IBM Computer Hardware 2 User Manual Page 475
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CCA Release 2.54
The following is an example of calculating the current PIN encrypting key:
W
a
= X'4567 89AB CDE '
C
a
= X'11'
S
a
1
= X'1'
T
a
1
= X'4567 89AB CDF '
T
b
1
= X'6489 F5A3 1618 2AB'
T
c
1
= X'F9AC C638 1939 44BC'
K
a
2
= X'D842 BA3 C2D1 6417'
.
.
.
S
a
20
= X'1'
T
a
20
= X'4567 89AB CDF 1'
T
b
20
= X'9D25 339B F21 6416'
T
c
20
= X'BF49 836E AE2A 42A'
K
a
20
= X'67B 395E 6CFB 63D'
Current PIN encrypting key = X'67B 395E 6CFB 6C2'
Performing the Special Encryption and Special Decryption Processes
The special encryption process consists of the following steps:
1. Name the derived unique key for the current transaction K
u
.
2. Name the clear PIN-block that was built from the user-entered PIN P
c
.
3. Perform an XOR operation with the rightmost byte of K
u
and X'FF' to produce
a variant of the key; name the result K
u
v
.
4. Perform an XOR operation with K
u
v
and P
c
; store the result in T
1
.
5. Encrypt T
1
with K
u
v
; store the result in T
2
.
6. Perform an XOR operation with K
u
v
; store the result in P
e
.
The value in P
e
is the encrypted PIN-block that the POS terminal will send.
The special decryption process consists of these steps, in reverse.
The following is an example of the special encryption process:
Current encrypting key = K
u
= X'67B 395E 6CFB 63D'
User-entered PIN = 1234
User’s primary account-number = X'412 3456 789'
Clear PIN-block (unformatted) = X'412 34FF FFFF FFFF'
Primary account-number (formatted) = X' 412 3456 789'
Clear PIN-block (ANSI format) = P
c
= X'412 74ED CBA9 876F'
Variant of PIN encrypting key = K
u
v
= X'67B 395E 6CFB 6C2'
T
1
= X'6319 4DB3 A752 E7AD'
T
2
= X'5145 3CA3 E474 2148'
P
e
= X'364E 5FD 888F 418A'
Appendix E. Financial System Verbs Calculation Methods and Data Formats E-15
- Release 2.54 1
- IBM iSeries PCICC Feature 1
- Contents 3
- CCA Release 2.54 10
- Trademarks 13
- About This Publication 15
- Release 2.52 16
- Release 2.51 16
- Release 2.41 17
- About This Publication xix 19
- Organization 22
- Related Publications 23
- Cryptography Publications 23
- Overlapped Processing 31
- CCA Access-Control 40
- Understanding Access Control 40
- Role-Based Access Control 40
- Understanding Roles 41
- Understanding Profiles 42
- Logging On and Logging Off 45
- Multi-Coprocessor Capability 48
- Establishing Master Keys 51
- Logon_Control (CSUALCT) 90
- Master_Key_Process (CSNBMKP) 97
- Related Information 100
- Random_Number_Tests (CSUARNT) 102
- Restrictions 102
- Parameters 102
- Required Commands 103
- Chapter 3. RSA Key-Management 105
- Key Generation 106
- Key Import 108
- Using the PKA Keys 109
- Extracting a Public Key 110
- PKA_Key_Generate (CSNDPKG) 111
- PKA_Key_Import (CSNDPKI) 115
- PKA_Key_Token_Build (CSNDPKB) 118
- CCA Release 2.54 122
- Digital Signatures 136
- MDC_Generate (CSNBMDG) 144
- One_Way_Hash (CSNBOWH) 147
- Chapter 5. DES Key-Management 151
- Control Vectors 154
- Key Types 155
- Key-Usage Restrictions 156
- Key Tokens 162
- Key Labels 164
- Key Identifiers 164
- Installing and Verifying Keys 165
- Generating Keys 166
- Diversifying Keys 169
- Storing Keys in Key Storage 170
- Security Precautions 171
- Clear_Key_Import (CSNBCKI) 172
- Data_Key_Export (CSNBDKX) 181
- Data_Key_Import (CSNBDKM) 183
- Key_Export (CSNBKEX) 192
- Key_Generate (CSNBKGN) 194
- Key-Length Specification 199
- Key_Import (CSNBKIM) 201
- CCA Release 2.54 Key_Import 203
- Key_Part_Import (CSNBKPI) 204
- Key_Test (CSNBKYT) 208
- Key_Token_Build (CSNBKTB) 211
- Key_Token_Change (CSNBKTC) 214
- Key_Token_Parse (CSNBKTP) 216
- Key_Translate (CSNBKTR) 219
- PKA_Decrypt (CSNDPKD) 223
- PKA_Encrypt (CSNDPKE) 225
- PKA_Encrypt CCA Release 2.54 226
- Ensuring Data Confidentiality 243
- Ensuring Data Integrity 245
- Decipher (CSNBDEC) 247
- Decipher CCA Release 2.54 248
- Encipher (CSNBENC) 250
- CCA Release 2.54 Encipher 251
- MAC_Generate (CSNBMGN) 253
- MAC_Verify (CSNBMVR) 256
- Chapter 7. Key-Storage Verbs 259
- Key-Label Content 260
- DES_Key_Record_List (CSNBKRL) 265
- PKA_Key_Record_List (CSNDKRL) 273
- PKA_Key_Record_Read (CSNDKRR) 275
- Retained_Key_List (CSNDRKL) 280
- Processing Financial PINs 284
- PIN-Verb Summary 287
- Providing Security for PINs 288
- PIN Security 289
- PIN-Calculation Methods 290
- Data_Array 290
- PIN Profile 292
- PIN-Extraction Methods 294
- Working With EMV Smart Cards 295
- Clear_PIN_Encrypt (CSNBCPE) 297
- Clear_PIN_Generate (CSNBPGN) 300
- CVV_Generate (CSNBCSG) 309
- CVV_Verify (CSNBCSV) 312
- PIN_Change/Unblock (CSNBPCU) 334
- SET_Block_Compose (CSNDSBC) 348
- SET_Block_Decompose (CSNDSBD) 352
- Return Codes 361
- Reason Codes 361
- Return Code 0 362
- Return Code 4 363
- Return Code 8 364
- Return Code 12 370
- Return Code 16 371
- Appendix B. Data Structures 373
- Null Key-Token 374
- DES Key-Tokens 375
- External DES Key-Token 377
- RSA PKA Key-Tokens 378
- RSA Key-Token Sections 379
- PKA Key-Token Integrity 380
- Chaining-Vector Records 392
- Key-Storage Records 393
- Key_Record_List Data Set 397
- Role Structure 401
- Aggregate Role Structure 402
- Access-Control-Point List 402
- Default Role Contents 403
- Profile Structure 404
- Aggregate Profile Structure 405
- Authentication Data Structure 405
- User Profile 408
- Role Data Structure 411
- Aggregate Role Data Structure 412
- Function Control Vector 414
- Encryption 417
- Changing Control Vectors 432
- Mask Array Preparation 436
- Notation Used in Calculations 444
- MDC-1 Calculation 444
- MDC-2 Calculation 445
- MDC-4 Calculation 445
- Ciphering Methods 445
- ANSI X9.23 447
- MAC Calculation Methods 453
- RSA Key-Pair Generation 455
- Access-Control Algorithms 456
- ANSI X9.31 Hash Format 459
- PKCS #1 Formats 459
- PIN-Calculation Methods 462
- PIN-Block Formats 469
- 3624 PIN-Block Format 469
- ISO-0 PIN-Block Format 470
- ISO-1 PIN-Block Format 471
- ISO-2 PIN-Block Format 472
- UKPT Calculation Methods 473
- CVV and CVC Method 476
- PIN-Block Self-encryption 479
- Appendix F. Verb List 481
- List of Abbreviations 491
- Glossary 493
- Numerics 499
- PDF File 508
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