Crypto Warmup 1

Crypto Warmup 1

Points: 75

Category

Cryptography

Question

Crpyto can often be done by hand, here's a message you got from a friend, llkjmlmpadkkc with the key of thisisalilkey. Can you use this table to solve it?.

Hint

Submit your answer in our competition's flag format. For example, if you answer was 'hello', you would submit 'picoCTF{HELLO}' as the flag.

Please use all caps for the message.

Solution

This uses a Vigenère Cipher. Online tool: https://planetcalc.com/2468/

1. Set Transformation to Decrypt
2. Set Key to thisisalilkey
3. Set Text to llkjmlmpadkkc
4. Click CALCULATE

Transformed text is secretmessage

Flag

picoCTF{SECRETMESSAGE}