Cryptographically protected paging subsystem

Details Cryptographically protected paging subsystem Cryptographically protected paging subsystem

1996-12-12

1998-05-26

Gregory, Bernarr E.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 4, 380 21, 380 23, 380 30, 380 49, 380 50, H04L 900

Patent

active

057579199

ABSTRACT:
A method and system for maintaining integrity and confidentiality of pages paged to an external storage unit from a physically secure environment. An outgoing page is selected to be exported from a physically secure environment to an insecure environment. An integrity check value is generated and stored for the outgoing page. In one embodiment, this takes the form of taking a one-way hash of the page using a well-known one-way hash function. The outgoing page is then encrypted using a cryptographically strong encryption algorithm. Among the algorithms that might be used in one embodiment of the invention are IDEA and DES. The encrypted outgoing page is then exported to the external storage. By virtue of the encryption and integrity check, the security of the data on the outgoing page is maintained in the insecure environment.

REFERENCES:
patent: 5007083 (1991-04-01), Constant
patent: 5343527 (1994-08-01), Moore
E. Palmer, "An Introduction to Citadel--A Secure Crypto Coprocessor for Workstations," IBM Thomas J. Watson Research Center, Version 1.00, Sep. 30, 1992.
B. Yee, "Using Secure Coprocessors," School of Computer Science, Carnegie Mellon University, May 1994.
"VMS320--High Speed PCMCIA Security Token Cryptographic Engine," VLSI Technology, Inc., 1997.

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