Secure storage of private keys

Details Secure storage of private keys Secure storage of private keys

2005-09-27

2005-09-27

Rimell, Sam (Department: 2164)

Cryptography

Key management

Key escrow or recovery

C380S281000, C380S277000, C713S194000, C707S793000

Reexamination Certificate

active

06950523

ABSTRACT:
To protect a private cryptographic key, two values are derived. The two values together can reconstruct the key. One value is sent to a server and deleted from the local machine. The other value is held by the local machine. To use the key, the user will enter a password, which will be used to authenticate the user to the server, and retrieve the value from the server. The password is also used to unlock the value held by the local machine. The private cryptographic key is thus protected against brute force password attacks without changing the behavior of the user.

REFERENCES:
patent: 5418854 (1995-05-01), Kaufman et al.
patent: 5604801 (1997-02-01), Dolan et al.
patent: 5774552 (1998-06-01), Grimmer
patent: 6230269 (2001-05-01), Spies et al.
patent: 2002/0178370 (2002-11-01), Gurevich et al.

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