Author: Cyberdev
Date: 2026-03-08 23:31
Summary: First writeup for this challenge
A full reverse engineering walkthrough of toasterbirb's FPDTP — a covert channel challenge where two binaries communicate by encoding messages into Unix file permission bits. Covers static analysis with strings/objdump, discovering the shared /tmp/fpdtp_pipe channel, building a real-time Python interceptor, and reverse engineering the nibble-split encoding scheme to decode the full conversation. No prior knowledge of covert channels required — everything is explained from scratch.
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