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Cryptography

Cryptography. The Science of Secret Messages. Secret Messages. CODING “ONE IF BY LAND, TWO IF BY SEA” STEGANOGRAPHY “ A LOVELY ICING COVERED ÉCLAIR” CRYPTOGRAPHY. Terminology in Cryptography. The PLAINTEXT is the message that will be put into secret form.

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Cryptography

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  1. Cryptography The Science of Secret Messages

  2. Secret Messages • CODING “ONE IF BY LAND, TWO IF BY SEA” • STEGANOGRAPHY “A LOVELY ICING COVERED ÉCLAIR” • CRYPTOGRAPHY

  3. Terminology in Cryptography • The PLAINTEXT is the message that will be put into secret form. • The CIPHERTEXT is the message in secret form. • The CIPHER ALPHABET is the set of symbols used for the ciphertext.

  4. ENCIPHERMENT or ENCRYPTION is the process of transforming plaintext to ciphertext. • DECIPHERMENT or DECRYPTION is the process of transforming ciphertext to plaintext. • A KEY is an input component of the encryption/decryption process, along with the text. • CRYPTANALYSIS is decipherment without posession of the key.

  5. VENI, VIDI, VICI. C D E I I I I I N V V V Transposition Cipherstranspose the symbols in the plaintext to produce the ciphertext.

  6. VENI, VIDI, VICI. YHQL, YLGL, YLFL. VENI, VIDI, VICI. Substitution Cipherssubstitute cipher alphabet symbols for a letter or group of letters of the plaintext

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