Label: hand-worked XOR bit table. The optional file contains the three-byte sequence listed below. Historical script observations are recorded separately.

Worked: 0x40 XOR 0x01.
0100 0000
0000 0001
0100 0001 = 0x41
Second pass with 0x01 returns 0x40.

Activity: 0x52 XOR 0x01.
0101 0010
0000 0001
0101 0011 = 0x53
Second pass with 0x01 returns 0x52.

Optional three ciphertext bytes in xor-puzzle.bin: 11 22 33.
Same key 0x01. Predicted plaintext hex: 10 23 32.