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PlayfairCoder
- Playfair密码(英文:Playfair cipher 或 Playfair square)是一种替换密码,1854年由查尔斯• 惠斯通(Charles Wheatstone)的英国人发明。-Playfair password (English: Playfair cipher or Playfair square) is a substitution cipher, invented in 1854 by Englishman Charles Wheatstone (Charle