Flashcards

244 L7/8

samuelfoxnz English 8 cards

Cards in this deck (8)

1Explain data encryption and decryptionEncryption - transforming information into a different, unintelligible form.
Decryption -converting encrypted data back into its original form
2What is a Caesar cipher?method of encrypting the data by shifting the character values of the plain text.
Weaknesses: Incredibly easy to crack
3What is a Transposition cipher?Transposition cipher is a form of encryption that takes plain text and splits it into a 2D array sending each column out of order.
4Explain how a digital signature is generated using the Public Key cryptosystemSender encrypt message with private key, send public key along with encrypted message to the Receiver. Receiver then decrypts with senders public key.
5Explain symmetric-key encryption, private key encryptionSymmetric-key encryption, sender and receiver use the same key to encrypt and decrypt.
6List the names of three ciphers for symmetric-encryptionData Encryption Standard (DES), Caesar cipher and Transposition cipher.
7Describe the steps that a sender and receiver should follow using the public-key cryptosystems to transmit a message. Explain why messages transmitted by public key cryptosystems are secure.Encryption and decryption functions are split.
Encryption key is public and the decryption key is private.
Only receiver has private key
8What is a digital signature?A mathematical scheme for demonstrating the authenticity of a digital message or documents