|
Rail Fence |
In
cryptography, a transposition cipher is a method of encryption by
which the positions held by units of
plaintext
(which are commonly characters or groups of characters) are shifted according to
a regular system, so that the ciphertext
constitutes a permutation of the plaintext. That is, the order of
the units is changed. Mathematically a bijective
function is used on the characters' positions to encrypt and an
inverse function to decrypt.
|
|