3DS ReferenceProtocol & field guide

EMV 3-D Secure · Core specification 2.3.1.1

ACS Ephemeral Public Key (QT)acsEphemPubKey

Public key component of the ephemeral key pair generated by the ACS and used to establish session keys between the 3DS SDK and the ACS. See Section 6.2.3.2 for additional detail.

Explore this field with transaction context

This is a contained member of acsSignedContent, not a separate top-level message field. Read the parent’s requirements.

Message inclusion

Baseline inclusion. Effective requirements depend on transaction context. Check the field’s conditions and FAQ qualifications; select channel and category in the explorer.

MessageBaseline inclusion
AResConditional

Conditional inclusion — source text

See ACS Signed Content.

Format and scope

Type: Object · Length: Variable, maximum 256 characters · Maximum length: 256

Source components
ACS
Device channels
01-APP
Message categories
01-PA, 02-NPA

Reference notes

  • Conveyed within the acsSignedContent JWS object rather than as a top-level message field. See Section 6.2.3.2.

Version history

No field introduction version is tagged in the dataset. Introduction tags are curated metadata, not a full history of changes. Compare versions and understand coverage.

Source and review status

EMV_3DS_CoreSpec_v2.3.1.1_20230530.pdf, Table A.1, PDF pages 202

Source review status: carried-forward. Carried-forward material has not acquired a new verification claim.

Source document fingerprint

EMV_3DS_CoreSpec_v2.3.1.1_20230530.pdf

6fdf0aba3fc1a765f96b74dad4069d1e189969f38f0023647021687daf589d6b

Official EMVCo specifications · Methodology and coverage limits