Appeal No. 2005-0986
Application No. 09/727,904
blinded ciphertext technique, but does disclose, at column 13,
lines 48-52, receiving from the user a first ciphertext portion
of the signed ciphertext, and, at column 3, lines 16-61, and, at
column 11, lines 15-67, that the user receives this in
conjunction with a request from the user for purchase of the
given information item from the merchant. The examiner further
contends that Nishioka discloses, at column 2, lines 33-67, and
column 7, lines 42-62, decrypting the first ciphertext portion
and returning to the user the resulting decrypted version of the
first ciphertext portion, wherein the resulting decrypted portion
provides information that is utilized by the user in conjunction
with accessing the given information item in a manner such that
the merchant is unable to identify the given information item
purchased by the user.
In order to supply the alleged deficiency in Nishioka, the
examiner turns to Kyojima for authenticating and controlling
access to digital data by applying a blinding effect and
decryption technique to ciphertext that can securely transmit a
specific piece of information to a decryption device while
keeping the blindness of the data to be delegated (pointing to
column 4, lines 57-65, column 6, lines 1-7, and 33-45, and column
8, lines 5-41, of Kyojima). The examiner alleges that Kyojima
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