Saiko Labs
A routine XORs the flag with a constant. Undo it.
Decompiled check. Flag bytes XOR'd with 0x7e:
unsigned char enc[] = { 0x0d, 0x1f, 0x17, 0x15, 0x11, 0x05, 0x0e, 0x1b, 0x1b, 0x12, 0x21, 0x0a, 0x16, 0x1b, 0x21, 0x1a, 0x1f, 0x1b, 0x13, 0x11, 0x10, 0x03 };