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Resources

ASCII
http://en.wikipedia.org/wiki/ASCII

Morse Code
http://en.wikipedia.org/wiki/Morse_code

International maritime signal flags
http://en.wikipedia.org/wiki/International_maritime_signal_flags

Braille
http://en.wikipedia.org/wiki/Braille

Amino acids
http://en.wikipedia.org/wiki/Amino_acid

Semaphore
http://en.wikipedia.org/wiki/Flag_semaphore

Tap code
http://en.wikipedia.org/wiki/Tap_code

Cipher tools
http://rumkin.com/tools/cipher