【實用商業app】CryptTalk|最夯免費app-綠色工廠好玩App

CryptTalk - Secure call and instant messaging.Provides maximum communication security and protects your sensitive calls from eavesdroppers!30-day free trial with full features! ** This version allows you to receive secure calls and instant messages for FREE. With a simple and convenient in-app purchase you can subscribe to our service and initiate unlimited calls and send secure instant messages. The 30-day free trial applies to all features. ** CryptTalk's Best Practice methodology ensures maximum security for your voice and instant message communications on your mobile phone. By using CryptTalk, you can be sure that your calls and messages cannot be compromised and what you say or message remains inaccessible to third parties. CryptTalk is an Internet-based communications service, which guarantees communication security without the need for special hardware. Main features: - Secure peer-to-peer calling- Encrypted conference calls (Client side mixed conference support)- Secure instant messaging- Easy to use- 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 carrierMaximum security through Best Practice cryptography: - End-to-end encryption: a central server is not 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- Key exchange: Elliptic Curve Diffie-Hellman with ephemeral keys signed using RSA-2048, end-to-end key exchange- SRTP authentication: HMAC-SHA1- Private key protection: Patented, proprietary method for top 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-2048The system is implemented in such a way that potential hackers are prevented from listening in, even if they have access to CryptTalk's system plans or the App's source code. Not even CryptTalk's developers can access your private data. ========================================Optional In-App Subscription purchase: After the 30-day free trial you can purchase a monthly subscription which will allow you to initiate secure outgoing calls and instant messages. Standard Subscription: Subscribe for only EUR 9.99 EUR (USD 9.99) per month to our Standard service and make unlimited secure calls and send instant messages to any of the up to 15 users you entered in your contact list. Premium Subscription: If you have more than 15 contacts, or you need the conferencing functionality, choose the Premium Subscription service for only EUR 29.99 (USD 29.99) per month. Your iTunes Account will be charged when your purchase is confirmed. Your subscription will automatically renew unless auto-renew is turned off at least 24-hours before the end of the subscription.You can manage your subscription and turn off auto-renewal by going to your Account Settings after purchase.The cancellation of a subscription is not possible during an active subscription period.========================================