Data processing: financial – business practice – management – or co – Business processing using cryptography – Secure transaction
Reexamination Certificate
2008-03-18
2008-03-18
Nguyen, Nga (Department: 3692)
Data processing: financial, business practice, management, or co
Business processing using cryptography
Secure transaction
C705S016000, C705S017000, C705S018000, C705S041000, C705S065000, C705S067000, C380S030000, C380S046000, C380S051000, C380S259000, C380S277000, C713S155000, C713S159000, C713S167000, C713S168000, C713S170000, C713S176000, C713S182000, C713S189000
Reexamination Certificate
active
09517384
ABSTRACT:
This invention concerns a validation protocol for determining whether an untrusted authentication chip is valid, or not. The protocol may be used to determine the physical presence of a valid authentication chip and from that determine whether a consumable containing the chip is valid. In another aspect the invention also concerns a system for validating the chip. A random number is generated and encrypted with an asymmetric encryption function. It is then passed to an untrusted authentication chip where it is decrypted. The decrypted random number is then compared with the original random number, and in the event of a match the untrusted chip is considered to be valid.
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Nguyen Nga
Silverbrook Research Pty Ltd
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