TSDETHSIRWEWSIIPOBNCAREGE → 25 characters
Find the square root: Square root of 25 is 5.
Split letters into 5 rows of 5 letters each:
TSDET HSIRW EWSII POBNC AREGE
Now stack them:
T S D E T
H S I R W
E W S I I
P O B N C
A R E G E
Read from top to bottom starting at the top left corner and finishing at the bottom right corner.
Translation: "The password is 'Bee,' ring twice"
