Method and apparatus for performing a secure operation

Details Method and apparatus for performing a secure operation Method and apparatus for performing a secure operation

1997-05-15

2000-08-08

Swann, Tod R.

Electrical computers and digital processing systems: support

Data processing protection using cryptography

713200, H04K 100

Patent

active

061016055

ABSTRACT:
To perform a secure operation, an original encrypted value is obtained from a memory. The original encrypted value is decrypted to obtain an original value and an original validity code. The original validity code is compared with a stored validity code. If the original validity code is equivalent to the stored validity code, the secure operation is performed on the original value to produce a new value. Then a permanent alteration is made to the stored validity code to produce a new stored validity code. The new value and the new stored validity code are encrypted to produce a new encrypted value. The new encrypted value is stored in the memory.

REFERENCES:
patent: 5452355 (1995-09-01), Coli
patent: 5481672 (1996-01-01), Okuno et al.
patent: 5825875 (1998-10-01), Ugon

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