CryptTalk

CryptTalk - Secure mobile voice communication and messaging service.

CryptTalk's Best Practice Cryptography ensures maximum security for your voice and instant message communications on your mobile phone. Using CryptTalk you can be sure that your calls or messages cannot be compromised, and what you say or message stays inaccessible to third parties.


Main features:

- Secure peer-to-peer calling
- Encrypted multi-peer conference calls (calls mixed on your handset)
- Secure instant messaging
- Superior voice quality
- Worldwide coverage - as long as you can get online, CryptTalk can be used anywhere on the globe
- Independent of your mobile network, phone number and carrier.

Maximum security through Best Practice cryptography:

- End-to-end encryption: no central server is involved in the encryption process
- Built on the most secure and widely used and audited algorithms
- Media encryption: AES-256 CTR
- Authentication: OTP (RFC4226), SIP Digest
- End-to-end key exchange: Elliptic Curve Diffie-Hellman with ephemeral keys signed using RSA-2048
- SRTP authentication: HMAC-SHA1
- Private-key protection: Patented, proprietary method for enhanced security
- Integrity protection: Signed Voice / IM packets
- RTP control data protection: Secure RTCP
- Perfect Forward Secrecy protection: Full support using ephemeral keys
- Replay Attack Protection: Key exchange with challenge-response
- Man-in-the-Middle (MITM) Protection: Diffie-Hellman key exchange messages signed using RSA-2048

CryptTalk is implemented in such a way that having access to its system plans or the App's source would not help a potential hacker or eavesdropper. Not even CryptTalk's developers can monitor your communications or access your private data.






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You can choose from the following four subscription packages:

CT-5
Subscribe for only EUR 9.99 (USD 9.99) per month to our CT-5 service and make unlimited secure calls and send instant messages to up to 5 users on your contact list.

CT-10
Subscribe for only EUR 19.99 (USD 19.99) per month to our CT-10 service and make unlimited secure calls and send instant messages to up to 10 users on your contact list.

CT-15
Subscribe for only EUR 29.99 (USD 29.99) per month to our CT-15 service and make unlimited secure calls and send instant messages to up to 15 users on your contact list.

CT-MAX
If you have more than 15 contacts, or you want to make conference calls, choose the CT-MAX service for only EUR 44.99 (USD 44.99) per month, and make unlimited secure calls and send instant messages to an unlimited number of contacts.


Your iTunes Account will be charged when your In-App purchase is confirmed. Your subscription will automatically renew unless auto-renew is turned off at least 24-hours before the end of your subscription. (You can turn off auto-renew under “Account Settings”.)
It is not possible to cancel your subscription mid-course.