CryptoPhone PSTN1i

Encryption

Utilizes 256-bit AES and Twofish session encryption for secure communication.

Key exchange

Implements a 4096-bit Diffie-Hellman key exchange for secure key establishment.

Key authentication

Uses readout-hash based key authentication to verify the integrity of exchanged keys.

Session key management

Generates new session keys for each call and destroys them after the call concludes.

Dual mode operation

Allows switching between clear and secure modes for calls on the same line.