17.1 Encryption, Encryption Protocols and Digital Certificates

Question 1

Public key

Answer 1

Encryption/Decryption key known to all users.

Question 2

Private key

Answer 2

Encryption/Decryption key known only to a single user.

Question 3

Plain text

Answer 3

Original document before it is put through an encryption algorithm.

Question 4

Cipher text

Answer 4

the product when plain text is put through an encryption algorithm.

Question 5

What is encryption?

Answer 5

Alters the data into a form that is unreadable by anybody for whom the data is not intended for.

Stop it from making sense to them (cipher text).

Question 6

What are the 4 main security concerns when data is transmitted?

Answer 6

Confidentiality: only the intended recipient should be able to decipher data

Authenticity: the need to identify the sender and verify the source is legitimate

Integrity: data reaches destination without any changes.

Non repudiation: neither sender or recipient can deny that they were part of the data transmission.

Question 7

Symmetric key cryptography

Answer 7

encryption in which the same secret key is used to encrypt and decrypt messages.

Question 8

Asymmetric key cryptography

Answer 8

encryption that uses public keys (known to everyone) and private keys (secret keys).