Encryption and hashing

Question 1

What is encryption?

Answer 1

Process of encoding a message so that it can be read only by the sender and the intended recipient.

Question 2

What is Symmetric encryption?

Answer 2

Same key used to encrypt and decrypt message. Both parties need to know key and keep it secret. Could be kept the same or uniquely generated every time.

Question 3

What is Asymmetric encryption?

Answer 3

Two different keys.
Encrypted and decrypted with different keys.
Virtually impossible to work out one key from the other.
Together they form key pairs, one is public key other is private key. Public key can be shared, private key is secret

Question 4

What is hashing?

Answer 4

Change data item into something different

Question 5

What are two uses of hashing?

Answer 5

1. Generating disk addresses for storing data on a random access device
2. Storing and checking passwords