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When you log in to your computer account you probably need to provide some form of password to gain access. After you are authenticated, your system may notify you of a new software patch that should only be installed after its digital signature is verified. Then when you connect to an online merchant, your purchase information travels via a TSL/SSL connection to keep it from being intercepted by criminals.</P>What is common to these activities is the central involvement of cryptology. We depend on cryptographic methods to hide information from unauthorized parties, authenticate data provenance, regulate access to sensitive operations, identify subjects, verify integrity, and protect against counterfeiting – to name only a few uses. Simple encoding and steganographic methods have been known for thousands of years and likely were invented not long after writing itself. Development and use of encryption techniques have been a staple of espionage, warfare, crime, and romance for centuries: secret arrangements for rendezvous, whether to join in a surprise attack, smuggle contraband, or schedule a torrid assignation have all driven the need for private communication.</P>The maturation of the computer and its use in so many different tasks has both motivated and enabled new techniques http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Computers & Security Elsevier
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