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The area of computational cryptography is dedicated to the development of effective methods in algorithmic number theory that improve implementation of cryptosystems or further their cryptanalysis. This book is a tribute to Arjen K. Lenstra, one of the key contributors to the field, on the occasion of his 65th birthday, covering his best-known scientific achievements in the field. Students and security engineers will appreciate this no-nonsense introduction to the hard mathematical problems used in cryptography and on which cybersecurity is built, as well as the overview of recent advances on...

Tourism as an activity is increasingly being criticised for its exploitative and extractive industrial approaches to business. Yet, it has the power to transform and to regenerate societies, cultures and the environment. The desire to explore the world around us is deeply embedded in many people's psyche, but it comes at a cost to the environment and often to the residents of the visited communities. Much of tourism education has been closely linked to preparing students for future professional practice, but the challenges and opportunities linked to its consumption require that its future...

Richtige Entscheidungen bestimmen über den Erfolg im Berufsleben. Wie man zielgerichtet und mit System entscheidet, veranschaulicht dieser Ratgeber. Beispielsweise mithilfe der Szenariotechnik, die zur bestmöglichen Entscheidung führt. Die Autoren beschreiben Entscheidungsprozesse und Methoden so verständlich, dass man sie im Berufs- wie im Privatleben leicht einsetzen kann.

This book highlights the many ideas and algorithms that Peter L. Montgomery has contributed to computational number theory and cryptography.