Appeal 2007-0246
Application 09/854,251
BACKGROUND
Appellant’s invention relates to a message authentication system and
method using a single iteration of a keyed compression function when a
message fits within the input block. For larger messages, the method and
system additionally uses a nested hash function. An understanding of the
invention can be derived from a reading of exemplary claim 1, which is
reproduced below.
1. A method of processing a message for authentication, said method
comprising:
determining whether said message fits within an input block of a
compression function;
performing a single iteration of the compression function using a key
and said message as inputs when said message fits within an input block of
said compression function and using a result from said compression function
without further iteration thereof to produce a message authentication code;
and
using a hash function nested within a keyed hash function to process
said message when said message does not fit within an input block of said
compression function and using a result from said keyed hash function to
produce a message authentication code. ,
PRIOR ART
The prior art reference of record relied upon by the Examiner in
rejecting the appealed claims is:
2
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