Hacktoria — The Sleeper Cell

Ok, this was quick and pretty straigthforward. I solved it in four steps:

1. Decode layer 1 (base64). I did it using cyberchef
2. Analyze layer 2 (Vigenere Cipher). I used boxentriq analyzer (https://www.boxentriq.com/code-breaking/cipher-identifier)
3. To decipher layer 2 you have to use key. It’s in the briefing (Androktasiai)
4. Use boxentriq again (https://www.boxentriq.com/code-breaking/vigenere-cipher) to solve the final step and get the flag.