting the title into a binary system 00110101 11010111 00110010 00111101 1111111100011111 after the data is converted;
2. carrying out binary XOR operation on the 2 bits of the data to obtain 10;
3. the answer C letter (i.e., ascii code) is 11 in the corresponding binary 01000011 followed by 2 bits;
4. performing exclusive or operation on the last two binary digits obtained from 2 and 3 to obtain 01 and a option (A01000001B 01000010C 01000011D 01000100), and matching the last 2 binary digits to obtain a wrong answer A;
5. calculating an error answer A, and transmitting the error answer A to the client (the answer can be transmitted by using the traditional encryption or the plaintext);
6. the client calculates 10 as the steps 1 and 2;
7. performing exclusive or on the calculated result value 10 and the last two binary systems of the binary system 01000001 corresponding to the answer A obtained by the client to obtain a result, wherein two bits are 11; and
8. 11 converts to answer C (01000011) and the client gets the correct answer C.
Therefore, when the cheater catches the packet in step 5 to obtain the wrong answer A, the wrong answer is mistaken for the correct answer, and the purpose of protecting the answer of the network topic is achieved.
Example 3
Title 5-2=?
Answer choices A0B 1 C2 D3
Correct answer D
1. The title is converted into a binary system 00110101 11010111 00110010 00111101 1111111100011111 after the data is converted;
2. adding the data to obtain the last bit as 0;
3. the correct answer D is reduced by one bit to C if it is 0 (and A if it is 1);
4. calculating an error answer C, and transmitting the error answer C to the client (the answer can be transmitted by using the traditional encryption or the plaintext);
5. the client calculates 0 as in step 1 and step 2;
6. adding one bit to obtain D when the wrong answer C is 0 (subtracting one bit to obtain B when the answer C is 1); and
7. the client obtains the correct answer D.
When the cheater catches the packet in step 4 to obtain the wrong answer C, the wrong answer is mistaken as the correct answer, and therefore the purpose of protecting the answer of the network question is achieved.
In another embodiment of the present invention, an answer protection device for network questions is disclosed. Referring to fig. 3, the answer protection apparatus for network titles includes: the network topic conversion module 302 is configured to convert a network topic into a set of numerical values in a digital system through a server; a first result value obtaining module 304, configured to calculate a numerical value of a set of binary digits by using a convention algorithm to obtain a first result value; a confusion processing module 306, configured to perform confusion processing on a part of digits of the first result value and a digit system value corresponding to the correct answer to obtain an answer calculation value, where the digit system of the network question is consistent with the digit system of the correct answer; and a sending module 308, configured to use the answer calculation value as an answer and transmit the answer and the network topic to the client.
The answer protection device for the network questions further comprises a plurality of other modules, and since the answer protection device for the network questions corresponds to the answer protection method for the network questions, detailed descriptions of the plurality of other modules are omitted herein to avoid redundancy.
Compared with the prior art, the invention can realize at least one of the following beneficial effects:
1. the answer data is obfuscated by the answer protection method of the network topic provided by the invention, and the answer for obfuscating is sent in a plaintext or ciphertext mode;
2. when the data interception party cracks the answer of the confusion processing according to the stolen private key, the data interception party mistakenly thinks that the correct answer is obtained, and the correct answer is confused, so that the data safety of the correct answer is protected; and
3. the target client can obtain a correct answer through simple processing according to a pre-stored predetermined algorithm, confusion processing and a private key, so that the normal use of the target client is not influenced.
Those skilled in the art will appreciate that all or part of the flow of the method implementing the above embodiments may be implemented by a computer program, which is stored in a computer readable storage medium, to instruct related hardware. The computer readable storage medium is a magnetic disk, an optical disk, a read-only memory or a random access memory.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (9)
1. An answer protection method for a network topic, comprising:
converting the network title into a numerical value of a group of digit system through a server;
calculating the numerical value of the group of digit system by a convention algorithm to obtain a first result value;
confusing partial digits of the first result value with digit system values corresponding to correct answers to obtain answer calculation values, wherein the digit system of the network question is consistent with the digit system of the correct answers; and
taking the answer calculation value as an answer and transmitting the answer and the network question to a client, wherein the confusing processing of the partial digit of the first result value and the digit system numerical value corresponding to the correct answer comprises the following steps:
when the partial digit of the calculation result value is 0 and the correct answer is D, the confusion processing is that the digit numerical value corresponding to the correct answer D is reduced by 1;
when the partial digit of the calculation result value is 0 and the correct answer is A, the obfuscation processing is that the digit numerical value corresponding to the correct answer A is self-added by 1; and
when the partial digits of the calculation result value are not 0, the obfuscating is to perform subtraction operation on the partial digits of the first result value and the digit scale numerical value corresponding to the correct answer and use an absolute value of the subtraction operation as the answer calculation value or perform exclusive or calculation on the partial digits of the first result value and the corresponding partial digits of the digit scale numerical value corresponding to the correct answer.
2. The answer protection method for network topics as claimed in claim 1, wherein the set of binary values comprises a set of binary values or a set of binary values.
3. The method for protecting answers to network topics as claimed in claim 2, wherein calculating values of said set of bittables by a convention algorithm further comprises:
adding the numerical values of the group of four-digit systems by appointed addition; or
And carrying out exclusive-or calculation on partial digits of each value in a group of binary values by using a conventional exclusive-or algorithm.
4. The method for protecting answers to network questions recited in claim 1, wherein transmitting said calculated answer values to a client further comprises:
encrypting the answer calculation value and transmitting the encrypted answer calculation value to the client; or
And transmitting the answer calculation value to the client in a plaintext mode.
5. The answer protection method for network topics recited in claim 4, wherein when the client is a data interceptor,
the data interception party directly obtains the answer calculation value as an answer in a plaintext mode; or
And the data interception party decrypts the encrypted answer calculation value based on a secret key and obtains the answer calculation value as an answer.
6. The answer protection method for network topics according to any one of claims 1 to 4, wherein when the client is a target client,
the client receives the answer calculation value and the network topic from the server;
converting the received network title into a group of numerical values with a binary digit system;
calculating the numerical value of the group of digit system by a convention algorithm to obtain a second result value; and
and performing anti-confusion processing on the received answer calculation value and the second result value to obtain a correct answer.
7. The method for protecting answers to network questions of claim 6, wherein before said target client receives said answer calculation value and said network question, further comprising: the target client pre-stores the convention algorithm and the anti-confusion processing rule corresponding to the confusion processing,
when the target client receives the encrypted answer calculation value, the target client stores a private key in advance, and decrypts the encrypted answer calculation value through the private key to obtain the answer calculation value.
8. The method of claim 6, wherein de-obfuscating the received calculation answer value and the second result value further comprises:
when the confusion processing is that the digit numerical value corresponding to the correct answer D is self-reduced by 1, the anti-confusion processing rule is that the received answer calculation value is self-increased by 1;
when the confusion processing is the self-adding of 1 to the digit numerical value corresponding to the correct answer a, the anti-confusion processing rule is the self-subtracting of 1 from the received answer calculation value;
when the confusion processing is subtraction operation of a part of digits of the first result value and a digit system numerical value corresponding to a correct answer, the anti-confusion processing rule is to add the second result value and the received answer calculation value; or alternatively
And when the partial digits of the first result value and the corresponding partial digits of the binary numerical value corresponding to the correct answer are subjected to exclusive-OR calculation, the partial digits of the second result value and the received answer calculation value are subjected to exclusive-OR calculation.
9. An answer protection device for a network topic, comprising:
the network topic conversion module is used for converting the network topic into a numerical value of a group of digit system through a server;
the first result value acquisition module is used for calculating the numerical value of the group of digit system through a convention algorithm to obtain a first result value;
the confusion processing module is used for performing confusion processing on part of digits of the first result value and digit system numerical values corresponding to correct answers to obtain answer calculated values, wherein the digit system of the network question is consistent with the digit system of the correct answers, and when the part of digits of the calculated result value is 0 and the correct answers are D, the confusion processing is that the digit system numerical value corresponding to the correct answers D is reduced by 1;
when the partial digit of the calculation result value is 0 and the correct answer is A, the obfuscation processing is that the digit numerical value corresponding to the correct answer A is self-added by 1; and
when the number of partial digits of the calculation result value is not 0, the obfuscating process is to perform subtraction operation on the partial digits of the first result value and the digit system numerical value corresponding to the correct answer and use the absolute value of the subtraction operation as the answer calculation value or perform exclusive or calculation on the partial digits of the first result value and the corresponding partial digits of the digit system numerical value corresponding to the correct answer; and
and the sending module is used for taking the answer calculation value as an answer and transmitting the answer and the network title to a client.
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