A smartphone application to encrypt would need key management. An inexpensive ($1/month) service could provide the key management to enable people who have not yet set up keys to easily use public keys for the phone call.
The key servers should have geographical dispersion in different political jurisdictions.
Available in google play app store:
- HushCrypt is a mobile application which allows registered users to dial and receive encrypted phone calls using internet connection through WiFi or 3G. Both persons involved in a call must have the HushCrypt application installed and active on their phones in order to talk securely
- 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. Kryptos provides VoIP connectivity for secure calls over 3G, 4G and WiFi. Users will download and install the client software and must then activate their account with Kryptos. Users will create their own personal unique individual ID. Encrypted, secure calls are made peer-to-peer. Both users must have the software in order to use the functionality.
RedPhone
An application that provides encrypted voice calls for Android.
On related idea, there are several smartphone TOR clients.
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