RailMail

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.

Short writeup

Challenge based on RailFence cipher. Sum of key and offset is given. Simple bruteforce needs to be done to get actual key and offset. Online tools can be used to solve the same.

Challenge Author

4lph4

Flag

shaktictf{Aw3s0m3_k33p_Go1n9!}