No documentation. No mention in the open-source portions of the firmware. Just a hidden binary running on a consumer router.
She extracted it anyway. The hex dump opened in her editor. At first, it looked like random bytes—until she spotted a repeating 16-byte pattern every 272 bytes. That wasn't encryption; it was steganography. s3 ac2100 dual band wireless router firmware
She wrote a quick Python script to isolate those 16-byte blocks and reassemble them. The result was a small, valid ELF executable named ph_conn . No documentation