Caesar’s Secret

Challenge Description

Julius Caesar used a simple substitution cipher to protect his military communications. In this challenge, you’ll need to decrypt a message that has been encoded using the classic Caesar cipher.

Background

The Caesar cipher is one of the earliest known encryption techniques. It works by shifting each letter in the plaintext by a fixed number of positions down the alphabet. For example, with a shift of 3:

• A would become D
• B would become E
• C would become F
• …and so on

The Challenge

The following message has been encrypted using a Caesar cipher:

WKLV LV WKH VHFUHW PHVVDJH: WKH IODJ LV KDFNHUIBFDHVDUBFLSKHU

Your task is to decrypt the message and find the flag.

Hints

1. The shift value is between 1 and 25
2. The flag format is HACKERF_SOMETHING

Interactive Solver

Use the tool below to try different shift values and decrypt the message:

Submission

Once you’ve found the flag, submit it in the format: HACKERF{FLAG_TEXT}