Sb=? What is the value of TA What is the value of your shared secret key? Can you guess Bob’s secret value SB and what it would be? Show each step of your calculations, if you use Excel for mod calculation include the spreadsheet, for any other method include the screenshot of that method for mod calculation, the following identity may be useful mod(X*Y,p) = mod mod ( X^n, p) = mod where k+m=n e.g. Bob responds by sending you the value TB = 516. You have secretly picked the value SA = 19 You begin the session by sending Bob your calculated value of TA. You and Bob have agreed to use the public base g = 11 and public modulus p = 733. You have agreed with your friend Bob that you will use the Diffie-Hellman public-key algorithm to exchange secret keys. You receive the cipher text message ZRZH NX STB HFQQJI ZRLH What type of cipher is this? What is the decryption function, and the decrypted/recovered plaintext, (insert spaces to make readable)? Show each and every steps. Without proof you will get partial credit only Q2 Using the English alphabet (i.e., mod 26 arithmetic) let plaintext = Suppose the encryption function is ci = (pi + 5) (mod 26). Which operation will yield? (what is Θ?) input1 Θ result = input 2 input2 Θ result = input 1 Please show proof for one, or disprove other two Hint: Check Input1 OR result = Input2? Input2 OR result = Input1?For results C, D and E, and inputs A and B Repeat replacing OR with AND, and XOR As soon as the given operator is not valid for an operation go to the next operator. Input1 Θ input2 = Result where, input1 and, Inpuut2 arein columns ‘A’ and ‘B’ and Results are in columns C, D, or E from the above table. The number of letters in the alphabet makes them easy to decodeOnce you have the code book you can decode the message instantly Once the shift is determined the message is decoded.What is the basis of the modern cryptography? _A _ requires that the cipher alphabet changes throughout the encryption process.one of the Network threats isHistorically, the major driving force for advances in cryptography has been _Risk is _.The trustworthiness of a system is diminished because of.The _ controls the action of the algorithm.What has become a major web problem with respect to security? Reason: the laws of mathematics manipulation of datacreating disguises for information none of the above Reason: monoalphabetic substitution cipherpolyalphabetic substitution cipherquantum cipheralphanumeric shift cipher Reason: _ buffer overflowslowing the computerdenial of service computer lock up How does it happen: _ protecting business assetsthe need for individual privacywarskeeping diplomatic conversations secret a weakness in the systema circumstance that may cause loss or is possible dangera vulnerability that can be exploited Nothing to worry about Reason: _ exposure to risks high demand for keysdecrease in confidencebad weather Reason: _ The receiver the length of the plain textcipher textkey Reason: scripting errors mapping attackson-line surveysuser ignorance(3 pts) If this message is sent unencrypted and successfully received, what is its entropy? And why?(3 pts) If this message is encrypted with DES using a random 56-bit key, what is the encrypted message’s entropy?And why Reason: _ _ Q1a Complete the following Truth Table: F denotes false and T denotes true A B C=A or B D= A xor B E= A and B F F F T T T T F Q1b In the following Θ denotes one of the following operators: ’or’, ‘xor’ or ‘and’. By protecting against virus, we keep information safe.: True/False justify your answerWhat is not a weakness of a shift cipher? Natural language letter frequency makes them easy to decode. _ Virus constitute all the threats to information. Le sens culturel - Lié au pays, aux religions, à certaines traditions. Tenir le temps d’une ou plusieurs générations avant, de devenir éventuellement Le vert représente la couleur de l’écologie. Le sens sociétal - Ce sont les couleurs de mode qui ont tenu etĬontinuent de représenter certaines valeurs de la société pendant une et il neĬonservera cette valeur que le temps d’une mode. Vert peut être décrété couleur à la mode pour le prochain hiver. Le sens de mode - Ne dure que le temps d’une saison ou deux. On peut classer la signification des couleurs en quatre Les couleurs froides ont la particularité inverse et apportent calme et Particularité d’augmenter le rythme cardiaque et par voie deĬonséquence, élève la température du corps. Perception des couleurs chaudes par notre système nerveux a la La couleur a une grande influence sur notre physiologie. Etes vous déjà passé d’une pièce peinte en bleu à une pièce rouge? SiĬ’est le cas, vous aurez sûrement ressenti une sensation de chaleur
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