Message authentication device

Details Message authentication device Message authentication device

2003-11-12

2011-10-25

Reza, Mohammad W (Department: 2436)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

C713S170000, C713S175000, C713S181000, C726S010000, C726S020000, C725S006000

Reexamination Certificate

active

08046584

ABSTRACT:
Method for checking the signature of a message. The message, signature, and a certificate are sent by a signer having a public key to a recipient having a message storage device. The certificate is checked by a protected device connected to the message storage device and a checking result data element is sent for checking to a display device connected to the protected 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. The signature is decrypted using the public key in the protected device, and the decrypted signature is compared with the reduction carried out. According to the comparison, a message is sent from the protected device to the display device indicating whether the signature conforms or does not conform to the message or to the public key of the signer put forward.

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