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A teleprinter (teletypewriter, teletype or TTY) is an electromechanical device that can send and receive typed messages through various communications channels. Learn about the invention, evolution and use of teleprinters in telegraphy, computer communications and aviation industry.
A transponder is a device that responds to a received signal by emitting a different signal. Transponders are used in telecommunications, aviation, marine, sonar, and other fields.
RFID stands for radio-frequency identification, a technology that uses electromagnetic fields to automatically identify and track tags attached to objects. Learn about the history, design, applications, and challenges of RFID from this Wikipedia article.
The T52 was a German cipher machine and teleprinter used by Luftwaffe and Navy units in World War II. It was cryptanalyzed by the Swedes, British and Americans, but was more complex and secure than the Enigma or Lorenz machines.
Newer models were versions T-52c, T-52d and T-52e were in use. The one-time tape cipher teleprinter designated the SFM T-43 was developed in 1943 and introduced in 1944. The machine was theoretically unbreakable, if the key tape was truly random. However, the key tape was pseudo random as it was generated by the T-52e, and therefore insecure.
A transponder code is a four-digit code used by aircraft to identify themselves to air traffic control. The code 0021 was used by Germany for VFR traffic below 5,000 feet until 2007.
An immobiliser prevents the engine from being started unless the correct key is present, reducing motor vehicle theft. Learn about the history, description, regulation, availability, cracking and effectiveness of immobilisers.
Telex is a telecommunication service that provides text-based message exchange over the public switched telephone network or by private lines. It uses teleprinter devices and binary signals, and was a major method of sending text messages electronically between businesses in the post–World War II period.
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