Most Remnant technology is inert or in a "standby" mode, but some is secured with a decryption grid. Unlocking it requires scanning the correct Remnant glyphs and arranging them in a specific order. The glyphs cannot repeat on any straight line or within a square block of four.
Peebee speculates this could be a safety measure. Even if a method was devised to brute-force hack an interface, it would not work with the decryption grid. Given the devastating consequences when Remnant technology is improperly activated, her analysis seems sound.
The arrangement of the glyphs appears to complete either a password or a code phrase within the grid as a whole. From the little I understand of the Remnant language, they appear to form an almost palindromic "Sator Square" sentence, but the finer meaning would require detailed explanation from the grid's designer.