Data encryption and decryption

Details Data encryption and decryption Data encryption and decryption

2007-01-30

2007-01-30

Revak, Christopher (Department: 2131)

Electrical computers and digital processing systems: support

Data processing protection using cryptography

C380S255000

Reexamination Certificate

active

10193568

ABSTRACT:
In a computer processing apparatus, when writing data to, and/or reading data from, memory, one or more instruction bits are associated with the memory address for the data to specify how encryption or decryption is to be performed. The bit(s) may be part of the memory address or separate therefrom, for example as a data header. Multiple data paths provided to write data to, and read data from, memory. On at least one of the paths is hardware operable to perform encryption or decryption. Preferably at least one path is a non-encryption/decryption path. The path to be used to write the data to, or read the data from, memory is chosen in accordance with the instruction bits associated with the memory address.

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