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Yubikey Data Format
128-bit dataframe contains 48-bit “secret” ID, counters, timestamp, random number and CRC
128-bit dataframe encrypted with secret AES 128-bit key
“public” ID (6 bytes, 48 bits) prepended
22 byte (176 bit) sequence “modhex”d to 16-character alphabet using most common 16 keys across a wide range of Latin keyboards