Security circuit including dual encoder and endecryptor including the security circuit

A security circuit comprising:

• a first permutation logic circuit configured to output a first decoding value;
• a second permutation logic circuit configured to output a second decoding value;
• a first encoder comprising a plurality of first row gates configured to receive the first decoding value, wherein the first encoder is assigned with first phenotypes based on a certain Hamming weight value as an output of the plurality of first row gates and is configured to output one of the first phenotypes assigned to one of the plurality of first row gates as a first encoding value in response to a binary number having a bit value of 1;
• and
• a second encoder comprising a plurality of second row gates configured to receive the second decoding value, wherein the second encoder is assigned with second phenotypes based on a certain Hamming weight value as an output of the plurality of second row gates and is configured to output one of the second phenotypes assigned to one of the plurality of second row gates as a second encoding value in response to a binary number having a bit value of 1.

An endecryptor comprising:

• an input terminal configured to receive input data from an external device;
• an S-box configured to generate output data encoded or decoded from the input data received via the input terminal;
• and
• an output terminal configured to output the output data,
• wherein the S-box comprises:
• a decoder configured to output a decoding signal in response to the input data;
• a first encoder configured to output one of first phenotypes corresponding to any one among integers in N-decimal (N is a natural number of 1 or more) as a first encoding value in response to the decoding signal;
• and
• a second encoder configured to output one of second phenotypes corresponding to any one among integers in N-decimal as a second encoding value in response to the decoding signal, and
• the output data is a result of a logic operation performed on the first encoding value and the second encoding value.