Kryptos is a secure, fully encrypted voice communications application. Kryptos utilizes military grade 256 bit AES encryption to encrypt voice communications before transmission using 2048 bit RSA for key exchange. Developed in alliance with Appetizer Mobile LLC
VoipOneClick is an open source application to make cheap voice calls with great audio quality and a light encryption. You get a real mobile number that can be called from normal phone lines (some limitation can apply due to local telecom operators).VoipOneClick does use RSA certificate 2048 bit, AES 128 chiper and TLS/SRTP protocols to encrypt the communication, that is a light encryption still valid against hackers. The application is ready to be used just after the download without any configuration or registration of personal data.
This is the best solution for your Gmail privacy, the easiest, full-featured email app with Touch ID protection that you will love and use everyday. USER REVIEWS:Some reviews from our users for the Full version: Has ALWAYS worked great for me Love the app (from a US user) I think that this program is far superior than any of its competitors. MMobileDev.com
iPGMail is an app that implements the OpenPGP standard (RFC 4880, RFC 6637) and allows the user to create and manage both public and private (RSA, DSA, ECDSA) PGP keys and send and receive PGP encrypted messages. PGP Keys and Messages can be passed to iPGMail several ways: * From the iOS Mail.app - The iOS mail application will pass PGP attachments to iPGMail directly, eliminating the need to do an awkward copy-and-paste. The OpenPGP standard is described here: http://en.wikipedia.org/wiki/Pretty_Good_Privacy