CyberQuest 2025 - Ecnef liar

Description

Sometimes the key is needed somewhere else than where you would think…

Decrypt the messages.txt using the key: {T1tle_B4ckw4rds}

Extend the flag to match this format: CQ25{...}

Metadata

• Filename: message.txt
• Tags: rail fence

Solution

The title backwards is Rail Fence which is a cipher:

https://cryptii.com/pipes/rail-fence-cipher

The ciphertext is the message: Z4P1ZGIHRGC3

The key should be 3.

The flag is: CQ25{Z1GZ4GCIPH3R}