Novel identity-based privacy enhanced mail forwarding system

A forwarding system, mail technology, applied in transmission systems, digital transmission systems, electrical components, etc.
CN101710879AInactive Publication Date: 2010-05-19COMMUNICATION UNIVERSITY OF CHINA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
COMMUNICATION UNIVERSITY OF CHINA
Publication Date
2010-05-19
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a novel identity-based privacy enhanced mail forwarding system, which belongs to the field of communication. A method comprises the following steps of: selecting system parameters according to system security requirements, and generating a system master private key (namely the private key of a private key generation center PKG); receiving a user registration application by the PKG, and generating a private key for a user according to an e-mail address selected by the user; generating a first-stage encrypted e-mail according to the e-mail address of the user; generating a re-encrypted private key according to the system parameters; generating a second-stage encrypted e-mail according to the first-stage encrypted e-mail and the re-encrypted private key, and forwarding the second-stage encrypted e-mail; and decrypting the first-stage or the second-stage encrypted e-mail according to the private key of the user. The novel identity-based privacy enhanced mail forwarding system is realized on the basis of the bilinear pairing defined on an elliptic curve, uses a novel random filling mode to ensure the non-scalability of a cipher text, and enhances the security of the first-stage and the second-stage encrypted e-mails.
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Description

technical field

[0001] The present invention generally relates to encryption, re-encryption, forwarding and decryption for mail systems, and more specifically relates to the use of an identity-based proxy re-encryption system as a cryptographic tool to realize forwarding of confidential mail.

[0002] Terminology Explanation

[0003] The meaning of confidential mail: the content of the mail is encrypted.

[0004] Identity-based meaning: the encryption key is the target email address itself (and because of this, the system does not require a public key infrastructure, PKI), but the decryption key is created by a trusted private key generator (PKG) for each Generated by registered users.

[0005] The meaning of confidential email forwarding: It was originally a confidential email sent to user A (such as a manager). Due to some reasons (such as business trips, etc.), A did not care about decrypting and processing this email; but before that, A opened the automatic forwarding se...

Claims

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