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A puzzle concerning techniques for secure communication in the presence of (hostile) third parties.

Cryptography is the art of secure communication in the presence of (hostile) third parties.

More precisely, Cryptography

  • constructs and analyzes protocols that block third parties
  • deals with aspects in information security as data confidentiality, data integrity, authentication
  • applies techniques from mathematics, computer science, and electrical engineering.

Everyday applications of cryptography include ATM cards, computer passwords, and electronic commerce.

There is a Stack Exchange site dedicated to Cryptography, please use this if your questions are of a more serious nature.

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