Crack a Caesar Cipher Easily with CrypTool 2 🔓

#cryptology, #cryptography, #cryptanalysis

In this video, we demonstrate how you can break a Caesar cipher with CrypTool 2 (CT2). First, a Caesar cipher is created with CT2. You will see, how encryption and decryption works with the Caesar component in CT2. After that, we present two different ways of breaking a Caesar cipher in CT2.

1) Break a Caesar cipher with a brute-force search by testing all possible keys
2) Break a Caesar cipher with the help of letter frequency analysis

With both methods, a Caesar ciphertext can be broken instantly. Method 1 is useful for short ciphertexts. Method 2 needs more ciphertext (as you will see in the video), but does not need to test each key.

Download CrypTool 2 from here: https://www.cryptool.org/en/ct2/downloads

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