Cipher communication system for transaction data

Details Cipher communication system for transaction data Cipher communication system for transaction data

1992-02-06

1995-01-10

Cangialosi, Salvatore

Cryptography

Key management

Having particular key generator

380 23, H04L 906

Patent

active

053814789

ABSTRACT:
A cipher communication system for communicating transaction data between a host computer and a portable electronic device, wherein the host computer includes a first memory for storing a master key data, a generator for generating a transaction key data which is used for enciphering the transaction data, a data converter for enciphering the transaction key data according to the transaction key data and a first interface for transferring the transaction key data enciphered by the data converter, and wherein the portable electronic device includes a second interface for receiving the enciphered transaction key data transferred from the host computer, a second memory for storing the master key data, a second data converter for deciphering the enciphered transaction key data received by the second interface and a third memory for storing the transaction key data deciphered by the second data converter, in the manner causing the stored transaction key to be eliminated at a completion of the communication.

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