diffie hellman

Question 1

what type of encryption is diffie hellman

Answer 1

symmetric key encryption

Question 2

what does diffie hellman do

Answer 2

it generate a symmetric key for both alice and bob so they cn communicate publicly

Question 3

how does it generate the key

Answer 3

a -> alice private key
b -> bob private key
g^a mod p -> alice public key
g^b mod p -> bob public key
alice sends the result of g^a mod p to bob
bob sends the result of g^b mod p
then
then alice and bob both calculate g^(ab) mod p (or g^(ba) mod p) which is basically their shared key for communication

Question 4

what are the constraints for g and P

Answer 4

g < p
gcd(g , p-1) = 1
p is a prime number

Question 5

what attack is diffie hellman susceptible to

Answer 5

man in the middle attack

Question 6

decribe the man in the middle attack

Answer 6

this is so long right now , just check your notes in the black book

Question 7

what are the weaknesses of diffie hellman

Answer 7

susceptible to man in the middle attacks
computational complexity
key size has to always be large