This means that the memory is neither encrypted or signed. In addition, check bytes are used to check UID compliance and lock bytes are used to specify that some pages are read-only.Īs mentioned before, the MIFARE Ultralight Nano (when we talk about the MIFARE Ultralight, we generally refer to the MIFARE Ultralight Nano) has no security. For NXP this byte always takes the value 0x04. The structure is as follows:īyte 0 of the card has, according to the standard, the identifier of the manufacturer. The cards are structured in 16 pages (called sector) of 4 bytes each. The type of security present on the card depends on the category of the chosen card. Its low cost makes it very accessible for many nascent companies wishing to modernize their MIFARE Ultralight cards are contactless cards intended to be used as a user identifier for a service.
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