Let (P, C, K, E, D) be a cryptosystem such that #K = #P = #C. Show that if this cryptosystem has perfect secrecy, then every ciphertext is used with equal probability and every plaintext is used with equal probability.

Q: Decrypt the message ORWWPGDII which was encrypted using the affine cipher: f(p) = (11p + 5) mod 26…

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Q: Determine, if possible, the affine cipher C = aP + b (mod 26) that sends plaintext "BI" to…

A: Introduction:  to determine the affine cipher, we need to use the values corresponding to the…

Q: certain type of door lock has five buttons labelled 1, 2, 3, 4, 5.   It allows the owner to choose a…

A: A certain type of door lock has five buttons labelled 1, 2, 3, 4, 5. Each code is a 4-digit code,…

Q: Use Euclid’s algorithm to find a multiplicative inverse of 19 modulo 45, and hence solve the linear…

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Q: How many different 13-letter words (not necessarily mean- ingful) can be made using the letters in…

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Q: which memory location is assigned by hashing function h(k)=k mod 101 social security number…

A: Which memory locations are assigned by the hashing function h(k) = k mod 101 to the records of…

Q: 4. Suppose you want to add some punctuation to the alphabet and set . = 26, , = 27,! = 28, ? = 29.…

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Q: 7. Encrypt the message MERRY CHRISTMAS PEOPLE using blocks of five letters and the transposition…

A: Understand that we need to encrypt the message "MERRY CHRISTMAS PEOPLE" using the transposition…

Q: 8. How many bit strings(strings of 1 or 0) of length 12 are there such that it contains exactly 4…

A: We need to find the number of bit strings (strings of 1 or 0) of length 12 such that it contains…

Q: 13. Let (n, e) = (16504217646971, 78893) be Alice's public key, where e represents the %3D…

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Q: i just need help with the last two question. im not sure on how to get the first number in the…

A: To encrypt the word "SIS" using the RSA cipher with the given public key (n, e) = (713, 43), we…

Q: |K| key space size for affine cipher over Z135

A: Consider for example For affine cipher e(x) = ax+b (mod m)1<= a,b <=26gcd(a , b) = 1For any…

Q: Determine, if possible, the affine cipher C = aP + b (mod 26) that sends plaintext "BI" to…

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Q: At the imaginary university e/UT there are 101 students in their first year at M&CS. In their first…

A: Given: Double counting Total students=101 To find: k

Q: (7) Which of the following formulas represent the process of encryption in Caesar Cipher? (Choose…

A: Option B M=(C-3)mod26

Q: An Internet service provider requires its customers to select a password consisting of fourletters…

A: An Internet service provider requires its customers to select a password consisting of fourletters…

Q: Suppose a password must be express by selecting digits for 5 places, the allowable digits being 0,…

A: Although, the example of a typical password is 332401, a 6 digit number, the first sentence of the…

Q: An organization wants to assemble a cluster of n computers using wires and hubs. Each must have…

A: Solution of the problem as follows

Q: Recall that an affine cipher, fa,b(n) = an + b( mod 26), where a, b ∈ {0, 1, 2, . . . , 25}, is said…

A: Affine Cipher : The encryption function for a single letter is {\displaystyle E(x)=(ax+b){\bmod…