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The Cylink ATM Encryptor product line is a series of 4 models of cryptographic systems for Asynchronous Transfer Mode (ATM) networks. The line includes the Cylink ATM Encryptor2 (T1/E1 data rates), Cylink ATM Encryptor45(T3/E3 data rates), Cylink ATM Encryptor155(OC-3c/STM-1 data rates), and Cylink ATM Encryptor622(OC-12c/STM-4 data rates). Data Encryption is done using 56-bit key DES, 112-bit key Triple DES, and 168-bit key Triple DES in ECB and Counter Mode. The DES encryption is implemented in hardware in multiple Field Programmable Gate Arrays (FPGAs).