Appeal 2007-0644
Application 10/081,500
INTRODUCTION
The claims relate to a method and system for authentication of a user
by an authenticating entity. The authenticating entity sends a challenge (e.g,
a bit sequence) to the user, to which the user adds a spoiler (e.g., an
additional bit sequence). The user encrypts the combined spoiler and
challenge using a private key of an asymmetric key pair. Claim 1 is
illustrative:
1. A method for authentication of a user by an authenticating entity
comprising the steps of:
the authenticating entity sending a challenge to the user;
the user adding a spoiler to the challenge;
the user encrypting the combined spoiler and challenge using a private
key of an asymmetric key pair;
the user sending a response to the authenticating entity in the form of
the encrypted combined spoiler and challenge.
The Examiner relies on the following prior art references to show
unpatentability:
Tsudik US 6,072,875 Jun. 6, 2000
Andersson US 2002/0034301 A1 Mar. 21, 2002
Hara US 2004/0202328 A1 Oct. 14, 2004
The rejections as presented by the Examiner are as follows:
1. Claims 1-5 and 11-14 are rejected under 35 U.S.C. § 103(a) as
unpatentable over Andersson and Hara.
2. Claims 6-10 are rejected under 35 U.S.C § 103(a) as unpatentable
over Andersson, Hara, and Tsudik.
2
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