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Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/computing/computer-science/cryptography/crypt/v/polyalphabetic-cipher

Brit introduces the polyalphabetic cipher, which creates a lighter fingerprint than the Caesar cipher.

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Computer Science on Khan Academy: Learn select topics from computer science - algorithms (how we solve common problems in computer science and measure the efficiency of our solutions), cryptography (how we protect secret information), and information theory (how we encode and compress information).

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