Ridiculously Simpler Algorithm

Category: Crypto
Points: 976/1000
Captures: 14

Challenge Description:

You cracked me once, now I'm back for revenge with an upgraded defence mechanism!

Files Attached:

Solution:

Tools used:

[Tools]

Looked up the key in factordb, seemed like it was a square number, but couldn't figure out how to move on from there. may try again later

Flag:

no solve