Financial institutions are performing large scale migrations of their systems from DES to triple-DES. In this white paper, we describe the basic characteristics of DES and triple-DES and look at the security properties that a financial transaction system will want to achieve.

We then look at the problems related with a migration from DES to triple-DES; enumerating and discussing several points that we suggest should be considered. Finally, we give some suggestions that will help ease the problems of migration.