Authenticated read-only memory

Details Authenticated read-only memory Authenticated read-only memory

1987-04-21

1988-07-12

Chan, Eddie P.

Boots, shoes, and leggings

380 4, G06F 758

Patent

active

047574682

ABSTRACT:
An apparatus for controlling access to a program stored in a read-only memory is described. In one embodiment, the memory includes a random number generator and an encryptor for encrypting random numbers from the generator. A second encryptor which provides identical encryption to the first encryptor is included within the system and is coupled to receive random numbers from the generator. A comparator compares the results from the first and second encryptors and if they are identical, enables the memory. The encryptors are programmable with a 64-bit key and 32-bit random numbers are used. By making the encryption process relatively slow (e.g., one second) many decades are required to break the key.

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