If only Alan Turing was still alive! The story of the dead pigeon via Reuters:
A World War Two code found strapped to the leg of a dead pigeon stuck in a chimney for the last 70 years may never be broken, a British intelligence agency said on Friday.
The bird was found by a man in Surrey, southern England while he was cleaning out a disused fireplace at his home earlier this month.
The message, a series of 27 groups of five letters each, was inside a red canister attached to the pigeon’s leg bone and has stumped code-breakers from Government Communications Headquarters (GCHQ), Britain’s main electronic intelligence-gathering agency.
“Without access to the relevant codebooks and details of any additional encryption used, it will remain impossible to decrypt,” a GCHQ spokesman said…
[continues at Reuters]