Package `szyfrow`

Simple ciphers, enciphering, deciphering, and breaking.

The ciphers implemented here are mostly ones that predate mechanical cipher +systems. The most complex cipher is the Enigma of World War II.

Each cipher is presented with functions to encipher, decipher, and +automatically break messages with that cipher.

Most of the time, messages are broken by brute-force trying each possible key +and scoring the resulting deciphered message using a bag-of-words probability +measure (or a bag-of-bigrams, or a bag-of-trigrams).

You can find more information on the ciphers and how they are implemented in +the codes and ciphers area of my blog.

Ciphers work on messages encoded with the 26 letters of the Latin alphabet, +without accents (the letters contained in the string.ascii_letters constant). +Most of the ciphers convert letters to lowercase, strip accents from letters, +and drop all other characters (such as spaces and punctuation).

szyfrow.support.text_prettify contains functions to make the output easier +to read, such as automatically recovering word boundaries.

The name comes from the Polish cipher bureau, the Biuro SzyfrÃ³w, who were +breaking Enigma ciphers by hand before World War II.

+Expand source code +

"""Simple ciphers, enciphering, deciphering, and breaking.
+
+The ciphers implemented here are mostly ones that predate mechanical cipher
+systems. The most complex cipher is the Enigma of World War II.
+
+Each cipher is presented with functions to encipher, decipher, and 
+automatically break messages with that cipher.
+
+Most of the time, messages are broken by brute-force trying each possible key
+and scoring the resulting deciphered message using a bag-of-words probability
+measure (or a bag-of-bigrams, or a bag-of-trigrams).
+
+You can find more information on the ciphers and how they are implemented in
+the [codes and ciphers area of my blog](https://work.njae.me.uk/tag/codes-and-ciphers/).
+
+Ciphers work on messages encoded with the 26 letters of the Latin alphabet,
+without accents (the letters contained in the `string.ascii_letters` constant).
+Most of the ciphers convert letters to lowercase, strip accents from letters,
+and drop all other characters (such as spaces and punctuation).
+
+`szyfrow.support.text_prettify` contains functions to make the output easier
+to read, such as automatically recovering word boundaries.
+
+The name comes from the Polish cipher bureau, the Biuro SzyfrÃ³w, who were 
+breaking Enigma ciphers by hand before World War II.
+"""

Sub-modules

szyfrow.affine: +
Enciphering and deciphering using the affine cipher. +Also attempts to break messages that use an â¦
+
szyfrow.amsco: +
Enciphering and deciphering using the Amsco cipher. +Also attempts to break messages that use â¦
+
szyfrow.autokey: +
Enciphering and deciphering using the Autokey cipher. +Also attempts to break messages that use a â¦
+
szyfrow.bifid: +
Enciphering and deciphering using the Bifid cipher. +Also attempts to break messages that use a Bifid â¦
+
szyfrow.bombe: +
A simulator for Bombe machines â¦
+
szyfrow.cadenus: +
Enciphering and deciphering using the Cadenus cipher. +Also attempts to break messages that use a â¦
+
szyfrow.caesar: +
Enciphering and deciphering using the Caesar cipher. +Also attempts to break messages that use a Caesar â¦
+
szyfrow.column_transposition: +
Enciphering and deciphering using the Column transposition cipher. +Also attempts to break messages that â¦
+
szyfrow.enigma: +
A simulator for Enigma machines â¦
+
szyfrow.keyword_cipher: +
Monoalphabetic substitution ciphers, mainly done by keyword. Enciphering +and deciphering, and a couple of ways to break these ciphers.
+
szyfrow.language_model_files: +
Descriptions of English, used for building language models â¦
+
szyfrow.playfair: +
Enciphering and deciphering using the Playfair cipher. +Also attempts to break messages that use a â¦
+
szyfrow.pocket_enigma: +
The Pocket Enigma machine, a simple example that illustrates the mechanisms +of the Enigma machine. See [a â¦
+
szyfrow.polybius: +
Simple digraph substitution cipher, using the +Polybius square. Enciphering +and deciphering, and a â¦
+
szyfrow.railfence: +
Railfence transposition cipher â¦
+
szyfrow.support: +
Support utilities for ciphers â¦
+
szyfrow.vigenere: +
VigenÃ¨re polyalphabetic substitution ciphers, +mainly done by keyword. Also does Beaufort â¦
+