Method for providing blind access to an encryption key

Details Method for providing blind access to an encryption key Method for providing blind access to an encryption key

1995-03-09

1996-10-08

Tarcza, Thomas H.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 45, H04L 100

Patent

active

055641067

ABSTRACT:
Blind access (100, 300, 400) to a desired encryption key of a predetermined first group member is provided to a second group. The first group encrypts a plurality of first group member encryption keys using a predetermined algorithm and transfers to the second group, the encrypted plurality of first group member encryption keys with corresponding unencrypted first group member identification fields, IDs, and a list of IDs corresponding to the first group members. The desired ID-free encryption key is selected and encrypted by the second group using a predetermined algorithm. The doubly encrypted key is transferred to the first group, decrypted by the first group and transferred to the second group for decryption. Thus, the encryption key is provided without knowledge to the first group of which member's encryption key is being examined and with knowledge to the second group of only the desired encryption key.

REFERENCES:
patent: 4405829 (1983-09-01), Rivest et al.
J. L. Massey, "Contemporary Cryptology: An Introduction," in Contemporary Cryptology: The Science of Information Integrity, G. J. Simmons, ed., IEEE Press, 1992, pp. 32-35.
Bruce Schneir, "Applied Cryptography: Protocols, Algorithms, and Source Code in C", 2nd edition John Wiley and Sons, N.Y. pp. 516-517 Section 22.3 .

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