The principles and practice of cryptography and network security stallings cryptography and network security seventh edition introduces the reader to the compelling and evolving field of cryptography and network securityin an age of viruses and hackers electronic eavesdropping and electronic fraud on a global scale security is paramount. In the digital age cryptography has evolved to address the encryption and decryption of private communications through the internet and computer systems a branch of cyber and network security in a manner far more complex than anything the world of cryptography had seen before the arrival of computers where cryptography comes from. Without cryptography e commerce as we know it would be impossible since online security threats evolve so quickly there are dozens of different schools of thought on how best to use encryption to enhance network security not just for governments but for businesses and end users too classical encryption techniques
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