Appeal 2007-0930
Application 10/014,763
1 INVENTION
2 The invention is directed to a method of generating secure digital
3 signatures with user devices that have limited computational resources (i.e.
4 mobile phone, PDA etc). The user device of limited computational
5 resources generates a first digital signature which can be generated easily;
6 this digital signal is transmitted through an intermediary to a verification unit
7 which after verifying the first digital signature, generates and transmits a
8 second more computationally complex digital signature. See page 3 of
9 Appellants’ Specification. Claim 1 is representative of the invention and
10 reproduced below:
11 1. A method for use in generating digital signatures in an information
12 processing system, the system including at least a user device, an
13 intermediary device and a verifier, the method comprising the steps of:
14
15 generating in the user device a first digital signature; and
16
17 sending the first digital signature to the verifier;
18
19 wherein the verifier sends the first digital signature to the intermediary
20 device, and the intermediary device checks that the first digital
21 signature is a valid digital signature for the user device and if the first
22 digital signature is valid generates a second digital signature which is
23 returned to the verifier as a signature generated by the user device.
24
25
26 REFERENCES
27 The references relied upon by the Examiner are:
28 Micali US 5,016,274 May 14, 1991
29 Aura US 6,711,400 B1 Mar. 23, 2004
30 (filed Oct. 14, 1999)
2
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