Group key distribution

Cryptography – Key management – Key distribution

Patent

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Details

380281, 380282, 713155, 713156, 713163, H04L 908, H04L 930, H04L 932, H04K 102

Patent

active

060383224

ABSTRACT:
A method for distributing a secret key from a key holder H to intended group members M. The method assumes that during the distribution process each party, a group member M and the key holder H, can decrypt and encrypt exchanged information such that the encrypter knows that the decrypter will be the intended party. The method preferably uses a public key/private key encryption technique in which, for example, a trusted Certificate Authority in a public key infrastructure signs the certificates to provide the public keys involved in the encryption. Alternatively, the method, together with a symmetric cipher, uses a shared secret, established in an authenticated mechanism that is outside the information exchanges of the invention. Additionally, the method uses a strong mixing function that takes several items of data as input and produces a pseudo-random authentication (or digest). Inputs to the mixing function include identity stamps that are generated by each member M and key holder H. These inputs can be the identity of the stamp generator, such as a network address, port, or protocol, a timestamp, and/or a secret value that is known only to the stamp generator. The stamps include information to bind member M if generated by key holder H, and to bind key holder H if generated by member M. Consequently, the invention authenticates each communication exchange between member M and key holder H.

REFERENCES:
patent: 4956863 (1990-09-01), Goss
patent: 5729608 (1998-03-01), Janson et al.
patent: 5889865 (1999-03-01), Vanstone et al.
Zheng, Y. and Imai, H., "Compact and Unforgeable Key Establishment over an ATM Network," in INFOCOM '98. 17th Conf. IEEE Computer and Communications Societies, Apr. 2, 1998, pp. 411-418.
H. Harney et al., "Group Key Management Protocol (GKMP) Specification," Jul. 1997, http://info.internet.isi.edu/in-notes/rfc/files/rfc2093.txt, pp. 1-18.
H. Harney et al., "Group Key Management Protocol (GKMP) Architecture," Jul. 1997, http://info.internet.isi. edu/in-notes/rfc/files/rfc2094.txt, pp. 1-17.

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