Authenticated read-only memory
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United States of America Patent
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-
Jul 12, 1988
Issued Date -
N/A
app pub date -
Apr 21, 1987
filing date -
Sep 22, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
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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