White Hat Institute

“Defend the Web” write-up (Crypt 4 / Crypt)

Defend the Web – (Crypt 4 / Crypt – decrypting ciphertext using online decryptors)

A Caesar cipher, also known as Caesar’s cipher, the shift cipher, Caesar’s code, or Caesar shift in cryptography, is one of the most basic and well-known encryption schemes. It’s a substitution cipher in which each letter in the plaintext is replaced by a letter that’s a certain number of positions down the alphabet. With a left shift of 3, for example, D would become A, E would become B, and so on. Julius Caesar is credited with inventing the approach, which he utilized in his private communication.

In this challenge, the cipher is already given. All you need to do is to crack it by using any available online craking platform.

Let’s get started.

Highlight the ciphertext from the challenge page and copy it down.

Defend the Web crypt4_1

Go to any online decryptor site like “https://quipqiup.com/ and paste it there to reveal the message.

Defend the Web crypt4_2

Find the password and type it down in the password field to pass the challenge.


The Caesar shift doesn’t hold up as well by today’s standards due to its restricted number of shifts and vulnerability to letter frequency analysis, but it’s a lot of fun to solve and design puzzles with this method.