Visa Inc.
Method, System, and Computer Program Product for Network Bound Proxy Re-Encryption and PIN Translation

Abstract:

A method, system, and computer program product generate, with a payment network, a first value (a) and a second value (g.sup.a), the second value (g.sup.a) generated based on the first value (a) and a generator value (g); generate, with the payment network, a plurality of random merchant numbers (m.sub.i) for a respective plurality of merchant banks; determine, with the payment network, a merchant product (M) based on a product of the plurality of random merchant numbers (m.sub.i); generate, with the payment network, a public key (pk.sub.i) based on the second value (g.sup.a), the merchant product (M), and the random merchant number (m.sub.i) and a random key (rk.sub.i) based on the merchant product (M) and the random merchant number (m.sub.i) for each respective merchant bank; and communicate, with the payment network, the public key (pk.sub.i) and the random key (rk.sub.i) to at least one respective merchant bank.