Flashcards
Introduction to Cryptography, Lecture 1
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- 1Define \[\textit{plaintext}\]\[\textit{ciphertext}\]\(\textit{plaintext}\) is the original message in readable form
\(\textit{ciphertext}\) is the encrypted message - 2Method of cryptography Caesar employed?\(\textit{shiftcipher}\), since every letter in the alphabet is shifted up or down
- 3Define \[\textit{simple substitution cipher}\]A cipher in which each symbol is replaced by another symbol
- 4Convenient way to describe the encryption and decryption function of a simple substitution cipherCreate a table by writing the plaintext resp. ciphertext alphabet in the top row and putting the ciphertext resp. plaintext letter below by correspondence
- 5How many simple substitution ciphers exist for the alphabet?\[25!\]
- 6Define \[\textit{key}\] for a simple substitution cipherThe associated encryption table
- 7Define \[\texit{cryptanalysis}\]The process of decrypting a message without knowing the underlying key
- 8Define \[\textit{symmetric ciphers}\]Alice and Bob both share the knowledge of the secret key \(k\)
- 9—
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- User has deleted their subject information Flashcards on Introduction to Cryptography, Lecture 1, created by Deleted user on 10/11/2017.
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- Created by Jörg Schwartz · Jan 18, 2016
- Copied by Abdul Issa · Nov 10, 2017
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