Appeal No. 2003-0033
Application No. 09/186,546
BACKGROUND
Appellants’ invention relates to a secure memory management unit which uses
multiple cryptographic algorithms. An understanding of the invention can be derived
from a reading of exemplary claim 1, which is reproduced below.
1. A method by which an integrated circuit accesses first encrypted
data stored in a first external memory and accesses second encrypted
data stored in a second external memory, the first external memory and
the second external memory being external to the integrated circuit, the
method comprising the following steps:
(a) when accessing a first portion of the first encrypted data stored
in the first external memory, performing the following substep:
(a.1) using a first algorithm to decrypt the first portion of the
first encrypted data, decryption using the first algorithm being performed
within the integrated circuit; and,
(b) when accessing a first portion of the second encrypted data
stored in the second external memory, performing the following substep:
(b.1) using a second algorithm to decrypt the first portion of
the second encrypted data, decryption using the second algorithm being
performed within the integrated circuit, wherein the second algorithm is
different than the first algorithm.
The prior art references of record relied upon by the examiner in rejecting the
appealed claims are:
Abadi et al. (Abadi) 5,268,962 Dec. 7, 1993
Sourgen et al. (Sourgen) 5,850,452 Dec. 15, 1998
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