An internal challenge author invented a protocol. Naturally, this went well.
An internal challenge author invented a protocol. Naturally, this went well.
Reason through the deliberately flawed construction and recover the lab-only secret.
This challenge uses SPECTER.GHOST training material only. Do not target the public portal or systems outside assets explicitly supplied by the lab.
TRAINING NOTE scheme = base64(xor(message, repeating_key)) key = "SG" ciphertext = "ACAnIzgsJCo0OyI+JD8rNyoqPyI=" Recovered analyst note: "Custom crypto is not encryption design." marker phrase: dont_invent_crypto
The protocol description itself reveals why the construction is weak. The analyst marker is the flag payload.