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The poem code is a simple, and insecure, cryptographic method. See also: Topics in cryptography The security of all practical encryption schemes remains unproven, both for symmetric and asymmetric schemes. ...
The method works by the sender and receiver pre-arranging a poem to use. The sender chooses a set number of words at random from the poem and gives each letter in the chosen words a number. The numbers are then used as a key for some cipher to conceal the plaintext of the message. The cipher used was often double transposition. To indicate to the receiver which words had been chosen an indicator group is sometimes sent at the start of the message. Poetry (ancient Greek: poieo = create) is an art form in which human language is used for its aesthetic qualities in addition to, or instead of, its notional and semantic content. ...
A key is a piece of information that controls the operation of a cryptography algorithm. ...
This article is about algorithms for encryption and decryption. ...
In cryptography, plaintext is information used as input to an encryption algorithm; the output is termed ciphertext. ...
In classical cryptography, a transposition cipher changes one character from the plaintext to another (to decrypt the reverse is done). ...
The method is insecure for, if one message is broken by any means (including threat, torture, or even cryptanalysis), future messages will be readable if the source poem has been identified. Since the poems used must be memorable, there is a temptation to use well known poems or poems from well known poets, eg Racine, Moliere, Keats, etc. For the Game Boy Advance cheat device, see CodeBreaker (Game Boy) Cryptanalysis (from the Greek kryptós, hidden, and analýein, to loosen or to untie) is the study of methods for obtaining the meaning of encrypted information without access to the secret information which is normally required to do so. ...
When Leo Marks was appointed codes officer of the Special Operations Executive (SOE) in London during World War II, he very quickly recognized the weakness of the technique, and the consequent damage to agents and to their organizations on the Continent, and began to press for changes. Eventually, the SOE began using original compositions (thus not in any published collection of poems from any poet, though perhaps without so much literary merit) to give added protection, but also adopted other more secure methods such as the one-time pad. Leo Marks at the opening of the Violette Szabo Museum, Wormelow Leopold Samuel Marks (September 24, 1920 - January 15, 2001) was an English cryptographer and scriptwriter. ...
The Special Operations Executive (SOE), often called the Baker Street Irregulars after Sherlock Holmess fictional group of spies, was a World War II organisation initiated by Winston Churchill and Hugh Dalton in July 1940 as a mechanism for conducting warfare by means other than direct military engagement. ...
Mushroom cloud from the nuclear explosion over Nagasaki rising 18 km (over 11 miles) into the air, August 9, 1945 after the Allied atomic bombings of Hiroshima and Nagasaki. ...
In cryptography, the one-time pad (OTP) is the only theoretically unbreakable method of encryption: the plaintext is combined with a random pad the same length as the plaintext. ...
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