SB nº SU-34 : Format 1 Secure Messaging for Confidentiality (Spec Change)

Specification Update: Bulletin No. 34 First Edition May 2004 Format 1 Secure Messaging for Confidentiality

Applicability

This Specification Update applies to

• EMV 2000 Integrated Circuit Card Specifications for Payment Systems Version 4.0 Book 2, Section 9.3 Secure Messaging for Confidentiality.

Related Documents

None For Format 1 secure messaging for confidentiality, Book 2 describes the format of the data object containing the enciphered command data field when padding is not indicated. This bulletin adds the format to be used when padding is indicated. Please replace the first paragraph and the associated figure in EMV 2000 Integrated Circuit Card Specifications for Payment Systems Version 4.0, Book 2, Section 9.3.1.1 Format 1 with the following: “The format of a data object for confidentiality in the command data field of a secured command is shown in Figure 5. Tag Length Value T L Cryptogram (enciphered data field) Or Padding Indicator Byte || Cryptogram (enciphered data field) Figure 5

• Format 1
• Data Object for Confidentiality ISO/IEC 7816-4 specifies the tags, which may be allocated to the cryptogram resulting from the encipherment of the data field of the unsecured command. An odd tag shall be used if the object is to be integrated in the computation of a MAC; an even tag shall be used otherwise. This document contains proprietary and confidential information of EMVCo LLC. Copyright © EMVCo LLC 2004 If tag '86' or '87' is allocated to the data object for confidentiality, the value field of the data object for confidentiality contains the padding indicator byte followed by the cryptogram. If another tag is used, the value field of the data object for confidentiality contains the cryptogram only.” This document contains proprietary and confidential information of EMVCo LLC. Copyright © EMVCo LLC 2004