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* inrodaction today's information society, cryptography has become one of the main tools for privacy, trust, access control, electronic payments, corporate security, and countless other fields. The use of cryptography is no longer a privilege reserved for governments and highly skilled specialists, but is becoming available for everyone. As the inventor and developer of the Secure Shell technology, SSH Communications Security has been involved in research and development in cryptography since 1995. * preface By encryption, we mean a process of converting information to a disguised form in order to send it across a potentially unsafe channel. The reverse process is called decryption. Using strong encryption techniques, sensitive, valuable information can be protected against organized criminals, malicious hackers, or spies from a foreign military power, for example. Indeed, cryptography used to be almost exclusively a tool for the military. However, in moving into an information society, the value of cryptography in everyday life...

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