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Cryptography is both the practice and study of the techniques used to communicate and/or store information or data privately and securely, without being intercepted by third parties. This can include processes such as encryption, hashing, and steganography. Until the modern era, cryptography almost exclusively referred to encryption, but now cryptography is a broad field with applications in many critical areas of our lives.

Learn Cryptography is dedicated to helping people understand how and why the cryptographic systems they use everyday without realizing (such as banking transactions, logging in to Facebook, etc) are secure and protected from malicious hackers and identity thieves.

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The Playfair Cipher

The Playfair Cipher encrypts pairs of letters (digraphs) instead of single letters as in the regular substitution ciphers of the time, making Frequency Analysis significantly harder to perform