Proxy re-encryption: Difference between revisions

Revision as of 15:31, 24 July 2006

Revision as of 18:31, 19 August 2006

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==Examples of Use==

Bob could designate a proxy to re-encrypt one of his messages that is to be sent to Chris. This generates a new [[Key (cryptography)|key]] that Chris can use to decrypt the message. Now if Alice sends Chris a message that was encrypted under Bob's key, the proxy will alter the message, allowing Chris to decrypt it. This method allows for a number of applications such as email[[e-mail forwarding]], law-enforcement monitoring, and content distribution.

A weaker re-encryption scheme is one in which the proxy possesses both parties' keys simultaneously. One key decrypts a [[plaintext]], while the other encrypts it. Since the goal of many proxy re-encryption schemes is to avoid revelaing either of the keys or the underlying plaintext to the proxy, this method is not ideal.