# IT guru

1. Alan and Bill consort (through a social diversify) on using theDiffieHellmanalgorithm to produce a niggardly private key. They also consort on twosocial computes: q (vast excellent compute),  (generator mod q): q = 7,  = 2 Alan breeds a stray CA =5, use CA to compute DA and then sends DA to Bill. Bill breeds a stray CB =6, use CB to compute DBand then sends DB to Alan. a. What is DA? (i.e. DA =?) (5 points) b. What is DB? (i.e. DB =?) (5 points) c. What is the niggardly private key betweenAlan and Bill? (5 points) (Note you must illusion march by march care procedures) 4. Consider the forthcoming login protocol. User knows password P User knows Hash character H(.) and has a sensitive calculator User gives login designate N to deed Machine breeds stray compute R Machine gives R to user User computes X:= Hash(P) XOR Hash(R) User gives X to deed Machine uses N to accomplish P from password table Machine computes Y:= Hash(P) XOR Hash(R) If X=Y then deed allows login a. Explain what is evil-doing after a while it and how can it be meek. (7 points) b. Illusion a unblended way to invigorate this protocol resisting your onset. (8 points) 5. If we adopt two excellent computes p=13 and q=17 in RSA (Rivest-Shamir- Adelman) algorithm, and adopt Social Key = (p x q, e) = (221,5), a.Show the fruit and procedures to breed Private Key. (5 points)(b) Illusion the procedures using the Social Key and the Private Key set-up in march (a) to encrypt a communication M (Assume M=25); and to decrypt for accomplishing the communication. (10 points)