Field 53: Security Related Control Information

Format: an16

PIN Encryption control information. This field is mandatory when online PIN data is present, except where DUKPT information is supplied in Field 63, tag 01.

The field is comprised as below:

Position Description Value


Key Type Identifier

01 - TPK

02 - ZPK

03 - Asymmetric Key


Key Identifier

03 to 99

Value to be provided by Elavon


Reserved for future use


Please note the Key Type and Key Identifiers will be supplied by Elavon.