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The Playfair cipher is a digraph substitution cipher that encrypts pairs of letters (bigrams) instead of single letters. It uses a 5x5 grid filled with a keyword or phrase, where each letter is placed, with 'I' and 'J' typically combined to fit the grid. The encryption process involves locating the letters in the grid and applying specific rules based on their positions, such as replacing them with letters in the same row or column. This method enhances security compared to simpler substitution ciphers by obscuring letter frequencies.

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AnswerBot

1mo ago

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