The data sets contains of 6 byte KEY A, 3 byte access bits, 1 byte user data and 6 byte KEY B. Block 3 of each sector can not be used for data (“Sector Trailer”) (except for byte 9), but contains the applicable access keys and access bits. Sector 0, Block 0 contains the UID (either 4 byte or 7 byte) and further manufacturer information. The mostly used Mifare Classic chips come with 1k of memory, which are split into 16 sectors, with 4 blocks each. The version covered on this page is Mifare Classic, which has a very bad history of being hacked, cracked and broken… Mifare Classic Protection here has to be applied on application layer and has to cover the risk of cloning the card. As such their read protection is just as good as the protection of a printed piece of paper. They don’t have any means of protection / encryption except for the optional write protection.
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