Basic Cryptography Module
=========================

Encryption is the process of hiding a message and a cipher is a
means of doing so. Included in this module are both block and stream
ciphers:

 * Shift cipher
 * Affine cipher
 * substitution ciphers
 * Vigenere's cipher
 * Hill's cipher
 * Bifid ciphers
 * RSA
 * Kid RSA
 * linear-feedback shift registers (for stream ciphers)
 * ElGamal encryption

In a *substitution cipher* "units" (not necessarily single characters)
of plaintext are replaced with ciphertext according to a regular system.

A *transposition cipher* is a method of encryption by which
the positions held by "units" of plaintext are replaced by a
permutation of the plaintext. That is, the order of the units is
changed using a bijective function on the position of the characters
to perform the encryption.

A *monoalphabetic cipher* uses fixed substitution over the entire
message, whereas a *polyalphabetic cipher* uses a number of
substitutions at different times in the message.

.. module:: sympy.crypto.crypto

.. autofunction:: AZ

.. autofunction:: padded_key

.. autofunction:: check_and_join

.. autofunction:: cycle_list

.. autofunction:: encipher_shift

.. autofunction:: decipher_shift

.. autofunction:: encipher_affine

.. autofunction:: decipher_affine

.. autofunction:: encipher_substitution

.. autofunction:: encipher_vigenere

.. autofunction:: decipher_vigenere

.. autofunction:: encipher_hill

.. autofunction:: decipher_hill

.. autofunction:: encipher_bifid

.. autofunction:: decipher_bifid

.. autofunction:: bifid5_square

.. autofunction:: encipher_bifid5

.. autofunction:: decipher_bifid5

.. autofunction:: bifid5_square

.. autofunction:: encipher_bifid6

.. autofunction:: decipher_bifid6

.. autofunction:: bifid6_square

.. autofunction:: rsa_public_key

.. autofunction:: rsa_private_key

.. autofunction:: encipher_rsa

.. autofunction:: decipher_rsa

.. autofunction:: kid_rsa_public_key

.. autofunction:: kid_rsa_private_key

.. autofunction:: encipher_kid_rsa

.. autofunction:: decipher_kid_rsa

.. autofunction:: encode_morse

.. autofunction:: decode_morse

.. autofunction:: lfsr_sequence

.. autofunction:: lfsr_autocorrelation

.. autofunction:: lfsr_connection_polynomial

.. autofunction:: elgamal_public_key

.. autofunction:: elgamal_private_key

.. autofunction:: encipher_elgamal

.. autofunction:: decipher_elgamal

.. autofunction:: dh_public_key

.. autofunction:: dh_private_key

.. autofunction:: dh_shared_key

.. autofunction:: encipher_elgamal

.. autofunction:: decipher_elgamal