In these situations, a simple decoder like [Rostislav]’s is completely sufficient. We wrote about a couple of Morse code algorithms back in 2014, the MorseDetector and the Magic Morse algorithm .

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“On average, our attack implementation recovers the cryptographic key in approximately 1 minute computation, requiring a few eavesdropped rolling codes (between 4 and 8),” the researchers wrote.

Levente Csikor, a researcher at I2R, A*STAR, explained that RKE systems use a rolling code. The key fob and the car have a counter that increases each time a button is pressed.

Some ciphers have simple keys, others, complex ones. The key for a cipher used by Augustus Caesar, some 2,000 years ago, was simple enough: The receiver just had to shift the alphabet one position.