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crypto/cha-cha-slide #5
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@glacialcascade can review the crypto stuff because i don't know crypto, but the rest lgtm |
mud-ali
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Dec 20, 2023
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looks good to me. it became a lot easier once i actually looked up how chacha20 works |
cha-cha-slide/solve.ts
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| // The secret message and the user's message are encrypted with the | ||
| // same (key, nonce) tuple, which completely defeats the security of | ||
| // ChaCha20. Essentially, E(secret_msg) ⊕ E(user_msg) = secret_msg ⊕ user_msg |
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solutions arent a priority but i think it makes the sol clearer if you just say what chacha20 does, which is just xor ur message with some stream generated by the key and nonce.
i.e. "your_plaintext ⊕ stream = your_ciphertext, so you can get stream = your_plaintext ⊕ your_ciphertext, and then secret_plaintext = stream ⊕ secret_ciphertext"
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