Guideline for ECC Issuer Self-signed Public Key Certificates

EMV SWG NK89r8 EMV® General Bulletin No. 55 First Edition August 2022 _____________________________________________________ Guideline for ECC Issuer Self-signed Public Key Certificates _____________________________________________________ This General Bulletin defines a recommended format for ECC Issuer self-signed public key certificates. Payment systems may decide individually whether to adopt the recommendation in this General Bulletin when processing Issuer certificate requests in the context of:

• EMV Integrated Circuit Card Specifications for Payment Systems, Book 2 – Security and Key Management, Version 4.3, November 2011 as updated by Specification Bulletin 243. countries. EMV SWG NK89r8 Field Name Certificate Format Certificate Encoding Issuer Identifier Length (bytes) 1 1 5 Issuer Public 1 Key Algorithm Suite Indicator Certificate 4 Expiration Date RID Certification Authority Public Key Index Payment System Proprietary Identifier Tracking Number Issuer Public Key 5 1 4 4 NFIELD Issuer Public NSIG Key Certificate Signature

Description

Hex '28' Format b Hex '00' b Leftmost three to ten digits from the Primary Account Number (PAN), padded on the right with hex 'F's. Indicates the algorithms to be used with the Issuer Public Key that is used to verify ICC Public Key Certificates and this Issuer SelfSigned Public Key Certificate. Year, month, day (YYYYMMDD) after which this certificate is invalid. This field is also used to define the requested expiration date of the Issuer Public Key Certificate generated by the Payment System Certification Authority. Identifies the Payment System which is requested to sign the Issuer Public Key. When combined with the RID, uniquely identifies the Payment System key to be used to sign the Issuer Public Key and the associated algorithm suite. Proprietary Identifier whose usage is determined by the Payment System and whose value is assigned by Payment System or Issuer (e.g. for identifying a service). Proprietary Tracking Number whose value is assigned by Payment System or Issuer. Representation of Issuer Public Key (xcoordinate of Issuer public key point) on the curve identified by the Issuer Public Key Algorithm Suite Indicator. Output of digital signature ECC algorithm on concatenated first ten data objects using the Issuer private key on the elliptic curve identified by the Issuer Public Key Algorithm Suite Indicator. cn 10 b n 8 b b b n 8 b b

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