Encryption and verification using partial public key

Details Encryption and verification using partial public key Encryption and verification using partial public key

2006-03-09

2010-02-16

Barron, Jr., Gilberto (Department: 2432)

Cryptography

Particular algorithmic function encoding

Public key

C380S044000, C380S283000, C380S285000

Reexamination Certificate

active

07664259

ABSTRACT:
A method and device for using a partial public key in a cryptosystem. The cryptosystem may be based on a group, such as an elliptic curve over a finite field. The device includes a first memory for storing system parameters of the cryptosystem and a second memory for storing a portion of a public key of the cryptosystem. The device receives the complete public key, or the remainder of the public key, via communication with another device. The received portion of the public key is used to form a validated public key. A processor of the device uses the validated public key for encrypting messages and/or verifying signatures. The size of the second memory is reduced since only part of the public key is stored.

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Philippe Becamel, “PCT/US2007/061895 - PCT International Preliminary Report on Patentability,” The International Bureau of WIPO, Geneva Switzerland, Sep. 18, 2008.

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