Transaction Variant Encryption Keys in EFTPOS
Original Publication Date: 1989-Jun-01
Included in the Prior Art Database: 2005-Jan-28
In Electronic Funds Transfer Point of Sale Systems (EFTPOS) it is required that Personal Identification Number (PIN) values should be entered on a PIN pad and encrypted with maximum security. In the system disclosed the encryption key values change after each transaction in a synchronized manner between partner or standby Hardware Security Module (HSM). When it is necessary to communicate transaction variant key values to an alternative (HSM), a new sequence of key values is started common to both HSMs. The key values are generated as sequences by predetermined functions from a seed value derived from a master seed value.