Kryptotel App  protects your privacy at the maximum level, here a  summary of the main security features adopted:

  • Asymmetric Encryption based on RSA certificates and private Key long 4096 bits. Such key length derives from  military requirements, in the commercial world the longer keys are 2048 bits. For example any on-line banking system is using RSA 2048 bits.


  • Symmetric encryption based on AES 256 bits, this is the longer key usable with the well know AES cipher. For your knowledge many on-line banking system are using AES 128 bits and only a few AES 256 bit.
  • Digital signature based on SHA512, it means signature long 512 bits instead of the usually 128 bits;
  • True random number generator for the session key (additional randomness feed from camera and touch screen);
  • Flat Voice codec to avoid any attempt to decrypt the talking based on the amount of bit transmitted;
  • User data fully encrypted with your access password to be resistant to any forensic analysis.
  • Full encryption of voice, text messages , photo,video,files attached and setup data.
  • Audio-firewall to stop any listening to your microphone from other programs during the talking session.
  • Certificate pinning, it does mean that the RSA certificates cannot be forged even from governments agencies. We don’t trust the system of public recognised Certification Authorities and Kryptotel uses only its own certificates.
  • Encrypted Voice Mail always based on AES 256 bits.
  • Additional security even when calling a normal phone number (Black Out Call).