KL-7TSEC-ADONIS-Encryption Machine

The TSEC/KL-7, codenamed ADONIS, was a rotor-based cipher machine developed by the U.S. National Security Agency in 1952 to replace the SIGABA. Designed for secure, offline encryption, it featured eight rotors—seven moving in a complex, irregular pattern—and employed a re-entry mechanism that reintroduced encrypted output back into the system for additional scrambling. The KL-7 printed ciphertext on narrow paper strips in five-letter groups, facilitating Morse code transmission. Widely used by U.S. military and NATO forces for Secret-level communications, it remained in service until 1983, when it was succeeded by digital systems like the KL-51

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