Encrypting and decrypting instruction boundaries of instructions

Details Encrypting and decrypting instruction boundaries of instructions Encrypting and decrypting instruction boundaries of instructions

1996-08-05

1998-03-03

Cain, David C.

Cryptography

Cryptanalysis

380 49, H04K 100

Patent

active

057244227

ABSTRACT:
A data processing system for decoding instructions in parallel in a superscalar, complex instruction set computing (CISC) computer. In a training mode of operation, an encrypter 29 encrypts preprocessed instructions retrieved from an instruction cache 26. In a processing mode of operation, instruction information is fetched and decrypted in decrypter 30. A prefetcher 21 separates the fetched instruction according to the decrypted boundary information. An instruction length verifier 25 verifies that the instructions were separated correctly and controls decoders 22a-c according to the verification. If the verification is correct for a given set of instructions, the system processes the instructions in parallel through the decoders to a dispatch logic circuit 23 and then to functional units 24. If the verification is incorrect, those related instructions may be needed to decode serially.

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