1. Please apply columnar transposition cipher to encrypt the message "a digital computer is a machine that can solve problems for" ignoring the space in between. If the probable word is “network", please give the corresponding ciphertext (no spaces). State the result: Provide Proof:| Solution: Proof is as the following, |N (3) E(1) T(6) W(7) O(4) R(5) K(2)

1. Please apply columnar transposition cipher to encrypt the message "a digital computer is a machine that can solve problems for" ignoring the space in between. If the probable word is “network", please give the corresponding ciphertext (no spaces). State the result: Provide Proof:| Solution: Proof is as the following, |N (3) E(1) T(6) W(7) O(4) R(5) K(2)

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

See similar textbooks

Similar questions

A.Given p=25, q=9, and e=7, generate the public key (n,e) and the private key (n,d) using the RSA Key generation algorithm. (Use Excel for computations) b. Given Bob's public key of (85, 7) and private key of (85, 55), show how Alice can encrypt m=3 to send to Bob. Show the ciphertext. c. Given Bob's public key of (85, 7) and private key of (85, 55), show how Bob can decrypt the ciphertext y=2 received from Alice. Show the plaintext. d. Using the fast exponentiation method, determine 530 mod 47. Show your work.
7
What will be the ciphered text corresponding to “ALGORITHM” if bifid cipher is used for encryption with key as “KEY” with a period as 5? a) SBPISZTKZH b) PLNSOWGKQM c) SELFQEXBHM d) YFSGWNFBW
Many forms of cryptography are based on the following discrete log problem. Choose a cyclic group G (produced by one generator g) with finitely many elements. Alice and Bob want to set up a secret communication and need a secret key for that, which becomes a group element from G. They set up the following exchange (the so-called Diffie-Hellman protocol): 1. Alice chooses a secret group element a and sends unsecured g^a to Bob 2.Bob chooses a secret group element b and sends unsecured g^b to Alice 3. Alice calculates (g^b )^a and keeps this group element secret 4.Bob calculates (g^a )^b and keeps this group element secret Since a cyclic group is abelian, Alice and Bob now share the secret key (g^b )^a=(g^a )^b. The blue group elements are publicly known, the red elements are secret. The discrete log problem presented to an eavesdropper is computing say a from the publicly known data G,g,g^a. The naming of the problem comes from the solution a= glog⁡(ga ) which is generally difficult to…
. Consider the alphabet Σ = {0,1}. Give regular expressions generating the following lan- guages. (a) {w ¤ Σ* | w begins with a 0 and ends with a 1} (b) {w € Σ* | w contains at least four Os} 1* (c) {w € Σ* | w contains the substring 1101} (d) {w € Σ* | w has length at least 4 and its third symbol is a 0} (e) {w € Σ* | w begins with a 0 and has even length, or begins with a 1 and has odd length} (f) {€,0} (g) The empty set (h) All strings over Σ (i) All strings over Σ except the empty string
Consider a very simple symmetric block encryption algorithm in which 32-bits blocks of plaintext are encrypted using a 64-bit key. Encryption is defined as C = (PK₁) K₁ where C = ciphertext, K = secret key, Ko = leftmost 64 bits of K, K₁ = rightmost 64 bits of K,+ = bitwise exclusive OR, and is addition mod 264. a. Show the decryption equation. That is, show the equation for P as a function of C, Ko, and K₁. b. Suppose and adversary has access to two sets of plaintexts and their correspond- ing ciphertexts and wishes to determine K. We have the two equations: C = (PK) K₁; C = (PK) K₁ First, derive an equation in one unknown (e.g., Ko). Is it possible to proceed fur- ther to solve for Ko?
A.Given p=25, q=9, and e=7, generate the public key (n,e) and the private key (n,d) using the RSA Key generation algorithm. (Use Excel for computations) b. Given Bob's public key of (85, 7) and private key of (85, 55), show how Alice can encrypt m=3 to send to Bob. Show the ciphertext. c. Given Bob's public key of (85, 7) and private key of (85, 55), show how Bob can decrypt the ciphertext y=2 received from Alice. Show the plaintext. d. Using the fast exponentiation method, determine 530 mod 47. Show your work.
dont post copied or existing one skip skip if dont know
I need help with this question
Can someone help me understand this problem from my textbook?
Describe the differences between a monoalphabetic cipher and a polyalphabetic cipher. Is the Caesar cipher a polyalphabetic cipher? In one of his cases, Sherlock Holmes was confronted with the following message: Znk yozagzout oy mxgbk. Iusk osskjogzkre Although Watson was puzzled, Holmes was immediately able to deduce the type of cipher. Describe the cipher being used to encrypt this message. Can you decode the message? Is this cipher susceptible to brute-force cryptanalysis?
2.(a) Consider the use of OTP. Let m be an arbitrary message to be encrypted and c be a given ciphertext in the ciphertext space. How many possible keys with which m can be mapped to c, i.e., f(m,k)=c? None 1 2 The size of the key space Depends on m (b) 3^(-n) is negligible. True or false? (c) n^(-100) is negligible. True or false?