Caesar Cipher:
Also known as Caesar's cipher, the shift cipher, Caesar's code or Caesar shift, is one of the simplest and most widely known encryption techniques.
It is a type of substitution cipher in which each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet.
For example, with a left shift of 3, D would be replaced by A; E would become B, and so on. The method is named after Julius Caesar, who used it in his private correspondence.
ROT13 is a Caesar cipher, a type of substitution cipher. In ROT13, the alphabet is rotated 13 steps.
KEY:
A= X N= K
B= Y O= L
C= Z P= M
D= A Q= N
E= B R= O
F= C S= P
G= D T= Q
H= E U= R
I= F V= S
J= G W= T
K= H X= U
L= I Y= V
M= J Z= W
Plain:ABCDEFGHIJKLMNOPQRSTUVWXYZ
Cipher:XYZABCDEFGHIJKLMNOPQRSTUVW
When encrypting, a person looks up each letter of the message in the "plain" line and writes down the corresponding letter in the "cipher" line.
Plaintext:
SOMETIMES BEING ALONE IS GOOD BUT IT WAS NEVER RIGHT.
Ciphertext:
PLJBQFJBP YBFKD XILKB FV DLLA YRQ FQ TXP KBSBO OFDEQ.
*Deciphering is done in reverse, with a right shift of 3.*
