1 / 6

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.

morwen
Télécharger la présentation

Cryptography

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related