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Sure. Just concatenate a 256-bit nonce to your PIN, calculate the SHA-512 of the concatenation, and then type the last 4 hex digits of the hash. Easy!


In my head, in less than a few seconds, I can take any PIN, calculate AES-encrypt it with a randomly chosen key, calculate the MD5, multiply the result by 65536, and then quickly type the least-significant 4 hex digits. Is that good enough?




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