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I was hoping the author would also discuss a bit more about the security / encryption side of it. If transactions are done only between the card and the reader,
by alexmuresan 1mo ago
I was hoping the author would also discuss a bit more about the security / encryption side of it. If transactions are done only between the card and the reader, could one use a reader at home to alter the balance? If you can load the card on you phone I assume you can use the phone to read it, but that might not be true.
Anyway it was a great read! Glad to see somebody writing without (obvious) use of LLMs.
- KateLawson 1mo agoVarious versions of these cards could be accessed to change the balance, including extracting the key by differential power analysis [edit] Looks like this finally became public recently https://www.techtimes.com/articles/321138/20260721/japan-confirms-cryptographic-flaw-legacy-sony-felica-cards-no-patch-available.htm https://www.techtimes.com/articles/321138/20260721/japan-con...