Various versions of these cards could be accessed to change the balance, including extracting the key by differential power analysis [edit] Looks like this fin

Various 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...