Description of the module ClassicCiphers

Name: Saúl Ponce

is699399

Uses Python 3.6

Instance methods:

• ClassicCiphers(alphabet: srt)
  • Constructor, the alphabet is a string with the symbols to use, do not separete them with spaces unless you want the space character to be part of your alphabet.
• caesar(message: str, key: int) -> str
  • Caesar cipher, do decrypt use the key multiplied by -1.
• affine(message: str, key: (int, int)) -> str
  • Affince cipher, the key is a tuple with (a, b), given that the message is encrypted using the formula F(x, [a, b]) = (ax + b) mod m.
• playfair(message: str, key: str) -> str
  • Playfair cipher, uses a word key, the key must be buildable form the alphabet, the result is given without the letter j.
• vigenere(message: str, key: str) -> str
  • Vigenerè cipher, the key must be buildable with the alphabet.
• daffine(message: str, key: (int, int)) -> str
  • Affince decipher.
  • The key is exactly the same used to encrypt, this method computes de modular inverse of a and substracts b.
• dplayfair(message: str, key: str) -> str
  • Playfair decipher, uses a word key.
• dvigenere(message: str, key: str) -> str
  • Vigenerè decipher, uses a word key.
• gen_caesar() -> int
  • Generates numbers to serve as keys to the method.
  • The numbers come from 0 (inclusive) to len(alphabet) (exclusive).
• gen_affine() -> (int, int)
  • Generates tuples to serve as keys to the daffine method.
  • Generets (a, b) tuples given (a, b) are part of the set of nombers between 0 (inclusive) to len(alphabet) (exclusive).
• gen_words(word_file: str) -> str
  • Returns one by one the words in a wordfile called word_file.
  • The wordfile must have a word per line.
  • The words are striped from every character that is not contained in the alphabet.

Class (static) methods

• railfence(message: str, rails: int) -> str
  • Railfence cipher, the number of rails must not exceed len(message).
• columnartransposition(message: str, key: str) -> str
  • Columnar Transposition cipher, the key can have repeated letters.
  • All of the key must be either lowercase or uppercase.
  • The message will be padded with X to fill the gaps.
• drailfence(message: str, rails: int) -> str
  • Railfence decipher, the number of rails must not exceed len(message).
• dcolumnartransposition(message: str, key: str) -> str
  • Columnar Transposition decipher, the key can have repeated letters.
  • All of the key must be either lowercase or uppercase.
  • The message may or may not be padded.
  • The message will be transformed into lowercase.