CN103795524B - Dynamic SMS encryption based on 3DES, decryption method - Google Patents
Dynamic SMS encryption based on 3DES, decryption method Download PDFInfo
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- CN103795524B CN103795524B CN201410034009.4A CN201410034009A CN103795524B CN 103795524 B CN103795524 B CN 103795524B CN 201410034009 A CN201410034009 A CN 201410034009A CN 103795524 B CN103795524 B CN 103795524B
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Abstract
Present invention is disclosed a kind of dynamic SMS encryption based on 3DES, decryption method, the encryption method comprises the following steps：3 key key are dynamically got according to the time of transmission short message, sender's phone number, recipient's phone number；The Content Transformation of information will be sent into Unicode codes, be grouped in units of N positions, be filled in group less than N positions with PKCS7Padding mode；Based on 3 key obtained in above-mentioned steps, the content after being changed to information to form ciphertext using 3DES algorithms to being encrypted.Dynamic SMS encryption proposed by the present invention based on 3DES, decryption method; the public key of other side is uploaded and obtained without server; consult cipher mode or key without both sides; key is dynamically generated using each opportunity for sending short message; easy and effective, randomness is high, also is difficult to crack out content even if short message is stolen or intercepted; privacy degrees are improved, are effectively protected the privacy of user.
Description
Technical field
The invention belongs to communication technique field, is related to a kind of information ciphering method, more particularly to a kind of dynamic based on 3DES
State message encryption method；Meanwhile the invention further relates to a kind of dynamic short message decryption method based on 3DES.
Background technology
The popularization of smart mobile phone brings facility to our life, and people are more and more personal by sending and receiving short messages
Information and various business informations, but the problem of these message are often faced with security, for example steal, intercept.
In view of this, nowadays there is an urgent need to design a kind of new information ciphering method, to overcome existing information sender
The drawbacks described above of formula.
The content of the invention
The technical problems to be solved by the invention are：A kind of dynamic message encryption method based on 3DES is provided, it can be ensured that
The security of information transfer.
In addition, the present invention also provides a kind of dynamic short message decryption method based on 3DES, it can be ensured that the safety of information transfer
Property.
In order to solve the above technical problems, the present invention adopts the following technical scheme that：
A kind of dynamic message encryption method based on 3DES, the encryption method comprise the following steps：
Step S11,3 are dynamically got according to the time of transmission short message, sender's phone number, recipient's phone number
Individual key key；
Step S12, the Content Transformation of information will be sent into Unicode codes, be grouped in units of N positions, in group not
Sufficient N positions are filled with PKCS7Padding mode；
Step S13, based on 3 key obtained in step S11, the content after being changed to information is using 3DES algorithms to entering
Row encryption forms ciphertext.
As a preferred embodiment of the present invention, the encryption method specifically comprises the following steps：
Step S101, editing short message content, short message sending pattern is selected, if selection ciphertext transfer mode, performs step
S102 to S105；
Step S102,3 key of dynamic generation, the date first key k1 on the same day is obtained；The phone number of sender is taken to make
For the second key k2, the method for being added remainder by from left to right adjacent bit if number is more than 8 is changed to obtain one 8
Number, it is filled if number is less than 8 with PKCS7Padding mode；The cell-phone number of recipient is taken with same method
Code is used as the 3rd key k3；
Step S103, short message content is converted to the form of Unicode codes, DES algorithms are the data progress with 64
Processing, so being that content of short message is divided into several groups by unit by 64, if the data deficiencies 64 of last group, is used
PKCS7Padding mode is filled, the total amount of byte that the syllabified code each filled is filled out；
Step S104, short message content packet is encrypted with 3DES, encryption formula is：msg=Ek3(Dk2(Ek1
(msg) des encryption generation first message msg1), i.e., is first carried out with first key k1 to message content msg, then with the second key
K2 carries out DES decryption the second message m sg2 of generation to first message msg1, and finally the second message m sg2 is entered with the 3rd key k3
Row des encryption generates final ciphertext msg3;
Step S105, sent final ciphertext msg3 as content of short message.
A kind of dynamic short message decryption method based on 3DES, it is characterised in that the decryption method comprises the following steps：
Step S21, according to receive short message opportunity and sender, the phone number of recipient dynamically get 3 it is close
Key key；
Step S22, based on 3 key obtained in step S21,3DES algorithms are used to solving to the ciphertext received
It is close to be formed in plain text；
Step S23, each group is converted into corresponding text information from Unicode codes in plain text, combines and remove last fill out
Fill information and obtain final plaintext short message.
As a preferred embodiment of the present invention, short message step S201, is received, judges whether it is ciphertext pattern, if
It is to perform step S202；
Step S202, the information content to be decrypted is chosen whether by prompting, if performing step S203 to step S205；
Step S203,3 key of dynamic generation, the date first key k1 on the same day is obtained；The phone number of sender is taken to make
For the second key k2, the method for being added remainder by from left to right adjacent bit if number is more than 8 is changed to obtain one 8
Number, it is filled if number is less than 8 with PKCS7Padding mode；The cell-phone number of recipient is taken with same method
Code is used as the 3rd key k3；
Step S204, short message content is decrypted with 3DES algorithms, decryption formula is msg=Dk1 (EK2 (Dk3
(msg) DES decryption the 4th message m sg4 of generation)), i.e., are first carried out with the 3rd key k3 to message content msg, then with the second key
K2 carries out des encryption to msg1 and generates the 5th message m sg5, finally carries out DES decryption to the 5th message m sg5 with first key k1
Generate final plaintext msg3；
Step S205, each group is converted into corresponding text information from Unicode codes in plain text, combines and remove last fill out
Fill information and obtain final plaintext short message.
The beneficial effects of the present invention are：Dynamic SMS encryption proposed by the present invention based on 3DES, decryption method, without
The public key of other side is uploaded and obtained by server, consults cipher mode or key without both sides, utilizes each transmission short message
Opportunity is dynamically generated key, easy and effective, and randomness is high, also is difficult to crack out content even if short message is stolen or intercepted,
Privacy degrees are improved, are effectively protected the privacy of user.
The present invention obtains 3 dynamic key by the opportunity and sender, recipient's number that send short message first in transmitting terminal；
Then short message content is changed and is grouped；Short message content packet is encrypted using 3DES methods afterwards；Finally
The ciphertext obtained after encryption is transmitted as short message content.3 dynamic key are obtained in the same way in receiving terminal；
Then ciphertext block is decrypted using 3DES methods；Afterwards by the information combination transformational analysis of each group；After finally decrypting
Obtained plaintext is shown.
Brief description of the drawings
Fig. 1 is the process that the information content is encrypted transmitting terminal.
Fig. 2 is the process that transmitting terminal is encrypted using 3 key of dynamic generation.
Fig. 3 is the process that the information content is decrypted receiving terminal.
Fig. 4 is the process that receiving terminal is decrypted using 3 key of dynamic generation.
Embodiment
The preferred embodiment that the invention will now be described in detail with reference to the accompanying drawings.
Embodiment one
The present invention obtains 3 dynamic key by the opportunity and sender, recipient's number that send short message first in transmitting terminal；
Then short message content is changed and is grouped；Short message content packet is encrypted using 3DES methods afterwards；Finally
The ciphertext obtained after encryption is transmitted as short message content.3 dynamic key are obtained in the same way in receiving terminal；
Then ciphertext block is decrypted using 3DES methods；Afterwards by the information combination transformational analysis of each group；After finally decrypting
Obtained plaintext is shown.
Present invention is disclosed a kind of dynamic message encryption method based on 3DES, the encryption method comprises the following steps：
Step S11,3 are dynamically got according to the time of transmission short message, sender's phone number, recipient's phone number
Individual key key；
Step S12, the Content Transformation of information will be sent into Unicode codes, with N positions（Such as 64）Divided for unit
Group, less than N positions in group（Such as 64）Be filled with PKCS7Padding mode；
Step S13, based on 3 key obtained in step S11, the content after being changed to information is using 3DES algorithms to entering
Row encryption forms ciphertext.
Specifically, referring to Fig. 1, the dynamic message encryption method based on 3DES comprises the following steps：
【Step A】Editing short message content, short message sending pattern is selected, if selection ciphertext transfer mode, performs step B extremely
E；
【Step B】3 key of dynamic generation, obtain the date on the same day（The day on the same day is taken in view of the possibility of short message delay
Phase rather than specifically send the time）As " 20131130 " are used as first key k1；The phone number of sender is taken as second
Key k2, the method for being added remainder by from left to right adjacent bit if number is more than 8 are changed to obtain 8 digits (such as 9
Number 123456789 then according to said method performs a 1+2,2+3,3+4,4+5,5+6,6+7,7+8,8+9 and takes units to obtain
35791357), it is filled if number is less than 8 with PKCS7Padding mode（Cover is if 12345
12345333）；The phone number for taking recipient by the use of same method is used as the 3rd key k3；Certainly, the digit of key can also
, not necessarily can only be 8 for other.
【Step C】Short message content is converted to the form of Unicode codes, because DES algorithms are the data progress with 64
Processing, so to be that content of short message is divided into several groups by unit by 64, if the data deficiencies 64 of last group, is used
PKCS7Padding mode is filled, the total amount of byte that the syllabified code each filled is filled out, and such as " hello ", is write as 16
System position { 68,65,6C, 6C, 6F }, it is after filling { 68,65,6C, 6C, 6F, 03,03,03 }；
【Step D】Short message content packet is encrypted (such as Fig. 2) with 3DES, encryption formula is：msg=Ek3(Dk2
(Ek1 (msg)), i.e., des encryption generation msg1 is first carried out with k1 to message content msg, then with k2 msg1 is carried out DES solve it is dense
Into msg2, des encryption is finally carried out to msg2 with k3 and generates final ciphertext msg3;
【Step E】Sent final ciphertext msg3 as content of short message.
The present invention also discloses a kind of dynamic short message decryption method based on 3DES, and the decryption method comprises the following steps：
Step S21, according to receive short message opportunity and sender, the phone number of recipient dynamically get 3 it is close
Key key；
Step S22, based on 3 key obtained in step S21,3DES algorithms are used to solving to the ciphertext received
It is close to be formed in plain text；
Step S23, each group is converted into corresponding text information from Unicode codes in plain text, combines and remove last fill out
Fill information and obtain final plaintext short message.
Referring to Fig. 3, the decryption in receiving terminal specifically includes following steps：
【Step F】Short message is received, judges whether it is ciphertext pattern, if performing step G；
【Step G】The information content to be decrypted is chosen whether by prompting, if performing step H to J；
【Step H】3 key are obtained with mode dynamic same in transmitting terminal step B；
【Step I】Short message content is decrypted (such as Fig. 4) with 3DES algorithms, decryption formula is msg=Dk1 (EK2
(Dk3 (msg))), i.e., DES decryption generation msg1 are first carried out to message content msg with k3, then des encryption is carried out to msg1 with k2
Msg2 is generated, DES decryption is finally carried out to msg2 with k1 and generates final plaintext msg3；
【Step J】Each group is converted into corresponding text information from Unicode codes in plain text, combines and removes last filling
Information obtains final plaintext short message.
In summary, the dynamic SMS encryption proposed by the present invention based on 3DES, decryption method, without on server
The public key of other side is passed and obtained, consults cipher mode or key without both sides, is dynamically given birth to using each opportunity for sending short message
Easy and effective into key, randomness is high, also is difficult to crack out content even if short message is stolen or intercepted, improves secrecy journey
Degree, it is effectively protected the privacy of user.
Here description of the invention and application are illustrative, are not wishing to limit the scope of the invention to above-described embodiment
In.The deformation and change of embodiments disclosed herein are possible, real for those skilled in the art
The replacement and equivalent various parts for applying example are known.It should be appreciated by the person skilled in the art that the present invention is not being departed from
Spirit or essential characteristics in the case of, the present invention can in other forms, structure, arrangement, ratio, and with other components,
Material and part are realized.In the case where not departing from scope and spirit of the present invention, embodiments disclosed herein can be entered
The other deformations of row and change.
Claims (2)
1. a kind of dynamic message encryption method based on 3DES, it is characterised in that the encryption method comprises the following steps：
Step S11, according to send time of short message, sender's phone number, recipient's phone number dynamically get 3 it is close
Key key；
Step S12, the Content Transformation of information will be sent into Unicode codes, be grouped in units of N positions, less than N positions in group
Be filled with PKCS7Padding mode；
Step S13, based on 3 key obtained in step S11, the content after being changed to information is using 3DES algorithms to adding
Close formation ciphertext；
The encryption method specifically comprises the following steps：
Step S101, editing short message content, short message sending pattern is selected, if selection ciphertext transfer mode, performs step S102
To S105；
Step S102,3 key of dynamic generation, the date first key k1 on the same day is obtained；The phone number of sender is taken as
Two key k2, the method for being added remainder by from left to right adjacent bit if number is more than 8 are changed to obtain 8 digits, such as
Fruit number is less than 8 to be then filled with PKCS7Padding mode；The phone number for taking recipient with same method is made
For the 3rd key k3；
Step S103, short message content is converted to the form of Unicode codes, DES algorithms are handled with the data of 64
, so being that content of short message is divided into several groups by unit by 64, if the data deficiencies 64 of last group, is used
PKCS7Padding mode is filled, the total amount of byte that the syllabified code each filled is filled out；
Step S104, short message content packet is encrypted with 3DES, encryption formula is：Msg=Ek3 (Dk2 (Ek1
(msg) des encryption generation first message msg1), i.e., is first carried out with first key k1 to message content msg, then with the second key
K2 carries out DES decryption the second message m sg2 of generation to first message msg1, and finally the second message m sg2 is entered with the 3rd key k3
Row des encryption generates final ciphertext msg3；
Step S105, sent final ciphertext msg3 as content of short message.
2. a kind of dynamic short message decryption method based on 3DES, it is characterised in that the decryption method comprises the following steps：
Step S21, according to receive time of short message, sender's phone number, recipient's phone number dynamically get 3 it is close
Key key；
Step S22, based on 3 key obtained in step S21,3DES algorithms are used to shape is decrypted to the ciphertext received
Into in plain text；
Step S23, each group is converted into corresponding text information from Unicode codes in plain text, combines and remove last filling letter
Breath obtains final plaintext short message；
The decryption method specifically comprises the following steps：
Step S201, short message is received, judges whether it is ciphertext pattern, if performing step S202；
Step S202, the information content to be decrypted is chosen whether by prompting, if performing step S203 to step S205；
Step S203,3 key of dynamic generation, the date first key k1 on the same day is obtained；The phone number of sender is taken as
Two key k2, the method for being added remainder by from left to right adjacent bit if number is more than 8 are changed to obtain 8 digits, such as
Fruit number is less than 8 to be then filled with PKCS7Padding mode；The phone number for taking recipient with same method is made
For the 3rd key k3；
Step S204, short message content is decrypted with 3DES algorithms, decryption formula is msg=Dk1 (EK2 (Dk3
(msg) DES decryption the 4th message m sg4 of generation)), i.e., are first carried out with the 3rd key k3 to message content msg, then with the second key
K2 carries out des encryption to msg1 and generates the 5th message m sg5, finally carries out DES decryption to the 5th message m sg5 with first key k1
Generate final plaintext msg3；
Step S205, each group is converted into corresponding text information from Unicode codes in plain text, combines and remove last filling letter
Breath obtains final plaintext short message.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104363584B (en) * | 2014-11-27 | 2018-06-15 | 宇龙计算机通信科技(深圳)有限公司 | A kind of method, apparatus and terminal of short message Encrypt and Decrypt |
| CN104640091B (en) * | 2015-01-13 | 2019-10-18 | 董红伟 | A kind of SMS encryption communication method |
| CN106302514A (en) * | 2016-09-06 | 2017-01-04 | 苏州协鑫集成科技工业应用研究院有限公司 | The dynamic encrypting method of memory card and decryption method and device thereof |
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| CN101820593A (en) * | 2009-06-04 | 2010-09-01 | 岳曙光 | Intelligent SIM card and method for realizing transmission and processing of data short message through same |
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