ID-Based Fair Off-Line Electronic Cash System with Multiple Banks

ID-based public key crypto\-graphy (ID-PKC) has many advantages overcertificate-based public key cryptography (CA-PKC), and has drawnresearchers' extensive attention in recent years. However, theexisting electronic cash schemes are constructed under CA-PKC, andthere seems no electronic cash scheme under ID-PKC up to now to thebest of our knowledge. It is important to study how to constructelectronic cash schemes based on ID-PKC from views on both practicalperspective and pure research issue. In this paper, we present asimpler and provably secure ID-based restrictive partially blindsignature (RPBS), and then propose an ID-based fair off-lineelectronic cash (ID-FOLC) scheme with multiple banks based on theproposed ID-based RPBS. The proposed ID-FOLC scheme with multiplebanks is more efficient than existing electronic cash schemes withmultiple banks based on group blind signature.