In Pictures: 20 security and privacy apps for Andr...
Kryptos uses 256-bit AES encryption to encrypt voice communications before transmission (using 2048 bit RSA for key exchange). Provides VoIP connectivity for secure calls over 3G, 4G and WiFi.
Available for: Android and iPhone
Cost: Free to download, monthly service fee of $10
Average marketplace rating: 3.3 stars
In Pictures: 20 security and privacy apps for Androids and iPhones