Implementation method for ensuring secure storage of electronic mails

Abstract

The invention provides an implementation method for ensuring secure storage of electronic mails, which comprises the following steps of: (1) when a mailbox is registered, generating a unique random string r for a user, and storing the random string r; (2) when the user receives the mails, accessing the random string r, generating symmetric keys K by using a key generating algorithm H, then encrypting mail plaintexts by using a symmetric algorithm F to generate encrypted mail texts, and storing the encrypted mail texts; and (3) when the user reads the mails of the mailbox, accessing the random string r, generating symmetric keys k by using the same key generating algorithm H, and finally decrypting the encrypted mail texts by using the symmetric algorithm F. The server-based mail encryption and storage technology has a trigger occasion of an encryption mechanism after the mails reach the server and before the mails are stored in a local hard disk. High-strength symmetric encryption algorithms are adopted in the technology, different users encrypt and decrypt the mails in the mailbox by using different randomly-generated keys, and a high flexible encryption control scheme is formed by means of encryption of the mails.

Description

technical field [0001] The invention relates to e-mail security, in particular to a realization method of a server-based e-mail security storage technology. Background technique [0002] Now the transmission of e-mail is carried out through the mail delivery agent server. On the one hand, the mail delivery agent provides a local delivery agent to store the mail on the disk. On the other hand, it provides the IMAP / POP3 protocol server for reading the mail and sending it. For the client agent of the mail, after a mail is transmitted to the destination server through the mail transfer agent, the local delivery agent will be started to store the mail on the server until the user receives the mail through the POP protocol, or manages the mail with the IMAP protocol . Since the mail is stored on the server in the form of a file, a system user (such as an administrator) who has obtained the read permission of the mail file can read the letters in the mail user's inbox arbitrarily,...

AI Technical Summary

Problems solved by technology

Since the mail is stored on the server in the form of a file, a system user (such as an administrator) who has obtained the read permission of the mail file can read the letters in the mail user's inbox arbitrarily, so the security of the mail during storage on the mail server not guaranteed

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