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