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Advancements in Cryptography for Modern Communication Needs

Explore the evolution of cryptographic methods to meet the demands of electronic commerce, online communication, and mobile applications. Discover the challenges in designing secure systems and the transition from classical to modern ciphers. Gain insights into ensuring confidentiality, integrity, authenticity, identification, and non-repudiation in digital communication.

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Advancements in Cryptography for Modern Communication Needs

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  1. Time changes: Earlier secret tactical com-munication involving few people are replaced by other environments and applications due to computers. Electronic commerce, www-communication, and mobile communication introduce other needs that we try to satisfy with cryptographic methods. Crypto-based methods are a mean för achieving these goals. Analyses of classical ciphers are often based on results from probability theory while modern public-key methods are based on number theory and abstract algebra. Designing a whole system correctly is very difficult. It is a well-known fact that many standard methods have weaknesses making them easy to ”crack”. CryptologyFrom paper and pencil, mechanical devices to computers • We would like to: • ensure confidentiality (as above) • be sure sure that information has not been tampered with (integrity) • know that the data origin is authentic • be convinced that the user is as claimed (identification) • stop a sender from denying messages sent (non-repudiation) A real classical cipher. Spartan, circa 2500 years of age. Preresquisites: Algorithms and data structures, operating systems, and algebra. Goal: To convey knowledge and abilities on algorithms and protocols for the services listed on the left.

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