SB nº 311: Updates to EMV Contactless Book C-2

EMV® Specification Bulletin No. 311 First Edition, May 2025 Updates to EMV® Contactless Specifications for Payment Systems Book C-2 – Kernel 2 Specification

Applicability

This Specification Bulletin applies to:

• EMV Contactless Specifications for Payment Systems, Book C-2, Kernel 2 Specification, version 2.11, June 2023

Related Documents

• None

Effective Date

• Immediate

Description

This specification bulletin contains clarifications and corrections to Book C-2, Kernel 2 Specification.

First Edition May 2025 Details of Changes This specification bulletin discusses changes to the following topics: A. Issuer Public Key Remainder B. Data Object Format in TLV Database C. GPO Command Not Sent Key Yellow highlights existing text with areas of addition or change. Blue text indicates final text; that is, text that has been changed or inserted.

First Edition May 2025 A. Issuer Public Key Remainder In section A.1.86 Issuer Public Key Remainder: Change: Tag: Template: Length: Format: Update: '92' '70' or '77' NI

• NCA + 36 b K/RA Description: Remaining digits of the modulus of the Issuer public key. To: Tag: Template: Length: Format: Update: '92' '70' or '77' var. b K/RA Description: The rRemaining NI
• NCA + 36 digits of the modulus of the Issuer public key. First Edition May 2025 B. Data Object Format in TLV Database In section 4.1.1: Change: Data objects in the TLV Database have a name, a tag, a length, and a value; for example: Name: Amount, Authorized (Numeric) Tag: '9F02' Length: 6 Value: '000000002345' To Data objects in the TLV Database have a name, a tag, a length, and a value, and a format; for example: Name: Tag: Length: Value: Format: Amount, Authorized (Numeric) '9F02' 6 '000000002345' n 12 C. GPO Command Not Sent In section 6.3, connector 2 and connector 4 in state S1: Change: S1 2 First Edition May 2025 DE/ No DS Yes 15 Add known data listed in Tags To Read Yet to Data To Send 16 Initialize EMV/DE data objects 16.1 Initialize IDS data objects 17 Reader supports No IDS? Yes 18 Add DS ID and Appl. Cap. Info to Data To Send 3 4 To: 2 DE/ No DS Yes 15 Add known data listed in Tags To Read Yet to Data To Send 16 Initialize EMV/DE data objects 16.1 Initialize IDS data objects 17 Reader supports No IDS? Yes 18 Add DS ID and Appl. Cap. Info to Data To Send 3 First Edition May 2025 s3 – waiting for GPO response 4 Change: First Edition May 2025 To: S1 3 19 Card supports No IDS? Yes 20 Set IDS Read Flag First Edition May 2025 4 21 Missing PDOL Data Flag No set? Yes 22 DEK 23 Start Timer s2 – waiting for PDOL data s3 – waiting for GPO response First Edition May 2025

Legal Notice

Unless the user has an applicable separate agreement with EMVCo or with the applicable payment system, any and all uses of these Specifications is subject to the terms and conditions of the EMVCo Terms of Use agreement available at www.emvco.com and the following supplemental terms and conditions. The license granted in the EMVCo Terms of Use specifically excludes (a) the right to disclose, distribute or publicly display these Specifications or otherwise make these Specifications available to any third party, and (b) the right to make, use, sell, offer for sale, or import any software or hardware that practices, in whole or in part, these Specifications. Further, EMVCo does not grant any right to use the Kernel Specifications to develop contactless payment applications designed for use on a Card (or components of such applications). As used in these supplemental terms and conditions, the term “Card” means a proximity integrated circuit card or other device containing an integrated circuit chip designed to facilitate contactless payment transactions. Additionally, a Card may include a contact interface and/or magnetic stripe used to facilitate payment transactions. To use the Specifications to develop contactless payment applications designed for use on a Card (or components of such applications), please contact the applicable payment system. To use the Specifications to develop or manufacture products, or in any other manner not provided in the EMVCo Terms of Use, please contact EMVCo. These Specifications are provided "AS IS" without warranties of any kind, and EMVCo neither assumes nor accepts any liability for any errors or omissions contained in these Specifications. EMVCO DISCLAIMS ALL REPRESENTATIONS AND WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT, AS TO THESE SPECIFICATIONS. EMVCo makes no representations or warranties with respect to intellectual property rights of any third parties in or in relation to the Specifications. EMVCo undertakes no responsibility to determine whether any implementation of these Specifications may violate, infringe, or otherwise exercise the patent, copyright, trademark, trade secret, know-how, or other intellectual property rights of third parties, and thus any person who implements any part of these Specifications should consult an intellectual property attorney before any such implementation. Without limiting the foregoing, the Specifications may provide for the use of public key encryption and other technology, which may be the subject matter of patents in several countries. Any party seeking to implement these Specifications is solely responsible for determining whether its activities require a license to any such technology, including for patents on public key encryption technology. EMVCo shall not be liable under any theory for any party's infringement of any intellectual property rights in connection with these Specifications. © 2025 EMVCo, LLC. All rights reserved. Reproduction, distribution and other use of this document is permitted only pursuant to the applicable agreement between the user and EMVCo found at www.emvco.com. EMV® is a registered trademark or trademark of EMVCo, LLC in the United States and other countries.