Uses outdated crypto library

This project is using portable bouncy castle - this is outdated and has been rolled into the main bouncy castle library which is now cross platform. Because of this, users that use the updated library run into ambiguous reference errors .
I would suggest upgrading to the latest version 2.4.0 version at this time.

Start by locating the project reference to portable Bouncy Castle and checking how the current dependency is used. Update the reference to Bouncy Castle 2.4.0, then verify that consumers using the updated library no longer encounter ambiguous reference errors.

Written by the indexing model from the issue text.