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It is used for encryption.
Posted by waqqas1
CMEA (Control Message Encryption Algorithm), a simple block cipher, is used to encrypt the control channel.
Note that CMEA is not used to protect voice communications. Instead, it is intended to protect sensitive control data, such as the digits dialed by the cellphone user. A successful break of CMEA might reveal user calling patterns. Also sent CMEA-encrypted are digits dialed (all DTMF tones) by the remote endpoint and alphanumeric personal pages recieved by the cellphone user.
Posted by sagitraz
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