By Yosi Stein and Hazarathaiah Malepati, Analog DevicesEmbedded.com (08/19/08, 02:18:00 PM EDT)
In the modern digital computer world, cryptography algorithms play an important role in securing important data. In early days, cryptography was used to protect classified information in government and military applications. Now, with Internet access is a common commodity, government agencies, various industries ranging from Hollywood to corporate, financial institutions and universities make widespread use of cryptography algorithms in everything from storage management to web based online transaction processing, etc.
Various cryptography algorithms are used in practice, depending on the application type and the required level of security. The block diagram of a general secured communication system is shown in Figure 1 below.
Figure 1: Communication security modules (a) encryption (b) decryption
For communications security, plan text is encrypted using a secret (or shared) key at the transmitter side and then decrypting the ciphered text at the receiver side using the same key. In this secured communication system, tapping the data by adversaries is almost impossible unless he/she gets the secret key pattern. In the present day, an embedded processor is commonly used to implement the physical layer of such a secured communication system.
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