some Questions on network securty

Q3 What is avalanche effect?

Q4 Which is batter a high level of avalanche effect or a low one and why?

Q5 What is Diffusion and what provides it?

Q6 What is Confusion and what provides it?

Q7 In Feistel Cipher Structure Design Parameters:

1-Having a large block size gives greater security why? 2- Having a large key size gives greater security why?

Having a complex subkey generation algorithm gives greater security why?

Having a complex round function and multiple rounds gives greater security why? Q8 Explain the basic concept of Feistel Cipher?

Q9 what is the ideal block cipher key length of a message of 512 bit?

Q10 what is the difference between AES-128 and AES-256?

Q11 in AES-128 why do we use key Expansion and why we expand the key to 44 words not 40 words?

Q12 in AES what is the purpose of substitute Bytes Transformation?

Q13 AES Key Expansion algorithm provides what kind of transformation?

Q14 Draw the AES key Expansion process from W0W1W2W3 to get W4W5W6W7 and draw the G function used in this process: