Source : Free On-Line Dictionary of Computing

International Data Encryption Algorithm
     
         (IDEA) A conventional {encryption}
        {algorithm}, written by Xuejia Lai and James Massey, in 1992.
     
        It is a {block cipher}, considered to be the best and most
        secure available, and operates on 64-bit blocks with a 128 bit
        {key}.
     
        It is used by {Pretty Good Privacy}.
     
        (1996-03-07)