Revision as of 13:10, 14 November 2006 edit Alex Cohn (talk \| contribs) Extended confirmed users, Pending changes reviewers, Rollbackers 16,593 edits m →Examples of Use: typo fix ← Previous edit		Revision as of 16:37, 3 April 2007 edit undo 128.220.254.84 (talk) added more references Next edit →
Line 6: 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 [[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 ~~revealing~~revelaing either of the keys or the underlying plaintext to the proxy, this method is not ideal. ==Defining Functions== Line 19: Proxy re-encryption should not be confused with [[proxy signatures]], which is a separate construction with a different purpose. ==~~External links~~References== * M. Blaze, G. Bleumer, M. Strauss. [http://link.springer.de/link/service/series/0558/bibs/1403/14030127.htm Divertible Protocols and Atomic Proxy Cryptography]. Bertino, E., Sandhu, R. [http://ieeexplore.ieee.org/search/wrapper.jsp?arnumber=1416861 "Database security - concepts, approaches, and challenges."] <u>IEEE Transations on Dependable and Secure Computing</u> 2 (2005): 2-19 G. Ateniese, K. Fu, M. Green, S. Hohenberger. [http://spar.isi.jhu.edu/~mgreen/proxy.pdf Improved Proxy Re-encryption Schemes with Applications to Secure Distributed Storage]. Proceedings of the 12th Annual Network and Distributed Systems Security Symposium (NDSS 2005), San Diego, California, 2005. M. Green, G. Ateniese. [http://eprint.iacr.org/2006/473 Identity-Based Proxy Re-encryption]. Applied Cryptography and Network Security Conference, June 2007. S. Hohenberger, G. Rothblum, a. shelat, and V. Vaikuntanathan. Securely Obfuscating Re-encryption. Proceedings of the Theory of Cryptography Conference (TCC), 2007. *[http://spar.isi.jhu.edu/~mgreen/prl/ The JHU-MIT Proxy Re-cryptography Library] [[Category:Cryptography]]

Proxy re-encryption: Difference between revisions