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EncryptionEncryption is the process of protecting voice or data information from being obtained by unauthorized users. Encryption involves the use of a data processing algorithm (formula program) that uses one or more secret keys that both the sender and receiver of the information use to encrypt and decrypt the information. Without the encryption algorithm and key(s), unauthorized listeners cannot decode the message. When the encryption and decryption keys are the same, the encryption process is known as symmetrical encryption. When different encryption and decryption keys are used (such as in a public encryption system), the process is known as asymmetrical encryption.
Encryption Operation
This diagram shows how encryption can convert non-secure information (clear text) into a format (cyphertext) that is difficult or impossible for a recipient to understand without the proper decoding keys. In this example, data is provided to an encryption processing assembly that modifies the data signal using an encryption key. This diagram also shows that additional (optional) information, such as a frame count or random number, may be used along with the encryption key to provide better information encryption protection.
GSM Books
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Introduction to GSM
This book explains the basic components, technologies used, and operation of GSM systems. This book starts with the system components and basic services that the GSM system can provide. You will learn that the key types of GSM devices include single mode and dual mode mobile telephones, wireless PCMCIA cards, embedded radio modules, and external radio modems. You will then discover the different types of available services such as multiple types of voice services, data services, group call, and messaging services. $19.99 Printed, $16.99 eBook |
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