RailMail-Traboda-Cryptography-CTF-Write-up

CHALLENGE DESCRIPTION

Joan received a secret mail from her friend, upon looking into it, she found that it contains an encrypted text and sum of key and offset. She is clueless what to do. Help her get the message.

Flag Format: shaktictf{...}

challenge attachment

Analyzing the Challenge-title and description, we can understand that its related to Rail Fence Cipher.

Let’s try using Rail Fence cipher to decrypt the cipher text.

When the key becomes 5 and offset 6, we will get our flag..

Rail Fence cipher decoder

Challenge flag: shaktictf{Aw3s0m3_k33p_Go1n9!}

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