emvlab.org
Updates in June 2017: For more details on updates to EMVLab, including HTTPS and better handling of 3-byte and unknown tags see my blog post.
Name Description Source Format Template Tag Length P/C
Authorisation Response Cryptogram (ARPC) Cryptogram generated by the issuer and used by the card to verify that the response came from the issuer. Issuer b 4 or 8

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