Helensburgh Puzzles #2 - Caeser II Mystery Cache

Helensburgh Puzzles is a series of puzzle caches placed around of the suburbs of Helensburgh, Stanwell Tops and Otford. There are 36 puzzle caches in total, placed in the shape of a puzzle piece. The puzzles are of varying difficulty to encourage to learn about puzzles, codes and how to solve them.

For planning purposes, please see the the Helensburgh Puzzles website.

In puzzle #1, you learned all about the Caesar cypher and how it wasn't really secure for two reasons. So, let's fix that! Note that I still wouldn't trust my private information with this one as it can easily be reversed, but it might keep you busy for a minute.

The container can be found at:

bjglg evugq anqre qahuk vfgbq gutvr lgsvs frret
rqlgs vsqan qreqa hurab gfnrr avalg evugq anqre
qahuk vfgbq riyrj gfrre trqeh bslge vugug hbf.