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A method and apparatus for extending the improved security of the private key of the lookup table to improve the security of wireless phone messages
A method and apparatus for extending the improved security of the private key of the lookup table to improve the security of wireless phone messages
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机译:用于扩展查找表的私钥的改进的安全性以提高无线电话消息的安全性的方法和装置
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摘要
An enhancement to the use of a tbox function for CMEA encryption. Offsets are generated for application of the tbox function to a message, using secret values and previously encrypted message octets. The offsets are used to permute the message for application of the tbox function. For the first message of a call, the previously encrypted message octets are replaced by an initialization value. In a system employing a single iteration of CMEA encryption, first and second offsets are generated. In a system employing two iterations of CMEA encryption, first, second, third and fourth offsets are generated, with the first and second offsets being used in the first iteration of CMEA encryption and the third and fourth offsets being used in the second iteration of CMEA encryption.
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