Method for verifying a message signature

Details Method for verifying a message signature Method for verifying a message signature

2006-05-02

2006-05-02

Barrón, Jr., Gilberto (Department: 2132)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

C713S173000

Reexamination Certificate

active

07039808

ABSTRACT:
Method for checking the signature of a message, the message, signature, and a certificate having been sent by a signer having a public key to a recipient having a message storage device. According to the invention, the method includes the stages according to which: the certificate in the protected device connected to the storage device of the recipient and checked and at least one checking result data element is sent to a display device connected directly to the protected device, the result data element is checked on the display device, when the certificate is verified, a reduction of the message is calculated in the protected device and the message is recopied onto the display device during the reduction operation, the signature with the public key of the signer is decrypted in the protected device, and the decrypted signature is compared with the reduction carried out, according to the result of the comparison, a message is sent from the protected device to the display device indicating that the signature conforms/does not conform to the message or to the public key of the signer put forward.

REFERENCES:
patent: 4529870 (1985-07-01), Chaum
patent: 6170058 (2001-01-01), Kausik
patent: 0 785 514 (1997-07-01), None
patent: WO 99/08415 (1999-02-01), None
Preneel, “Cryptographic Hash Functions,” European Transactions on Telecommunications and Related Technologies; vol. 5, Jul./Aug. (1994), No. 4, pp. 17-34.

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