Crytographic device with secure testing function

Details Crytographic device with secure testing function Crytographic device with secure testing function

1995-08-30

1997-03-04

Cain, David C.

Cryptography

Equipment test or malfunction indication

H04K 100

Patent

active

056087985

ABSTRACT:
A method of securely testing a cryptographic device need not be carried out in a secure testing facility by cleared personnel. First, a test cycle total count number is provided. Then, for each of a plurality of test cycles, the number being determined from the test cycle total count number, an input data signal is provided to the cryptographic device. The input data signal is encrypted to determine an encrypted signal, and the encrypted signal is then decrypted to determine a decrypted signal. Finally, the input data signal is compared to the decrypted signal. A cryptographic device includes receiving circuitry for receiving the input data signal and encryption circuitry that encrypts the input data signal to determine the encrypted signal. Decryption circuitry decrypts the encrypted signal to determine a decrypted signal, and comparing circuitry compares the input data signal to the decrypted signal. Finally, sequencing circuitry causes a plurality of input data signals to he sequentially provided to the receiving circuitry during a plurality of test cycles, one input data signal per test cycle.

REFERENCES:
patent: 5432848 (1995-07-01), Butter et al.

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