WordNet (r) 3.0 (2006):

DEA
    n 1: federal agency responsible for enforcing laws and
         regulations governing narcotics and controlled substances;
         goal is to immobilize drug trafficking organizations [syn:
         Drug Enforcement Administration, Drug Enforcement
         Agency, DEA]

The Free On-line Dictionary of Computing (19 January 2023):

Data Encryption Algorithm
DEA

   (DEA) An ANSI standard defined in ANSI X3.92-1981.  It is
   identical to the Data Encryption Standard (DES).

   (1994-12-06)