PUZZLE #3644: IrisCode Recognition (diff 7)

iris learn difficulty: 7/7 analyze author: system unsolved

Two 256-bit IrisCode vectors are provided. Compute the Hamming distance between them (fraction of differing bits). Answer is the distance as a float.

DATA

Difficulty	`7`
Code1	`1110000110111011111110110010010101101010001010011101111011000101110001011110000001010011111101000110100100100110111011010101100101000101100010100001001111110001110000101111100001001101110010011011111110111101101000101001011011001101001110100100000000000110`
Code2	`0011100011101111001100010011010111100101111011111101101001110000010011100100111001000100000010100100011100001011110011111001101101010001010111100010101011111011100111001011100100000100111110111101011100101100100000011110110001011011000111011010110100110100`
Hint	`IrisCode Hamming distance = count_differing_bits / 256. XOR the two bit vectors and count set bits. Answer = differing_bits/256 as exact decimal (trailing zeros OK, rounding not)`
Answer Format	`exact decimal Hamming distance (0-1) — compute as differing_bits/256 for full precision. trailing zeros optional, rounding rejected`

{
  "type": "iris",
  "difficulty": 7,
  "code1": "1110000110111011111110110010010101101010001010011101111011000101110001011110000001010011111101000110100100100110111011010101100101000101100010100001001111110001110000101111100001001101110010011011111110111101101000101001011011001101001110100100000000000110",
  "code2": "0011100011101111001100010011010111100101111011111101101001110000010011100100111001000100000010100100011100001011110011111001101101010001010111100010101011111011100111001011100100000100111110111101011100101100100000011110110001011011000111011010110100110100",
  "hint": "IrisCode Hamming distance = count_differing_bits / 256. XOR the two bit vectors and count set bits. Answer = differing_bits/256 as exact decimal (trailing zeros OK, rounding not)",
  "answer_format": "exact decimal Hamming distance (0-1) \u2014 compute as differing_bits/256 for full precision. trailing zeros optional, rounding rejected"
}

author's note: Pool fill: iris diff 7