The , code named '''ADONIS''', was a Rotor Machine Encryption system introduced in the 1950s by the U.S. National Security Agency . It had eight rotors, seven of which moved in a complex pattern. The non-moving rotor was in the middle of the stack. It replaced the SIGABA system developed during World War II .
The KL-7 was designed for off-line operation. It was about the size of a Teletype machine and had a similar three-row keyboard, with shift keys for letters and figures. The KL-7 produced printed output on narrow paper strips that were then glued to message pads. When encrypting, it automatically placed a space between each five-letter code group. There was an adaptor available, the , that allowed 5-level Baudot punched Paper Tape from Teletype equipment to be read for decryption. The standard KL-7 had no ability to punch tapes. A variant of the KL-7, the '''KL-47''', could also punch paper tape, allowing direct input to teleprinters.
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