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Crypto phone
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.〔(Hackers crack open mobile network ) BBC News Technology〕〔van den Broek, Fabian.(Eavesdropping on GSM: state-of-affairs ), Radboud University, Nijmegen, Institute for Computing and Information Sciences (iCIS).〕 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.
== Prevention ==
For the system to work, both users must have crypto phones logged into crypto mode. As with other phones, the signal is encrypted by GSM but it is also encrypted by the cryptographic chip. When the IMSI-catcher performs a man-in-the-middle attack and disables the GSM encryption, the crypto phone encryption remains intact. Therefore, while the signal is still being intercepted, it can no longer be decoded and fake SMS messages can't be sent as the IMSI-catcher does not have the correct code.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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