Jeremiah Denton blinked T-O-R-T-U-R-E in morse code while filming propaganda as a prisoner of war - May 17, 1966.
/r/codes: Codes & ciphers - Hiding data, cracking codes, finding hidden messages. We welcome posts that aren't as suitable for /r/crypto, such as basic cipher-cracking challenges and discussions of simple data hiding. - July 15, 2018 - 02:01