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#DECIPHER TEXT MESSAGE SOFTWARE CRACK#

English has a fairly predictable distriution of letters in any decent sized amount of text:Īll of the different keys used in the Caesar cipher will just shift this distribution by some number of places.

#DECIPHER TEXT MESSAGE SOFTWARE CRACK#

Since there are only 25 possible ways to encrypt a message using a Caesar cipher, a person who wants to decrypt it simply has to try 25 different keys until something meaningful is used.Īnother interesting way to crack a Caesar cipher is to look at the distribution of letters. Here's a diagram showing the shifting process for a key of -3:Īs I said earlier, the caesar cipher is extremely easy to crack if one suspects that some sort of substitution cipher has been used to produce some encrypted text. So if we use Caesar encryption on the word "EAT" with -3 as our key, we end up with "BXQ". Finally, we move T three spots back and get: T>S>R> Q.Since it's at the start of the alphabet, we rotate back around to the end: A>Z>Y> X, so we end up with the letter X as the encrypted version of A. Likewise, the next letter, A, gets moved backward by 3 letters.

So in our example, the letter E would get moved backwards (remember we chose a negative number) three spaces.

For each letter of your text, move it along the alphabet by a number of places defined by our key.

This will be our "key" that will allow us to encrypt and decrypt the message.

First, choose some text that you want to encrypt.

The Caesar cipher is one of the earliest and simplest ciphers that were invented.

Note: The number in the bottom right corner of the first box is where you write how many "shifts" or "rotations" you want in the cipher.