System and method for comparison of private values

Details System and method for comparison of private values System and method for comparison of private values

2011-01-11

2011-01-11

Colin, Carl (Department: 2433)

Cryptography

Communication system using cryptography

C380S028000, C705S050000

Reexamination Certificate

active

07869598

ABSTRACT:
An embodiment includes a first system for computing a contribution to a greater-than comparison of a first private value and a second private value. The first system includes: an accessing unit configured to access the first private value; a processor unit configured to compute a first encrypted value by encrypting the first private value, compute a decrypted value by decrypting a third encrypted value, and compute a contribution to a result of the greater-than comparison by checking a relation between the decrypted value and a modulus value; and a communication unit configured to send the first encrypted value to a second system and to receive the third encrypted value.

REFERENCES:
patent: LNCS 3531 (2005-06-01), None
patent: WO-2005043808 (2005-05-01), None
“European Search Report for Application No. 06000007.2-2415”, (Jul. 3, 2006),7 pgs.
Lin, Hsiao-Ying , et al., “An efficient solution to the millionaires' problem based on homomorphic encryption”,ACNS 2005 : Applied Cryptography and Network Security, Lecture notes in computer science, (2005),456-466.

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