Appeal No. 2003-1942 Page 9
Application No. 09/260,796
combination of binary digits is utilized to form the key for operating the cryptographic
device that develops [a] first cipher block. Then, a portion of the first cipher block is
stored and the remaining portion is combined with the same randomly generated binary
digits to form a second ciphertext. The second ciphertext and the stored portion of the
first cipher text are then combined to form a new composite cipher block that
is transmitted." Col. 2, ll. 30-42. Furthermore, we agree with the examiner that
"Carter's elaborat[ion] that the user inputs a user identifier and password; the member
definitions of the collaborative document are searched in order to locate the member
identifier corresponding to the user identifier," (Examiner's Answer at 13), constitutes an
access formula expressing a logical combination of at least one group for which access
to information will be granted.
The examiner does not allege, let alone show, that the teachings from Carter and
Feistel would have suggested using the Carter's member definitions and public key for
each group granted access to the information to encrypt asymmetrically Feistel's
random combination of binary digits. Absent a teaching or suggestion of using an
access formula and the public key for each group granted access to information to
encrypt asymmetrically a randomly generated number, we are unpersuaded of a prima
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