Unitary, self-contained card verification and validation system and method

A unitary, self-contained card capable of producing self-validating verification information to verify authorized use of said card comprising:

• keyboard means disposed on said card for entering a personal identification number into said card;
• electronic memory means disposed in said card for storing a predetermined personal identification number associated with said card and for storing a predetermined algorithm;
• electronic logic means for comparing said personal identification number entered through said keyboard means with said predetermined personal identification number stored in said electronic memory means to generate a PIN validation signal upon favorable comparison of said personal identification number entered through said keyboard means and said predetermined personal identification number stored in said electronic memory means;
• means for generating a transaction key number in response to said PIN validation signal, said transaction key number having a value which is different each time said transaction key number is generated;
• means for generating a transaction identification code from said predetermined algorithm and said transaction key number;
• means for indicating on said card said transaction identification code so that the validity of said use of said card can be verified by knowing said predetermined algorithm and by identifying said transaction key number in said transaction identification code so that said transaction key number can be used in said predetermined algorithm to determine the validity of said transaction identification code.

A unitary, self-contained card capable of producing a transaction identification code to verify authorized use of said card comprising:

• keyboard means disposed on said card for entering a personal identification number into said card;
• electronic memory means disposed in said card for storing a predetermined personal identification number associated with said card and for storing a predetermined algorithm;
• electronic logic means for comparing said personal identification number entered through said keyboard means with said predetermined personal identification number stored in said electronic memory means to generate a PIN validation signal upon favorable comparison of said personal identification number entered through said keyboard means and said predetermined personal identification number stored in said electronic memory means;
• means for generating a transaction key number in response to said PIN validation signal, said transaction key number having a value which is different each time said transaction key number is generated;
• means for generating a transaction identification code from said predetermined algorithm and said transaction key number;
• means for indicating on said card said transaction identification code so that the validity of said use of said card can be verified by knowing said predetermined algorithm.