Triple DES, the new data-encryption standard for automated teller machines and point of sale terminals, is proving a bigger implementation challenge than many banks had expected.

Large independent sales organizations have lagged far behind banks, credit unions, and even smaller ISOs in complying with the industry’s Triple DES encryption standard for automated teller machines.

Visa Inc. has “relaxed enforcement” of the July 1, 2010, deadline for petroleum retailers to install software that meets the so-called Triple Data Encryption Standard (also called 3DES or TDES) in ...