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Crypto phones are mobile telephones that provide security against eavesdropping and electronic surveillance.
The interception of telecommunications has become a major industry. Most of the world’s intelligence agencies and many private organisations intercept telephone communications to obtain military, economic and political information. The price of simple mobile phone surveillance devices has become so low that many individuals can afford to use them. Advances in technology have made it difficult to determine who is intercepting and recording private communications.
Crypto phones can protect calls from interception by using algorithms to encrypt the signals. The phones have a cryptographic chip that handles encryption and decryption. Two algorithms are programmed into the chip: A key-exchange algorithm for the key agreement protocol and a symmetric-key algorithm for voice encryption.

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