Data processing: financial – business practice – management – or co – Business processing using cryptography – Secure transaction
Reexamination Certificate
2004-08-20
2010-10-26
Hewitt, II, Calvin L (Department: 3685)
Data processing: financial, business practice, management, or co
Business processing using cryptography
Secure transaction
C705S064000
Reexamination Certificate
active
07822689
ABSTRACT:
The present invention discloses a method and system for maintaining privacy for transactions performable by a user device having a security module with a privacy certification authority and a verifier. The system comprises an issuer providing an issuer public key PKI; a user device having a security module for generating a first set of attestation-signature values DAA1; a privacy certification authority computer for providing an authority public key PKPCA and issuing second attestation values AV2; and a verification computer for checking the validity of the first set of attestation-signature values DAA1with the issuer public key PKI and the validity of a second set of attestation-signature values DAA2with the authority public key PKPCA, the second set of attestation-signature values DAA2being derivable by the user device20from the second attestation values AV2, wherein it is verifiable that the two sets of attestation-signature values DAA1, DAA2relate to the user device.
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Alexanian Vazken
Cantor & Colburn LLP
Hewitt II Calvin L
International Business Machines - Corporation
Nigh James D
LandOfFree
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