CN102098293B

CN102098293B - Method for previewing encrypted email

Info

Publication number: CN102098293B
Application number: CN 201010609595
Authority: CN
Inventors: 孙吉平; 韩勇
Original assignee: Beijing Senselock Software Technology Co Ltd
Current assignee: Beijing Senseshield Technology Co Ltd
Priority date: 2010-12-28
Filing date: 2010-12-28
Publication date: 2013-07-10
Anticipated expiration: 2030-12-28
Also published as: CN102098293A

Abstract

The invention provides a method for previewing an encrypted email, which comprises the following steps of: encrypting a cleartext mail by utilizing a key K1 generated by a mail client for a mail which is read for the first time; and when the mail is read again, decrypting by directly utilizing the saved key K1. Therefore, the reading speed of the encrypted email can be improved, and the problem that the mail reading speed is low by utilizing the universal serial bus (USB) KEY for decryption in the process of reading the encrypted email every time is effectively solved.

Description

The method for previewing of privacy enhanced mail

Technical field

The present invention relates to information security technology, particularly relate to a kind of method for previewing of privacy enhanced mail.

Background technology

Along with Internet development, increasing people uses Email to exchange, because the inadequate natural endowment of the Internet, give some lawless person's opportunities, they utilize virus, wooden horse or other rogue programs arbitrarily to invade others' computer, steal or revise others' Email, caused great loss to the user.

At present, mainly be to email encryption at these ways to solve the problem, by (for example: the USB key adopting intelligent key apparatus, be USB Key) mode carry out email encryption, specifically comprise: the Email Sender is encrypted with the mail of USB Key, the ciphertext mail is sent, and mail reception person uses the USB Key decrypting ciphertext mail of coupling.But, in the said method, when being read at every turn, privacy enhanced mail all needs to utilize USB KEY to be decrypted, even this mail is decrypted mistake when reading first, also needing to re-use USB KEY is decrypted, and the speed of the each deciphering of USB Key is very slow, and this can allow the user who frequently checks mail be difficult to stand.

This shows, said method in can the certified mail fail safe, the problem that prolongs when also existing Mail Preview.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of method for previewing of privacy enhanced mail, and this method can improve the preview speed of privacy enhanced mail.

In order to achieve the above object, the technical scheme of the present invention's proposition is:

A kind of method for previewing of privacy enhanced mail is characterized in that, this method may further comprise the steps:

A, Mail Clients judge whether the ciphertext mail copy of the privacy enhanced mail that current needs read is preserved, if having, and execution in step b then, otherwise, execution in step c;

B, described Mail Clients utilizes the random symmetric key K1 of current preservation, and described ciphertext mail copy is decrypted, and obtains corresponding expressly mail, withdraws from described method;

C, described Mail Clients utilize USB key USB KEY that described privacy enhanced mail is decrypted, and obtain corresponding expressly mail; When the head that reads seals mail, generate described random symmetric key K1 and preservation when described privacy enhanced mail is logined mailing system first for the user; Utilize the described random symmetric key K1 of current preservation, to described plaintext email encryption, obtain ciphertext mail copy and the preservation of described privacy enhanced mail.

In sum, the method for previewing of the privacy enhanced mail that the present invention proposes, for the mail that reads first, the key K 1 of utilizing Mail Clients self to generate is encrypted its plaintext mail, in order to directly utilize the key K 1 of self preserving to be decrypted when after this reading again, thereby can improve the reading speed of privacy enhanced mail, the slow problem of mail reading speed that all needs to utilize USB KEY to be decrypted when effectively having avoided each reading encrypted mail and cause.

Description of drawings

Fig. 1 is the schematic flow sheet of the embodiment of the invention one;

Fig. 2 is the schematic flow sheet of step 102 among Fig. 1;

Fig. 3 is the schematic flow sheet of step 103 among Fig. 1.

Embodiment

For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with the accompanying drawings and the specific embodiments.

Main thought of the present invention is: when logining mailing system first, at first generate a random symmetric key K1, and preserve this K1, to utilize K1 that the mail of having deciphered is encrypted later on, mail after encrypting is preserved as the mail copy, when reading before decrypted mail again, utilize the mail copy deciphering of K1 of current preservation to get final product, owing to utilize the decryption complexity of the mail copy of K1 much smaller than the complexity of utilizing the privacy enhanced mail original paper of USB KEY to be decrypted, therefore, can improve mail reception person to the reading speed of the non-privacy enhanced mail that reads first.

Fig. 1 is the schematic flow sheet of the embodiment of the invention one, and as shown in Figure 1, this method may further comprise the steps at least:

Step 101, Mail Clients judge whether the ciphertext mail copy of the privacy enhanced mail that current needs read is preserved, if having, then execution in step 102, otherwise, execution in step 103.

Here, when the ciphertext mail copy of privacy enhanced mail has been preserved, the decrypted mistake of this privacy enhanced mail is described, namely this to read not be to read this privacy enhanced mail first.At this moment, need change step 102 over to and utilize the random symmetric key K1 that generates before the Mail Clients, its mail copy is decrypted, thereby avoid utilizing the privacy enhanced mail original paper of USBKEY to be decrypted, thereby can improve the reading speed of privacy enhanced mail.

When the ciphertext mail copy of privacy enhanced mail is not preserved, the not decrypted mistake of this privacy enhanced mail is described, namely this is read as and reads this privacy enhanced mail first.At this moment, need change step 103 over to, after utilizing the privacy enhanced mail original paper of USB KEY to be decrypted, the random symmetric key K1 that utilizes Mail Clients to generate, its plaintext mail is encrypted, obtain ciphertext mail copy, so that when reading this privacy enhanced mail again afterwards, can utilize K1 that its ciphertext mail copy is decrypted, obtain the plaintext mail of this privacy enhanced mail, thus the mail reading speed slow problem of utilizing the privacy enhanced mail original paper deciphering of USB KEY to cause when reading this privacy enhanced mail after having avoided.

Step 102, described Mail Clients utilizes the random symmetric key K1 of current preservation, and described ciphertext mail copy is decrypted, and obtains corresponding expressly mail, withdraws from described method.

In actual applications, in order to improve fail safe, can utilize the K1 of USB KEY to encrypt earlier, and then preserve.Particularly, this step can adopt following method to realize:

Step 201, judge the described K1 of current whether buffer memory, if then execution in step 202, otherwise execution in step 203.

Here, if buffer memory mistake not, illustrate that the current privacy enhanced mail that reads is that this head that reads when logining this Mail Clients of user seals mail, then need to be decrypted and buffer memory by step 203 couple K1 earlier, so that after this, directly utilize the ciphertext mail of the K1 copy of buffer memory to be decrypted, thereby make when the mail that other once were read the time is read in this login again, do not need to decipher again K1, and then improve the mail reading speed.

Step 202, utilize the described random symmetric key K1 of buffer memory, described ciphertext mail copy is decrypted, obtain corresponding expressly mail, withdraw from described method.

Step 203, utilize the described K1 after described USB KEY deciphers the encryption of current preservation, described K1 and buffer memory after obtaining deciphering utilize the described K1 after the deciphering that described ciphertext mail copy is decrypted, and obtain corresponding expressly mail, withdraw from described method.

Step 103, described Mail Clients utilize USB KEY that described privacy enhanced mail is decrypted, and obtain corresponding expressly mail; When the head that reads seals mail, generate described random symmetric key K1 and preservation when described privacy enhanced mail is logined mailing system first for the user; Utilize the described random symmetric key K1 of current preservation, to described plaintext email encryption, obtain ciphertext mail copy and the preservation of described privacy enhanced mail.

Particularly, step 103 can adopt following method to realize:

Step 301, described Mail Clients utilize USB KEY that described privacy enhanced mail is decrypted, and obtain corresponding expressly mail.

Step 302, judge the described K1 of current whether buffer memory, if then execution in step 303, otherwise execution in step 304.

Step 303, utilize the described K1 of buffer memory to encrypt described plaintext mail, obtain the ciphertext mail copy of described privacy enhanced mail and be kept on the non-volatile memory medium, withdraw from described method.

Step 304, judge whether to preserve the described K1 that utilizes after described USB KEY encrypts, if then execution in step 305, otherwise execution in step 306.

Step 305, utilize described USB KEY that the described K1 after encrypting is decrypted, described K1 and buffer memory after obtaining deciphering, utilize the described K1 after deciphering to encrypt described plaintext mail, obtain the ciphertext mail copy of described privacy enhanced mail and be kept on the non-volatile memory medium, withdraw from described method.

Here, can obtain ciphertext mail copy when logining Mail Clients for the ease of next time, therefore, it is kept on the non-volatile memory medium.

Step 306, the described random symmetric key K1 of generation and buffer memory, utilize described K1 to encrypt described plaintext mail, obtain the ciphertext mail copy of described privacy enhanced mail and be kept on the non-volatile memory medium, utilize described USB KEY to encrypt described K1 and be kept on the non-volatile memory medium, withdraw from described method.

Here, therefore the K1 after can obtaining when logining Mail Clients for the ease of next time to encrypt, is kept at it on non-volatile memory medium.

In sum, more than be preferred embodiment of the present invention only, be not for limiting protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. the method for previewing of a privacy enhanced mail is characterized in that, this method may further comprise the steps:

2. method according to claim 1 is characterized in that, described step b comprises:

B1, judge the described K1 of current whether buffer memory, if, execution in step b2 then, otherwise execution in step b3;

B2, utilize the described random symmetric key K1 of buffer memory, described ciphertext mail copy is decrypted, obtain corresponding expressly mail, withdraw from described method;

B3, utilize the described K1 after described USB KEY deciphers the encryption of current preservation, described K1 and buffer memory after obtaining deciphering utilize the described K1 after the deciphering that described ciphertext mail copy is decrypted, and obtain corresponding expressly mail, withdraw from described method.

3. method according to claim 1 and 2 is characterized in that, described step c comprises:

C1, described Mail Clients utilize USB KEY that described privacy enhanced mail is decrypted, and obtain corresponding expressly mail;

C2, judge the described K1 of current whether buffer memory, if, execution in step c3 then, otherwise execution in step c4;

C3, utilize the described K1 of buffer memory to encrypt described plaintext mail, obtain the ciphertext mail copy of described privacy enhanced mail and be kept on the non-volatile memory medium, withdraw from described method;

C4, judge whether to preserve the described K1 that utilizes after described USB KEY encrypts, if, execution in step c5 then, otherwise execution in step c6;

C5, utilize described USB KEY that the described K1 after encrypting is decrypted, described K1 and buffer memory after obtaining deciphering, utilize the described K1 after the deciphering to encrypt described plaintext mail, obtain the ciphertext mail copy of described privacy enhanced mail and be kept on the non-volatile memory medium, withdraw from described method;

C6, the described random symmetric key K1 of generation and buffer memory, utilize described K1 to encrypt described plaintext mail, obtain the ciphertext mail copy of described privacy enhanced mail and be kept on the non-volatile memory medium, utilize described USB KEY to encrypt described K1 and be kept on the non-volatile memory medium, withdraw from described method.