compilers HATE him: use this ONE WEIRD TRICK to hide a message...!
summary
Claims a practical steganography method that flips instruction encodings to hide bits by exploiting ModR/M and opcode direction bit collisions, implemented as an encoder/disassembler pipeline that profiles a binary, rewrites register‑register encodings for specific opcodes (add adc sub sbb xor and mov cmp) and emits a working executable. Demo hides an image inside Wireshark with about 23 kilobytes available, runs unchanged, and the source is published as Underwood W stick 86.
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chapters (7)
- 0:00Intro
- 2:00Study on computer programs
- 3:54X66 instruction format
- 5:02Only 3 encoding forms
- 5:53Intel opcode tables
- 7:22Implementation
- 8:48Live demo
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