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A puzzle concerning techniques for secure communication in the presence of (hostile) third parties. Do NOT use this for simple "crack the code" problems; use [cipher] instead.

This tag is for puzzles involving cryptography. Cryptography is the art of secure communication in the presence of (hostile) third parties. For simpler "crack the code" type problems use instead.

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.