Exercise 1 (The RSA basics (. Alice forms a public key for the "textbook" RSA public-key encryption and signature schemes, choosing N= 1073 and e = 715. 1. Encrypt the message M = 3 for Alice. 2. What is Alice's private key, and how does she use it for decrypting the received ciphertext? 3. Generate a signature on the message M=1234567 using the following simple hash function H: {0,1}→ Zy such that H(M)= 3M+5 (mod N). 4. Verify that the signature you generated in the previous step is a valid signature.

Exercise 1 (The RSA basics (. Alice forms a public key for the "textbook" RSA public-key encryption and signature schemes, choosing N= 1073 and e = 715. 1. Encrypt the message M = 3 for Alice. 2. What is Alice's private key, and how does she use it for decrypting the received ciphertext? 3. Generate a signature on the message M=1234567 using the following simple hash function H: {0,1}→ Zy such that H(M)= 3M+5 (mod N). 4. Verify that the signature you generated in the previous step is a valid signature.

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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Task One. Implementation of Trapdoor Knapsack En- cryption Scheme In this section, you are to implement a trapdoor knapsack encryption scheme. When the program is run, it first asks for the size of the super-increasing knapsack, then the user is asked to enter the value of each a; in the private key. Then, the user is asked to enter a modulus, follows by a multiplier. You will need to check whether condition of the multipllier is satisfied. Then, the public key will be generated and shown. Now, a set of message is being asked, and the ciphertext will need to be displayed. Finally, a ciphertext will need to be asked and the correct decryption of the ciphertext will need to be displayed. Implement this part as knapsack.cpp or knapsack.java
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language: python so i still have the same question as in the first photo. the answer from the second photo is correct, however i am also not allowed to use string indexing. is there any way i can still do the substitution cipher in the most most most most most basic way?
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