FAQ?
What is the Caesar cipher? (Definition)
The Caesar cipher (or Caesar code ) is a monoalphabetic substitution cipher, where each letter is replaced by another letter located a little...Read more
How to encrypt using Caesar cipher?
Encryption with Caesar code is based on an alphabet shift. The most commonly used shift/offset is by 3 letters. Plain Alphabet ABCDEFGHIJKLMNOPQR...Read more
How to decrypt Caesar cipher?
Caesar code decryption replaces a letter another with an inverse alphabet shift: a previous letter in the alphabet. Example: Decrypt GFRGHA...Read more
How to recognize Caesar ciphertext?
A message encoded with the Caesar cipher has a shift in its frequency analysis diagram (equal to the selected shift) and a coincidence index...Read more
How to decipher Caesar without knowing the shift?
The easiest keyless/shiftless method consists of testing all shifts, if the alphabet has 26 letters, it takes only 25 tries (dCode does it automati...Read more
What are the variants of the Caesar cipher?
Caesar cipher is best known with a shift of 3, all other shifts are possible. Some shifts are known with other cipher names. Another variant chang...Read more
How to encrypt digits and numbers using Caesar cipher?
Caesar cipher is applicable only to letters of the alphabet. There are, however, several solutions to crypt numbers: — Write the numbers in Rom...Read more
Why the name Caesar Cipher?
Caesar (Caius Iulius Caesar) used this technique for some correspondences, especially military, for example with Cicerone (shift of 3).Read more
What is August Cipher?
August Cipher is sometimes the name given to Caesar Cipher with a shift of 1.Read more
What is the A1Z26 cipher? (Definition)
The Letter-to-Number Cipher (or Number-to-Letter Cipher or numbered alphabet) consists in replacing each letter by its position in the alphabet ,...Read more
How to encrypt using Letter-to-Number/A1Z26 cipher?
A1Z26 encryption requires to count the positions/ranks of letters in the alphabet. If it is the Latin alphabet of 26 characters here is the corres...Read more
How to decrypt Number-to-Letter cipher?
Decryption requires taking each number and replace it with the letter of same position in the alphabet : 1 = A, 2 = B, … 26 = Z A B C D E F G H I...Read more
How to recognize Letter-to-Number ciphertext?
The crypted message is made of numbers between 1 and 26, sometimes the number 0 is used to code a space. The digit 5 for E is supposed to appea...Read more
What are the variants of the Letter-to-Number cipher?
Shift of numbers: the alphabet can start with A = 0 or A = 1, but also A = 65 or A = 97 ( ASCII code ). Use of a supplementary character for space...Read more
How do you encrypt the letters of the alphabet?
To encrypt D, take the alphabet and look 3 letters after: G. So D is encrypted with G. To encrypt X, loop the alphabet: after X : Y, after Y : Z, after Z : A. So X is coded A. Another way to crypt, more mathematical, note A=0, B=1, ..., Z=25, and add a constant (the shift), then the result modulo 26 (alphabet length) is the coded text.
What is the letter-to-number cipher?
The Letter-to-Number Cipher (or Number-to-Letter Cipher) consists in replacing each letter by its position in the alphabet, for example A=1, B=2, Z=26, hense its over name A1Z26.
How is the ciphertext alphabet generated?
For this reason, as with most ciphers, a keyword is often used. The ciphertext alphabet is then generated using this keyword as follows: the keyword is first written, ignoring any repeated letters, and then the remaining letters of the alphabet are written in alphabetical order.
How to find the most commonly used letters of the alphabet?
Frequency analysis can be used to find the most commonly used letters. A Caesar Cipher is a special kind of cryptogram, in which each letter is simply shifted a number of positions in the alphabet. It can easily be solved with the Caesar Cipher Tool. A ROT13 Cipher is similar to a Caesar Cipher, but with a fixed shift of 13 letters.
