Cryptography Elgonel public key copborystemandyou hove the comuponding ciphentent yys)The ownen of the private keywoas usedtoailinggouisdeceypt exachly one ciphentext g.y,') thatchoose ond send to him, ascanlongas y,'t y -How can you find x?

Answered: Egomel public key cnptosystem was uscd…

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

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Cryptography
Bob sent Alioe an encrypted messago. The message consists of 3 words, In each word, Bob encoded the letters as fulows A01,6 02.C0. Z-26 The he wrote the oodes next to aach other to form a number that represent the word. For example, the word "WEsntoded as 206 since it consists of 2 lettors W-23 and E-05. After encoding. Bob encrypled each encoded word with RSA using Alice puble keylpa, e) where pe100000007, qe10000019, e11. Alce oved the following 3 encrypted words from Bot 451095483713115 570203572152011 958260071840609 She used here RSA private key (d) to decrypt the message The first word of the message that Bob sent was WE. Q1. What is the private key d? (enter you answer as an exact number) 230760000000025 Q2. What is the second word of the message that Bob sent to Alice? (enter you answer as one word) LIKE 03. What is the third word of the message that Bob sent to Alice? (enter you answer as one word) MATH
Question # 3 Assume that Dominique and Pricilla agreed to use an auto key cipher with initial keyvalue k1 = 11. Now Dominique wants to send Pricilla the following message“THE CLASS IS CANCELLED”. Encrypt the message before transmitting it over the Internet Remember: i need a Mathematics solution not computer program You must show all the steps of your work
Using public key cryptography, X adds a digital signature s to message M, encrypts <M, s>, and sends it to Y, where it is decrypted. Which one of the following sequences of keys is used for the operations? A) Encryption: X's private key followed by Y's private key; Decryption: X's public key followed by Y's public key B) Encryption: X's private key followed by Y's public key; Decryption: X's public key followed by Y's private key C) Encryption: X's public key followed by Y's private key; Decryption: Y's public key followed by X's private key D) Encryption: X's private key followed by Y's public key; Decryption: Y's private key followed by X's public key
Alice sets up an RSA public/private key, but instead of using two primes, she chooses three primes p, q, and r and she uses n=pqr as her RSA-style modulus. She chooses an encryption exponent e and calculates a decryption exponent d. Encryption and Decryption are defined: C ≡ me mod n and m ≡ Cd mod n where C is the ciphertext corresponding to the message m. Decryption: de ≡ 1 mod φ(n) | Let p = 5, q = 7, r = 3, e = 11, and the decryption exponent d = -13. n = 105 & φ(n) = 48 Q: Alice upgrades to three primes that are each 200 digits long. How many digits does n have?
Problem 3. Two texts were encrypted with a Vigenère cipher, both using the same key. The ciphertexts are We found out that the first message begins with HELLOBOB, and ends with ALICE, but we don't know what is in between. ALLYY TUJRM ZKXAT BXAMP OIGKE LVRXS ZBCMH YNHLC VSIMV TVIX AHVRK FOKZJ EKTR Decrypt the second message.
I need the answer as soon as possible
Public Key Authority is one example of this. Before sending a message to A, the Public Key Authority must prepare a request for B's public key (E(PRauth[PUB] || Request || Time1]). It's debatable whether letter in the alphabet A should be used to understand the message.
Cryptography
On Groundhog Day, the groundhog randomly chooses and sends one of two possible messages: m0 = SIXMOREWEEKSOFWINTER m1 = SPRINGARRIVESINMARCH. To add to the mystery, the groundhog encrypts the message using one of the following methods: shift cipher, Vigenère cipher with key length 4 (using four distinct shifts), one-time pad. For each of the following ciphertexts, determine which encryption methods could have produced that ciphertext, and for each of these possible encryption methods, decrypt the message or explain why it is impossible to decrypt. a. ABCDEFGHIJKLMNOPQRST b. UKZOQTGYGGMUQHYKPVGT c. UQUMPHDVTJYIUJQQCSFL.
Let's assume that Bob and Alice share a secret key in a symmetric key system. Bob wishes tobegin a conversation with Alice, and sends her a message that essentially says "let's talk". Aliceis suspicious that the person contacting her might not be Bob, so Alice generates a single-userandom number (a nonce) and sends it to Bob. Bob encrypts the nonce with the secret key heshares with Alice and sends it back. Alice decrypts this message and retrieves the same nonceshe sent to Bob. Which of the following is true, provided the secret key K has not been compromised?
Help me please

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Egomel public key cnptosystem was uscd x, and you hare the The owner of the private ky decrypt exactly one ciphentert y.y.') that choose ond send to him, as COMreponding ciphentext ly.y. wiling gou is to can long How can you find x ?