Mips Mops

spbctf

Task: stripped MIPSEL PIE keygen validating a 32-char serial; the flag IS the correct serial. Solution: statically reverse the 64-bit-on-32-bit transform (fixing a compiler-emitted word-swapped multiply constant), build a Python forward model validated against qemu-user, then invert the check with z3 and pairwise equation solving, resolving an uninitialized A[7] stack slot via surrounding readable text.