2. We conduct a known-plaintext attack on an LFSR-based stream cipher. We know that theplaintext sent was:1001001001101101100100100110By tapping the channel carrying the cipher text, we observe the following stream:1011110000110001001010110001(a) What is the length m of the key stream generator (assume the length is no more than 6and you can use any tool to compute the determinant. But you must display the matricesused)?(b) What is the initialization vector?(c) Determine the feedback coefficients of the LFSR.

a) Key stream is determined by the XOR of the plain text and cipher text.

Answered: 2. We conduct a known-plaintext attack…

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

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Similar questions

Find the inverse of 17 modulo 97 9 iec t2 'N Decrypt the following message using shift cipher: f(p) = (p+ 10) mod 26 ' LO WI PBSOXN"
please make any possible answer
Let A=0, Z=25
Recall that an affine cipher, fa,b(n) = an + b( mod 26), where a, b ∈ {0, 1, 2, . . . , 25}, is said to be valid if gcd(a, 26) = 1. (a)Use the key (a, b) = (3, 0) to come up with the cipher text corresponding to the following plaintext DO WELL. (b) Now use the key (a, b) = (5, 1) to come up with the cipher text for DO WELL. (c) The key (a, b) = (5, 1) was used to generate the following cipher text. Decrypt the message. gbidxv vbfev
Use the RSA cipher with public key n = 713 = 23 · 31 and e = 43. Decrypt the given ciphertext and find the original message. (Assume the letters of the alphabet are encoded as follows: A = 01, B = 02, C = 03, ..., Z = 26.) Decrypt: 476 089 048 129
1.3. For this exercise, use the simple substitution table given in Table 1.11. (a) Encrypt the plaintext message The gold is hidden in the garden. (b) Make a decryption table, that is, make a table in which the ciphertext alphabet is in order from A to Z and the plaintext alphabet is mixed up. (c) Use your decryption table from (b) to decrypt the following message. IBXLX JVXIZ SLLDE VAQLL DEVAU QLB
Determine, if possible, the affine cipher C = aP + b (mod 26) that sends plaintext "OK" to ciphertext "HI."
Apply the affine cipher formula C=(5P + 2) mod 26 to encript "LASER PRINTER". JGNSA DUNTXNA JSNAS DNUTXAN JGSAN DNUTXAN JGSAN DUNXANT
Decrypt the message CFEJFE which was encrypted using the affine cipher: Alphabet: A = 0, B = 1,..., Z = 25 Message: f(p) = (15p+5) mod 26
a. Given p=23, q=7, and e=5, generate the public key (n,e) and the private key (n,d) using RSA Key generation algorithm. b. Given Bob's public key of (85, 7) and private key of (85, 55), show how Alice can encrypt m=7 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=8 received from Alice. Show the plaintext. d. Using the fast exponentiation method (page 182), determine 535 mod 47

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