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Frequently Asked Question - What is the meaning of 6E 00 when I send a command to a Smart Card

What is the meaning of 6E 00 when I send a command to a Smart Card

According to ISO 7816-4 0x6E00 means "Class not supported". The class (CLA) byte is usually 0x00, 0xA0, 0xC0 or 0xF0 and sometimes masked with 0x0C that indicates Secure Messaging on some cards. AFAIK, the only invalid CLA value is 0xFF

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