Payment Technologies for E-Commerce by Weidong Kou

By Weidong Kou

Electronic cost is the industrial spine of all e-commerce transactions. This booklet covers the most important matters relating to e-payment equivalent to, for instance, public key infrastructure, clever playing cards, cost brokers, electronic funds, SET protocols, and micro-payment. Its first half covers the infrastructure for safe e-payment over the net, while within the moment half various e-payment equipment and structures are described.

This edited quantity bargains a well-written and sound technical evaluation of the cutting-edge in e-payment for e-business builders, graduate scholars, and specialists. it's also ideal for sessions and coaching classes in e-commerce or e-payment.

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We call this the CRL time-granularity problem. Another concern is the size of the CRL. A CA can be expected to certify thousands, or even hundreds of thousands, of subjects. While the rate of revocations for a given population is generally unpredictable, the CRLs for such CAs can be expected to grow very large. When a CRL is too large it can be difficult to retrieve by users, whose access to the CA may have limited bandwidth. Also, since CRLs are signed, their signatures need to be verified before the CRL can be used, and the time required to verify the signature on a large CRL and process its entries can become significant.

Compute kP = (Xl. YI) and r = XI mod n. To avoid a security condition, XI should not equal 0. 3. Compute k· 1 mod n. 4. Compute s = k· 1 (h(m) + dr) mod n. h is the SHA-I. 5. If s = 0, then go to Step 1. If s = 0, then S·I mod n does not exist and S·l is required in the signature verification process. 6. The signature for the message m is the pair of integers (r, s). ECDSA 1. 2. 3. 4. 5. 6. signature verification: Entity B obtains an authentic copy of entity A's public key (E, P, n, Q). Verify that rand s are integers in the interval [I, n - I].

4 Challenge-Response Identification (Strong Authentication) Challenge-response identification is also an important kind of authentication. The idea of cryptographic challenge-response protocols is that one entity (the claimant, or prover) "proves" its identity to another entity (the verifier) by demonstrating knowledge of a secret known to be associated with that entity, without revealing the secret itself to the verifier during the protocol. This is accomplished by answering a time-variant challenge, where the answer is determined by both the prover's secret and the challenge.

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