As shown in figure 1, use this symmetric encryption model to complete the following table

Q#

Question

Answer

A.     

What is the main goal of using symmetric encryption model?

The main goal of using symmetric encryption model is to maintain data confidentiality, data integrity and symmetric encryption algorithm is fast and efficient on large amount data. In encryption process it will convert plaintext into cipher text(non readable format).

B.     

What are the two requirements for the secure use of symmetric encryption?

1-     Encryption Algorithm (Eg: DES, AES)

2-     Secret key shared by sender and recipient

C.     

What is plaintext?

Plaintext is nothing but readable (either machines or humans) form of a data. In simple we say like unencrypted data.

D.     

What does encryption algorithm mean? Explain your answer.

Encryption algorithm means, a mathematical process of encoding the plain text into cipher text by using a encryption key(secert key). Whenever we have applied a encryption algorithms (Eg.DES) on plaintext, based on instructions on the algorithm it will encode (encrypt) the data into non readable format which is called cipher text.

E.      

What does the secret key do? Explain your answer.

Secret key is nothing but a piece of code or information which is shared to both the sender and recipient. Which is used in the process of encrypting and decrypting the data. Without this secret key the sender can't able to encrypt the data as well as recipient also can't able to decrypt the data.

F.      

What is ciphertext?

Cipher text is nothing but, the output of encryption algorithm. Which is in the form of non readable.

G.     

What is the decryption algorithm? Explain your answer.

Decryption algorithm means, a mathematical process of converting the endoded information into original form i.e plain text by using the secret key (encryption key). In simple we can say that it is a reverse process of encrypting algorithm.