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The SET protocol introduced dual signatures, a new concept in digital signatures. Dual signatures allow two pieces of data to be linked and sent to two different entities for processing. For example, within SET a cardholder is required to send an order information (OI) message to the merchant for processing; at the same time, a payment instructions (PI) message is required by the payment gateway. Figure 8-7 illustrates the dual signature generation process. The dual signature process follows these steps: 1. A message digest is generated for both the OI and the PI. 2. The two message digests are concatenated (hashed) to produce a new block of data. 3. The new block of data is hashed again to provide a final message digest. 4. The final message digest is encrypted using the signer s private key, producing a digital signature. A recipient of either message can check its authenticity by generating the message digest on its copy of the message, concatenating it with the message digest of the other message (as provided by the sender) and computing the message digest of the result. If the newly generated digest
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Figure 8-7
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matches the decrypted dual signature, the recipient can trust the authenticity of the message.
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The SET protocol provides authentication services for participants through the use of X.509v3, and has revocation provisions through the use of CRLv2 (both X.509v3 and CRLv2 are described in 6.). These certificates are application-specific; that is, SET has defined its own specific private extensions that are meaningful only to SET-compliant systems. SET contains the following predefined profiles for each type of certificate:
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Cardholder certificates function as electronic representations of payment cards. Because a financial institution digitally signs these certificates, they cannot be altered by a third party and can be generated only by the financial institution. A cardholder certificate does not contain the account number and expiration date. Instead, the account information and a secret value known only to the cardholder s software are encoded using a one-way hashing algorithm. Merchant certificates function as electronic substitutes for the payment card brand decal that appears in a store window; the decal
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Application-Layer Security Protocols
itself is a representation that the merchant has a relationship with a financial institution allowing it to accept the payment card brand. Because the merchant s financial institution digitally signs them, merchant certificates cannot be altered by a third party and can be generated only by a financial institution.
Payment gateway certificates are obtained by acquirers or their processors for the systems that process authorization and capture messages. The gateway s encryption key, which the cardholder gets from this certificate, is used to protect the cardholder s account information. Payment gateway certificates are issued to the acquirer by the payment card brand organization. Acquirer certificates are required only in order to operate a certification authority that can accept and process certificate requests directly from merchants over public and private networks. Those acquirers that choose to have the payment card brand organization process certificate requests on their behalf do not require certificates because they are not processing SET messages. Acquirers receive their certificates from the payment card brand organization. Issuer certificates are required only in order to operate a certification authority that can accept and process certificate requests directly from cardholders over public and private networks. Those issuers that choose to have the payment card brand organization process certificate requests on their behalf do not require certificates because they are not processing SET messages. Issuers receive their certificates from the payment card brand organization.
Certificate Management
The SET specification states that certificates must be managed through a strict certificate hierarchy, as shown in Figure 8-8 (certificate hierarchies are explained in 6). In the case of SET, each certificate is linked to the signature certificate of the entity that digitally signed it. By following the trust tree to a known trusted party, a person can be assured that the certificate is valid. For example, a cardholder certificate is linked to the certificate of the issuer (or the brand organization on behalf of the issuer). The issuer s certificate is linked back to a root key through the brand organization s certificate. The public signature key of the root is known to all SET software and can be used to verify each of the certificates in turn.
Figure 8-8
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