sentences:  CDMF
  
  In cryptography, CDMF (Commercial Data Masking Facility) is an algorithm developed at IBM in 1992 to reduce the security strength of the 56-bit DES cipher to that of 40-bit encryption, at the time a requirement of U.S. restrictions on export of cryptography.Rather than a separate cipher from DES, CDMF constitutes a key generation algorithm, called "key shortening".