Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1994-06-07
1995-12-12
Cain, David C.
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
380 21, 380 23, H04K 100
Patent
active
054757576
ABSTRACT:
A method of secure data transmission commences at a sending or originating terminal by processing a sender challenge on an originating subscriber card with a secret originating subscriber coding key to obtain an originating subscriber response. The response is used at the originating terminal to encrypt the message to be securely transmitted. The thus-encrypted message is transmitted, together with the sender challenge in its original form, to a system server. The server retrieves the originating subscriber coding key from a repository to which it has access, and uses the key to generate a response that is identical to that produced by the originating subscriber. It then employs the so-obtained response to decrypt the originator's encrypted message, determines the intended recipient, and retrieves from the repository the coding key assigned to such recipient. The server then issues a new challenge and repeats the above processing and encryption steps using the recipient's subscriber's coding key, thereby re-encoding the message and sending the thus re-encrypted message and the unencrypted new challenge to the receiving station where the same process is employed on the recipient subscriber card to obtain, from the unencrypted new challenge and the recipient subscriber code key stored on the recipient subscriber card, the receiving subscriber response to be used in decryption of the received, server re-encrypted message.
REFERENCES:
patent: 5202921 (1993-04-01), Herzberg et al.
patent: 5371794 (1994-12-01), Diffie et al.
AT&T Corp.
Cain David C.
LandOfFree
Secure data transmission method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Secure data transmission method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Secure data transmission method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1367059