RC test series

Question

consider the private key cryptosystem has 3 keys,3 plain texts and 4 cipher texts

K={k1,k2,k3}

M={m1,m2,m3}

C={c1,c2,c3,c4}

 

 

Comments

why B) correct for 32?

That means 3 keys are required for one plain text to one cipher text?

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i dont know @srestha mam

i thought b is wrong bcoz if i encrypt a msg m1 using k1 then at receivers end it can be decrypted using k2 or k3 as well; which is wrong

i thought c is correct bcoz if i get cipher text 1 , then whatever the msg be, it'll always be decrypted using key 1 only;

similarly if we get cipher text 2 at receiver side , then for any msg m1,m2,m3 ; it can be decrypted using k2 only!!

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@Gate Fever C cannot be the answer because for whatever be the message it (key)its generating same cipher which is wrong

Option A could be right because the cipher might be same in some instances

Option B could also be correct if all the keys are same:P 

As the question 31 says "key that maps two different messages to same cipher text"  options B fits more as the answer for Question 32 rather than Option A.