Encryption， Encryption protocols and Digital certifications

The encrypted version of the plain text:

• Plaintext

• Ciphertext

The another name of public/private key, used in asymmetric encryption is:

Difference between symmetric and asymmeteric encryption:

（choose more than one answer)

• Number of keys used

• Length of keys

• Symmetric encryption is more expensive

• Asymmetric encryption has higher risk of compromise

Public key made available to everyone?

• TRUE

• FALSE

Anna has to send an email to Bob containing confidential information. Bob and Anna have never sent emails to each other before.

The first step is for Anna to request that Bob sends her one of his keys.

State the key that Bob sends.

• PUBLIC KEY

• PRIVATE KEY

Message digest is created by using ( ) algorithm.

Any changes to the data will change the digest?

• TRUE

• FALSE

Digital signature made by encrypting the digest using the senders public key.

• TRUE

• FALSE

Answer explanation

Digital signature made by encrypting the digest using the senders PRIVATE key.

How does Asymmetric Encryption work?

1.Sender gets recipients public key

2.Receiver uses their private key to decrypt the messgae

3.Uses public key to encrypt the data

4.Data is sent

Your answer should be like "1234" or "2413"

The process of converting data into a unreadable version:

Answer explanation

Encryption: The process of converting data into a unreadable version

Decryption: Returning encrypted data back to its readable form