CN101720071B - Short message two-stage encryption transmission and secure storage method based on safety SIM card - Google Patents

Short message two-stage encryption transmission and secure storage method based on safety SIM card Download PDF

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Publication number
CN101720071B
CN101720071B CN200910227210A CN200910227210A CN101720071B CN 101720071 B CN101720071 B CN 101720071B CN 200910227210 A CN200910227210 A CN 200910227210A CN 200910227210 A CN200910227210 A CN 200910227210A CN 101720071 B CN101720071 B CN 101720071B
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Prior art keywords
short message
service server
safe
user
file cabinet
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CN101720071A (en
Inventor
董建强
常朝稳
司志刚
秦晰
赵国磊
梁松涛
廖正赟
王一宁
刘熙胖
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Zhengzhou Xinda Jiean Information Technology Co Ltd
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Zhengzhou Xinda Jiean Information Technology Co Ltd
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Abstract

The invention relates to a short message two-stage encryption transmission and secure storage method based on a safety SIM card, which comprises two steps of encryption transmission and encryption storage of a short message. A mobile phone terminal and a safety short message server negotiate a session key through an agreed protocol, and a safety transmission channel is established between the mobile phone terminal and the safety short message server. The mobile phone terminal and the safety short message server encrypt and decrypt the short message through the session key, the short message is always in a ciphertext state during air transmission, and a cleartext occurs after the short message is born. For the short message requiring for encryption storage, the short message is encrypted for storage in a filing cabinet form, the grouping quantity of filing cabinets is dynamically changeable, and the unique identification code of the filing cabinets is an access password thereof. The storage method greatly protects the privacy of the short message of a user for the encryption storage.

Description

Short message two-stage encryption transmission and method for secure storing based on the safety SIM
Technical field:
The present invention relates to the method for sending and receiving short messages and storage between a kind of mobile subscriber equipment, particularly a kind of short message two-stage encryption transmission and method for secure storing based on the safety SIM.
Background technology:
SIM is the abbreviation of (Subscriber Identity Model client identification module), is also referred to as smart card, subscriber identification card, and the GSM digital mobile telephone must be loaded onto this card and can use.SIM has and sends SMS message, receives message function.According to the GSM standard agreement, SIM according to the reference format transmission that packages, can also receive the short message that wireless network sends over to the good short message of compiling, stores into automatically in SIM or the mobile phone then.Along with the convenience that has with short message itself of popularizing of mobile terminal device, quick, advantages such as cost; Have the more and more mobile user with short message as information carrier, carry out information inquiry, service announcements; Information activities such as online transaction; Because these activities often relate to sensitivity or important information, therefore, higher demand for security has been proposed for the safety of short message.Short message service is at present used and is had some defectives:
1. the content of information is transmitted with clear-text way, can be through technological means intercepting content of short message easily, and cause the information content to be stolen or leak.
2. the content of information is stored on the mobile device with clear-text way, in case lose or checked that by other people information content privacy can expose.
The receiving short message both sides have very high user demand to privacy and fail safe in short message transmission and the storing process.
Summary of the invention:
The objective of the invention is to overcome the deficiency that exists in the prior art and provide a kind of under the support of safety SIM, the realization to consult, carry out that short message lands that deciphering and encrypting is transmitted and realize that based on the classified document cabinet short message encrypts the short message two-stage encryption transmission and the method for secure storing based on the safety SIM of storage security function based on the safety short message service server based on the dynamic session of public key certificate.
The objective of the invention is to realize like this: this method comprises the short message encrypted transmission and encrypts two steps of storage:
1), short message encrypted transmission step, be divided into two stages to realize:
Phase I, the protocol negotiation through agreement between mobile phone terminal and the safe short message service server goes out session key, and between is set up secure transmission tunnel;
Second stage, mobile phone terminal and safe short message service server are utilized session key that short message is carried out encryption and decryption and are handled, and guarantee that short message is the ciphertext state in the transmission course all the time aloft, expressly land the back at short message and occur;
2) short message encryption storing step is that the short message that the encryption storage demand is arranged is encrypted storage according to the organizational form of file cabinet, file cabinet grouping number dynamically changeable, and the unique identification sign indicating number of file cabinet is its access code.STK uses the password that lands through the user and matees a wherein group file cabinet automatically, and the user can only check the content of short message that oneself lands under the affiliated encrypt file cabinet of password.
Described session key is based on public key certificate and consults the session key in the short message transmission process, and according to the dynamic on-line replacing user conversation of actual user demand key, may further comprise the steps:
1), the distribution of public key certificate:
A, certificate server are that safe short message service server and terminal use generate public key certificate separately;
B, certificate server off-line write safe short message service server public key certificate to the safety SIM;
C, certificate server are notified safe short message service server client public key certificate;
2), session key agreement:
Pass through public key certificate between terminal use and the safe short message service server; Realize both sides' authentication; Negotiate session key, realize then receiving confidentiality, the authenticity and integrity service that short message transmits between the both sides, the message that key agreement protocol sent is following:
C->S:Nc
S->C:PEc(SIGs(Kcs,Nc,Ns))
C->S:Ns
Wherein C representes the portable terminal transmit leg, and S representes safe short message service server recipient; PEc representes the public key encryption with C, and SIGs representes the private key signature with S,
The step that the session key agreement agreement is carried out is following:
The first step, the sending direction recipient sends the plaintext authentication request, and request content comprises that the terminal produces proof factor Nc;
Second step; Safe short message service server is searched the corresponding certificate of this user based on the phone number of portable terminal; And after this certificate legitimacy of certificate server checking; Produce a session key Kcs and proof factor Ns, utilize the encrypted public key of oneself private key and portable terminal Kcs, Ns, Nc are signed and to encrypt, pass to portable terminal then;
The 3rd step; The cipher-text information that portable terminal sends the safety short message service server is carried out DecryptDecryption (earlier test label, use self private key DecryptDecryption again with the PKI of the safe short message service server that prestores); After the inspection Nc unanimity, Ns is passed to safe short message service server with plaintext;
In the 4th step, after checking was passed through, portable terminal was passed to safe short message service server with Ns, and server compares Ns that receives and original Ns, confirms to consult successfully.
Described short message encryption and decryption is handled and is meant that encrypted short message lands decryption processing and transmit with encrypting on the safety short message service server, utilizes session key to carry out the short message encryption and decryption and handles, and the sending and receiving short messages step is following:
The first step; Terminal use A is to the terminal use B M that sends SMS message, and this message M uses the session key Kca that consults between user A and the safe short message service server to encrypt, and obtains message ciphertext C1; C1=EKca (M), C1 at first is sent to safe short message service server;
In second step, safe short message service server is received this ciphertext C1, to message C1 deciphering, obtains M, M=DKca (C1) with session key Kca;
In the 3rd step, safe short message service server is encrypted clear-text message M with the session key Kcb of user B, obtain ciphertext C2, C2=EKcb (M);
The 4th one, safe short message service server sends to user B with ciphertext C2, and user B uses Kcb that C2 is deciphered, and obtains M.M=DKcb(C2);
Here E and D represent the encryption and decryption operation in the symmetric cryptography respectively;
So far short message M,, is existed with the ciphertext form in transmission course to user B by user A safe transmission all the time.
Described short message is encrypted storage and is meant that it is following to use the encrypt file cabinet to encrypt storing step to there being the short message of encrypting storage demand to encrypt storage according to the organizational form of file cabinet:
The first step, set up the file cabinet structure: the memory space that safe SIM will block is divided into each group by the form of file cabinet;
Second step; The user is provided with file cabinet: the corresponding operator password of each file cabinet; Can only check the note in the affiliated encrypt file cabinet of own input operation password when checking note; If forget encrypt file cabinet operator password, need reset this document cabinet, delete All Files and information in this encrypt file cabinet simultaneously;
In the 3rd step, the note of receiving number is stored according to file cabinet, and the user has only the operator password of this cabinet correspondence of input just can check note.
The present invention has following good effect: aspect the short message encrypted transmission; Carry out short message based on the safety short message service server and land deciphering and encrypt to transmit; Guarantee that short message is the ciphertext state in the transmission course all the time aloft, expressly only land the back and occur at short message.Aspect short message encryption storage,, the short message of encrypting storage demand encrypts storage according to the organizational form of file cabinet to being arranged.The user can only check the content of short message that oneself lands under the affiliated encrypt file cabinet of password.This method allows user's dynamic assignment file cabinet quantity, and the concrete structure of file cabinet is sightless to other users, has greatly protected user's short message to encrypt the privacy of storage.
Description of drawings:
Fig. 1 is a certificate distribution procedure sketch map of the present invention.
Fig. 2 is a session key agreement sketch map of the present invention.
Fig. 3 is that short message encryption and decryption of the present invention is handled sketch map.
Fig. 4 is an encrypt file cabinet sketch map of the present invention.
Embodiment:
As shown in Figure 1, safe SIM of the present invention is on the basis of common SIM, carries out safety Design again based on chip, calling and the use of system resource is all had strict control of authority function.To the input and output of sensitive data, can adopt the safe packet load mode, guarantee the safety of data.The Generally Recognized as safe SIM is supported symmetry algorithm and asymmetric arithmetic.
1, consult based on the dynamic session of public key certificate, it is characterized in that: consult the session key in the short message transmission process based on public key certificate, and can may further comprise the steps according to the dynamic on-line replacing user conversation of actual user demand key:
1), public key certificate distribution:
A. certificate server is that safe short message service server and terminal use generate public key certificate separately;
B. the certificate server off-line writes safe short message service server public key certificate to the safety SIM;
C. certificate server is notified safe short message service server client public key certificate;
2), session key agreement: pass through public key certificate between terminal use and the safe short message service server; Realize both sides' authentication; Negotiate session key, realize then receiving confidentiality, the authenticity and integrity service that short message transmits between the both sides, as shown in Figure 2.
The message that key agreement protocol sent is following:
C->S:Nc
S->C:PEc(SIGs(Kcs,Nc,Ns))
C->S:Ns
Wherein C representes transmit leg (portable terminal), and S representes recipient's (safe short message service server); PEc representes the public key encryption with C, and SIGs representes the private key signature with S.
The step that the session key agreement agreement is carried out is following:
The first step, the sending direction recipient sends the plaintext authentication request, and request content comprises that the terminal produces proof factor Nc;
Second step; Safe short message service server is searched the corresponding certificate of this user based on the phone number of portable terminal; And after this certificate legitimacy of certificate server checking; Produce a session key Kcs and proof factor Ns, utilize the encrypted public key of oneself private key and portable terminal Kcs, Ns, Nc are signed and to encrypt, pass to portable terminal then;
The 3rd step; The cipher-text information that portable terminal sends the safety short message service server is carried out DecryptDecryption (earlier test label, use self private key DecryptDecryption again with the PKI of the safe short message service server that prestores); After the inspection Nc unanimity, Ns is passed to safe short message service server with plaintext.
In the 4th step, after checking was passed through, portable terminal was passed to safe short message service server with Ns, and server compares Ns that receives and original Ns, confirms to consult successfully.
According to above step, the session key that negotiates can dynamically be changed by the user according to demand, has simplified the process of key updating, is user-friendly to and manages.
2, the short message encryption and decryption is handled: as shown in Figure 3, encrypted short message is landed decryption processing and is transmitted with encrypting on the safety short message service server, utilize session key to carry out the short message encryption and decryption and handle.
The first step, terminal use A is to the terminal use B M that sends SMS message, and this message M uses the session key Kca that consults between user A and the safe short message service server to encrypt, and obtains message ciphertext C1.C1=EKca (M), C1 at first is sent to safe short message service server;
In second step, safe short message service server is received this ciphertext C1, to message C1 deciphering, obtains M, M=DKca (C1) with session key Kca;
In the 3rd step, safe short message service server is encrypted clear-text message M with the session key Kcb of user B, obtain ciphertext C2, C2=EKcb (M);
The 4th one, safe short message service server sends to user B with ciphertext C2, and user B uses Kcb that C2 is deciphered, and obtains M.M=DKcb(C2);
Here E and D represent the encryption and decryption operation in the symmetric cryptography respectively.
So far, short message M,, is existed with the ciphertext form in transmission course to user B by user A safe transmission all the time, has prevented that message content is stolen and leaks.Adopt safe short message service server to carry out short message and land deciphering and encrypt to transmit, processing procedure is transparent to the user, by server storage and uniform user's session key, has solved terminal use's key management considerations simultaneously.
3, short message safe storage: encrypt storage according to the organizational form of file cabinet to the short message of encrypting storage demand is arranged.It is following to use the encrypt file cabinet to encrypt storing step:
The first step is set up the file cabinet structure.The memory space that safe SIM will block is divided into some groups by the form of file cabinet.
In second step, the user is provided with file cabinet.The corresponding operator password of each file cabinet can only be checked the note in the affiliated encrypt file cabinet of own input operation password when checking note.If forget encrypt file cabinet operator password, need reset this document cabinet, delete All Files and information in this encrypt file cabinet simultaneously.
In the 3rd step, the note of receiving number is stored according to file cabinet, and the user has only the operator password of this cabinet correspondence of input just can check note.
For example, the user is provided with password 12345678 corresponding No. 1 file cabinets, under No. 1 file cabinet, deposits note 1 and note 2.Password 87654321 corresponding No. 2 file cabinets are set, under No. 2 file cabinets, deposit note 3 and note 4, as shown in Figure 4.
When user's input operation password 12345678, can only see note 1 and 2; Note 3 and 4 couples of users are sightless.In like manner, when user's input operation key 87654321, note 1 and 2 couples of users are sightless.So just greatly guaranteed storage security,, also can can't obtain effective encrypted short message because of the classification and the restriction of operator password even others uses this mobile phone.

Claims (3)

1. the short message two-stage encryption based on the safety SIM transmits and method for secure storing, it is characterized in that: this method comprises the short message encrypted transmission and encrypts two steps of storage:
1), short message encrypted transmission step, be divided into two stages to realize:
Phase I, the protocol negotiation through agreement between mobile phone terminal and the safe short message service server goes out session key, and between is set up secure transmission tunnel;
Second stage, mobile phone terminal and safe short message service server are utilized session key that short message is carried out encryption and decryption and are handled, and guarantee that short message is the ciphertext state in the transmission course all the time aloft, expressly land the back at short message and occur;
2), short message encryption storing step is to there being the short message of encrypting storage demand to encrypt storage according to the organizational form of file cabinet; File cabinet grouping number dynamically changeable; The unique identification sign indicating number of file cabinet is its access code; STK uses the password that lands through the user and matees a wherein group file cabinet automatically, and the user can only check the content of short message that oneself lands under the affiliated encrypt file cabinet of password;
Described session key is based on public key certificate and consults the session key in the short message transmission process, and according to the dynamic on-line replacing user conversation of actual user demand key, may further comprise the steps:
1), the distribution of public key certificate:
A, certificate server are that safe short message service server and terminal use generate public key certificate separately;
B, certificate server off-line write safe short message service server public key certificate to the safety SIM;
C, certificate server are notified safe short message service server client public key certificate;
2), session key agreement:
Pass through public key certificate between terminal use and the safe short message service server; Realize both sides' authentication; Negotiate session key, realize then receiving confidentiality, the authenticity and integrity service that short message transmits between the both sides, the message that key agreement protocol sent is following:
C->S:Nc
S->C:PEc(SIGs(Kcs,Nc,Ns))
C->S:Ns
Wherein C representes the portable terminal transmit leg, and S representes safe short message service server recipient; PEc representes the public key encryption with C, and SIGs representes the private key signature with S,
The step that the session key agreement agreement is carried out is following:
The first step, the sending direction recipient sends the plaintext authentication request, and request content comprises that the terminal produces proof factor Nc;
Second step; Safe short message service server is searched the corresponding certificate of this user based on the phone number of portable terminal; And after this certificate legitimacy of certificate server checking; Produce a session key Kcs and proof factor Ns, utilize the encrypted public key of oneself private key and portable terminal Kcs, Ns, Nc are signed and to encrypt, pass to portable terminal then;
The 3rd step; Portable terminal carries out DecryptDecryption to the cipher-text information that the safety short message service server sends; Earlier test label, use self private key DecryptDecryption again, after the inspection Nc unanimity, Ns is passed to safe short message service server with plaintext with the PKI of the safe short message service server that prestores;
In the 4th step, after checking was passed through, portable terminal was passed to safe short message service server with Ns, and server compares Ns that receives and original Ns, confirms to consult successfully.
2. short message two-stage encryption transmission and method for secure storing based on the safety SIM according to claim 1; It is characterized in that: described short message encryption and decryption is handled and is meant that encrypted short message lands decryption processing and transmit with encrypting on the safety short message service server; Utilize session key to carry out the short message encryption and decryption and handle, the sending and receiving short messages step is following:
The first step; Terminal use A is to the terminal use B M that sends SMS message, and this message M uses the session key Kca that consults between user A and the safe short message service server to encrypt, and obtains message ciphertext C1; C1=EKca (M), C1 at first is sent to safe short message service server;
In second step, safe short message service server is received this ciphertext C1, to message C1 deciphering, obtains M, M=DKca (C1) with session key Kca;
In the 3rd step, safe short message service server is encrypted clear-text message M with the session key Kcb of user B, obtain ciphertext C2, C2=EKcb (M);
In the 4th step, safe short message service server sends to user B with ciphertext C2, and user B uses Kcb that C2 is deciphered, and obtains M, M=DKcb (C2);
Here E and D represent the encryption and decryption operation in the symmetric cryptography respectively;
So far short message M,, is existed with the ciphertext form in transmission course to user B by user A safe transmission all the time.
3. short message two-stage encryption transmission and method for secure storing based on the safety SIM according to claim 1; It is characterized in that: described short message is encrypted storage and is meant that it is following to use the encrypt file cabinet to encrypt storing step to there being the short message of encrypting storage demand to encrypt storage according to the organizational form of file cabinet:
The first step, set up the file cabinet structure: the memory space that safe SIM will block is divided into each group by the form of file cabinet;
Second step; The user is provided with file cabinet: the corresponding operator password of each file cabinet; Can only check the note in the affiliated encrypt file cabinet of own input operation password when checking note; If forget encrypt file cabinet operator password, need reset this document cabinet, delete All Files and information in this encrypt file cabinet simultaneously;
In the 3rd step, the note of receiving number is stored according to file cabinet, and the user has only the operator password of this cabinet correspondence of input just can check note.
CN200910227210A 2009-12-01 2009-12-01 Short message two-stage encryption transmission and secure storage method based on safety SIM card Active CN101720071B (en)

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CN102045669A (en) * 2010-12-01 2011-05-04 中兴通讯股份有限公司 Implementation method and system for encrypting short message services
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CN102291700A (en) * 2011-09-22 2011-12-21 郑州信大捷安信息技术股份有限公司 Method and system for enhancing safety of short messages of mobile terminal based on safety TF card
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