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by amluto
3274 days ago
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You set up an secure session (e.g. TLS, but you wouldn't do it that way) and send the 4 digit number over it. Or you use any standard cryptosystem with appropriate security guarantees (RSA-OAEP, AES-GCM, you name it). What you don't do is shove the 4 digit number straight into an ECB mode cipher. |
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