Method and apparatus for improving performance and security of DES-CBC encryption algorithm

摘要

Method and apparatus for transforming data in a data processing system. A first portion of a block of data is transformed using a first key having a first number of bits, and a second portion of the block of data is transformed using a second key having a second number of bits different than the first number of bits. One of the first and second keys provides an increase in transformation speed while the other of the first and second keys provides an enhanced degree of data security.