Semiconductor device generating security key, method of generating security key, and method of enrolling security key

A security key generation method of a semiconductor device comprising a PUF cell array, an extraction unit, an unmasking unit, a bit decoding unit, and a block decoding unit connected in series, the method comprising:

• extracting, by the extraction unit, second bits from among first bits while receiving the first bits from the PUF cell array and receiving marking bits indicative of whether the first bits are valid from a non-volatile memory, wherein the second bits are valid bits from among the first bits;
• unmasking, by the unmasking unit, the second bits to provide unmasked third bits by using first mask bits while receiving the second bits from the extraction unit and receiving the first mask bits from the non-volatile memory;
• compressing, by the bit decoding unit, the unmasked third bits to provide fourth bits while receiving the unmasked third bits from the unmasking unit;
• and
• generating, by the block decoding unit, a security key by decoding the fourth bits and second mask bits while receiving the fourth bits from the bit decoding unit and the second mask bits from the non-volatile memory.

A security key enrollment method of a semiconductor device comprising a PUF cell array, an extraction unit, a bit encoding unit, and a block encoding unit connected in series, the method comprising:

• transmitting, by the extraction unit, marking bits indicative of second bits from among first bits to a non-volatile memory while receiving the first bits from the PUF cell array, wherein the second bits are valid bits from among the first bits;
• generating, by the bit encoding unit, first mask bits by encoding the second bits depending on a parity of the second bits while receiving the second bits from the extraction unit, and transmitting the first mask bits to the non-volatile memory;
• generating, by the bit encoding unit, third bits by compressing the second bits;
• and
• generating, by the block encoding unit, helper bits by encoding the third bits, generating second mask bits by masking the helper bits by using the third bits, and transmitting the second mask bits to the non-volatile memory, while receiving the third bits from the bit encoding unit.