chariri
I also considered the idea of using a paper-based coil, but after consulting with merchants on Taobao, I found that the cost was far too high.
Normally, this encryption method should actually be called a digital signature, but using the term "encryption" in a forum post feels more understandable to some people.
Initially, I considered using a proper digital signature to generate MD5/SHA1 hashes of the data from Tonglian Information, then encrypting the resulting values and writing them onto the card. However, after considering the possibility that error correction might be needed, I abandoned this idea.
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