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0x700. CRYPTOLOGY > 0x710. Information Theory

Information Theory

Many of the concepts of cryptographic security stem from the mind of Claude Shannon. His ideas have influenced the field of cryptography greatly, especially the concepts of diffusion and confusion. Although the following concepts of unconditional security, one-time pads, quantum key distribution, and computational security weren't actually conceived by Shannon, his ideas on perfect secrecy and information theory had great influence on the definitions of security.

Unconditional Security

A cryptographic system is considered to be unconditionally secure if it cannot be broken, even with infinite computational resources. This implies that cryptanalysis is impossible and that even if every possible key were tried in an exhaustive brute-force attack, it would be impossible to determine which key was the correct one.


  

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