Method and apparatus for managing cryptographic keys

Details Method and apparatus for managing cryptographic keys Method and apparatus for managing cryptographic keys

2011-04-12

2011-04-12

Zand, Kambiz (Department: 2434)

Cryptography

Key management

Key distribution

C380S277000, C380S286000

Reexamination Certificate

active

07925023

ABSTRACT:
One embodiment of the present invention provides a system for managing keys. During operation, the system authenticates a client at a key manager. Next, the system receives a token from the client at the key manager, wherein the token is associated with a customer key, and includes a token authenticator. This token authenticator comprises one-half of an authenticator pair which is used to determine if the client is the owner of the customer key. Next, the system decrypts the token using a master key. The system then verifies a client authenticator, which comprises the other half of the authenticator pair which is used to determine if the client is the owner of the customer key. If the client is the owner of the customer key, the system sends the customer key to the client, which enables the client to encrypt/decrypt data. Finally, the client deletes the customer key.

REFERENCES:
patent: 7415721 (2008-08-01), Fransdonk
patent: 2003/0063750 (2003-04-01), Medvinsky et al.

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