3 features: 1) Sign a JAR file (main function) Objective: ensure integrity (protection) and certification of the file. 2) Create private keys Objective: create a key to be used (or reused) to sign JAR files. 3) Manage private keys Objective: change aliases, passwords, copy/delete entries, ...

Create small (~40Kb) self-checking signature (exe-file) for folder contents. Based on SHA-1. Allows receive list of modified and removed files.