IBM Computer Hardware 2 User Manual download pdf (Page 284)

CCA Release 2.54

Figure 8-1 (Page 2 of 2). Financial Services Support Verbs

Verb Page Service Entry

Point

Svc

Lcn

PIN_Change/Unblock 8-52 Calculates a PIN for a smart card based on keys and data

you supply according to VISA and EMV specifications.

CSNBPCU E

Secure_Messaging_for_Keys 8-59 Securely incorporates a key into a text block which is then

encrypted (generally for use with EMV smart cards).

CSNBSKY E

Secure_Messaging_for_PINs 8-62 Securely incorporates a PIN block into a text block which

is then encrypted (generally for use with EMV smart

cards).

CSNBSPN E

SET_Block_Compose 8-66 Creates a SET-protocol RSA-OAEP block and DES

encrypts the data block in support of the SET protocols.

CSNDSBC E

SET_Block_Decompose 8-70 Decomposes the RSA-OAEP block and DES decrypts the

data block in support of the SET protocols.

CSNDSBD E

Transaction_Validation 8-75 Generates and verifies American Express Card Security

Codes (CSC).

CSNBTRV E

Service location (Svc Lcn): E=Cryptographic Engine, S=Security API software

Processing Financial PINs

This section describes how the financial personal identification number (PIN) verbs

allow you to process financial PINs. A financial PIN is used to authorize personal

financial transactions for a customer who uses an automated teller machine or

point-of-sale device.

A financial PIN is similar to a password except that a financial

PIN consists of decimal digits and is normally a cryptographic function of an

associated account number. The financial PIN verbs support PINs that range from

4 to 16 digits in length. (A financial PIN is usually 4 digits in length.)

The financial PIN verbs form a complete set of verbs that you can use in various

combinations to process financial PINs. The verb relationships and primary inputs

and outputs are depicted in Figure 8-2 on page 8-4, You use these verbs to do the

following:

 Provide security for the PINs by supporting encrypted PIN-blocks with these

capabilities:

– Encryption of a clear PIN in various PIN-block formats

– Generation of random PIN values and encryption of these in various

PIN-block formats

– Verification of a PIN. The PIN block is decrypted as part of the verification

service

– Reencrypting a PIN-block under another key with optional, integral

changing of the PIN-block format.

 Support multiple PIN-calculation methods

 Support multiple PIN-block formats and PIN-extraction methods

 Support ANSI X9.24 derived unique-key-per-transaction PIN-block encryption

 Provide the following services:

In this chapter, automated teller machine (ATM) can also mean a point-of-sale device, an enhanced teller terminal, or a

programmable workstation, unless noted otherwise.

8-2 IBM 4758 CCA Basic Services, Release 2.54, February 2005

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