"I found it, I found it!"
With fifteen seconds left on the countdown, Nianyang's eyes, which had become sore from staring, suddenly sparkled with boundless brilliance.
Following her gaze, Li Tingyan saw that on a thumb-sized dial, in the lower right corner of nine black dark squares, five dark squares were marked with single-letter symbols in vertical arrangement, which added up to wynqs...
Nianyang had studied cryptography. This belonged to Hill cipher, a simple and widely known encryption method.
It's a technique of substitution encryption, with each letter treated as a digit in base-26:
A=0, B=1, C=2...
In other words, converting the numerical order of letters gives the decryption answer.
With ten seconds left, Nianyang solved the password and quickly entered it during the last three seconds, her heart pounding as if it would leap out.
Honestly, she was purely gambling on the pattern of this password.
If she had guessed wrong, they would all be dead today.
