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Criado por Jörg Schwartz
mais de 8 anos atrás
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Questão | Responda |
Define \[\textit{plaintext}\]\[\textit{ciphertext}\] | \(\textit{plaintext}\) is the original message in readable form \(\textit{ciphertext}\) is the encrypted message |
Method of cryptography Caesar employed? | \(\textit{shiftcipher}\), since every letter in the alphabet is shifted up or down |
Define \[\textit{simple substitution cipher}\] | A cipher in which each symbol is replaced by another symbol |
Convenient way to describe the encryption and decryption function of a simple substitution cipher | Create a table by writing the plaintext resp. ciphertext alphabet in the top row and putting the ciphertext resp. plaintext letter below by correspondence |
How many simple substitution ciphers exist for the alphabet? | \[25!\] |
Define \[\textit{key}\] for a simple substitution cipher | The associated encryption table |
Define \[\texit{cryptanalysis}\] | The process of decrypting a message without knowing the underlying key |
Define \[\textit{symmetric ciphers}\] | Alice and Bob both share the knowledge of the secret key \(k\) |
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