Firefly (key exchange protocol)

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Firefly is a U.S. National Security Agency public-key key exchange protocol, used in EKMS, the STU-III secure telephone, and several other U.S. cryptographic systems.


  • RFC 2522
  • Communications Security Custodian Guide, USAREUR Pamphlet 380-40
  • TACLANE-Micro Inline Network Encryptor Interface & Operator’s Guide