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The 1989 International Obfuscated C Code Contest (IOCCC) included an entry by Brian Westley. Westley's computer program can be encoded in ROT13 or reversed and still compiles correctly. Its operation, when executed, is either to perform ROT13 encoding on, or to reverse its input. [5]
In cryptography, a Caesar cipher, also known as Caesar's cipher, the shift cipher, Caesar's code, or Caesar shift, is one of the simplest and most widely known encryption techniques. It is a type of substitution cipher in which each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet .
The Atbash cipher is a particular type of monoalphabetic cipher formed by taking the alphabet (or abjad, syllabary, etc.) and mapping it to its reverse, so that the first letter becomes the last letter, the second letter becomes the second to last letter, and so on.
Hidden messages include backwards audio messages, hidden visual messages and symbolic or cryptic codes such as a crossword or cipher. Although there are many legitimate examples of hidden messages created with techniques such as backmasking and steganography , many so-called hidden messages are merely fanciful imaginings or apophany .
Other examples include the use of Ш for W, Ц for U, Я/Г for R/backwards and upside-down L, Ф for O, Д for A, Б, Ь, or Ъ for B/b, З, Э, or Ё for E, Ч or У for Y. Outside the Russian alphabet, Џ (from Serbian) can act as a substitute for U, Ғ (from Turkic languages) for F, Ә (from Turkic languages, Abkhaz, Dungan, Itelmen, Kalmyk ...
The Abwehr code had been broken on 8 December 1941 by Dilly Knox. Agents sent messages to the Abwehr in a simple code which was then sent on using an Enigma machine. The simple codes were broken and helped break the daily Enigma cipher. This breaking of the code enabled the Double-Cross System to operate. [19]
A numeric character reference refers to a character by its Universal Character Set/Unicode code point, and a character entity reference refers to a character by a predefined name. A numeric character reference uses the format &#nnnn; or &#xhhhh; where nnnn is the code point in decimal form, and hhhh is the code point in hexadecimal form.
Decompilation is the process of transforming executable code into a high-level, human-readable format using a decompiler.This process is commonly used for tasks that involve reverse-engineering the logic behind executable code, such as recovering lost or unavailable source code.