Clear it in 3 steps
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Start the environment
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Investigate the target
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Submit the flag
All challenges
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Programming - Known-Plaintext Attack
Mission
known.txt and ciphertext.b64 are generated from the FLAG injected at startup. Derive the repeating XOR keystream from known plaintext and decrypt RESULT to recover the flag.
Hints
Hint 1 Show
Inspect known.txt and ciphertext.b64 and identify the target record
Hint 2 Show
derive the repeating XOR keystream from known plaintext and decrypt RESULT
Hint 3 Show
Verify that the reconstructed value has FLAG{...} format