I have been looking for a PGP client for my BlackBerry 10 device for awhile now so I was really happy when James pointed out PGpgp to me. PGpgp allows you to encrypt and decrypt PGP messages on your BlackBerry in a native application. The implementation of PGP is actually pretty solid in the app though I really wish it was integrated in the HUB. Currently you have to copy and paste the data into the app to encrypt and decrypt.
If you REALLY need PGP like me I highly recommend checking out PGpgp for $2.99 in BlackBerry World. Once this has Hub integration and headless support it will be awesome!!!