<div style="font-family: Arial, sans-serif; font-size: 14px;"> </div><span>Hello,</span><div><br></div><div><span>I would like to submit for the list's evaluation a symmetric encryption algorithm, LABYRINTH©, together with a public cryptanalysis challenge built around it.</span></div><div><br></div><div><span>LABYRINTH is based on an internal state of 1,000,000 bytes (large-scale homophonic substitution), whose evolution is driven by three parameters derived from a 512-bit key. The state evolves through block exchange and cyclic rotation, with a variable transition frequency tied to the session NONCE.</span></div><div><br></div><div><span>The challenge has already been launched, on September 3, 2026, and is currently open. The full technical documentation, the ciphertext for the challenge, and the challenge rules (prize: USD 20,000 for the first person to recover the plaintext) are available at www.cifrare-documenti.com</span></div><div><br></div><div><span>I'm well aware that the real test of an algorithm is independent analysis, not the designer's own claims. I welcome any critical feedback, on the challenge itself or on the underlying design.</span></div><div><br></div><div><span>Thank you for your attention,</span></div><div><span>Giuseppe Corallo</span></div><div><span><a target="_blank" rel="noreferrer nofollow noopener" href="mailto:labyrinth-chall@proton.me">labyrinth-chall@proton.me</a></span></div><div><br></div><span>---</span><div style="font-family: Arial, sans-serif; font-size: 14px;" class="protonmail_signature_block"><div class="protonmail_signature_block-proton">
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