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Cryptography Algorithms

You're reading from   Cryptography Algorithms A guide to algorithms in blockchain, quantum cryptography, zero-knowledge protocols, and homomorphic encryption

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Product type Paperback
Published in Mar 2022
Publisher Packt
ISBN-13 9781789617139
Length 358 pages
Edition 1st Edition
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Author (1):
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Massimo Bertaccini Massimo Bertaccini
Author Profile Icon Massimo Bertaccini
Massimo Bertaccini
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Toc

Table of Contents (15) Chapters Close

Preface 1. Section 1: A Brief History and Outline of Cryptography
2. Chapter 1: Deep Diving into Cryptography FREE CHAPTER 3. Section 2: Classical Cryptography (Symmetric and Asymmetric Encryption)
4. Chapter 2: Introduction to Symmetric Encryption 5. Chapter 3: Asymmetric Encryption 6. Chapter 4: Introducing Hash Functions and Digital Signatures 7. Section 3: New Cryptography Algorithms and Protocols
8. Chapter 5: Introduction to Zero-Knowledge Protocols 9. Chapter 6: New Algorithms in Public/Private Key Cryptography 10. Chapter 7: Elliptic Curves 11. Chapter 8: Quantum Cryptography 12. Section 4: Homomorphic Encryption and the Crypto Search Engine
13. Chapter 9: Crypto Search Engine 14. Other Books You May Enjoy

Digital signatures on MBXI

Returning to MBXI, we notice that [x], the reformulated encryption key, is able to perform the encryption:

C ≡ Mx (mod p) 

[x] results in the inverse of [y], the decryption key, in the following function:

C^y ≡ M (mod p)

In mathematical language, the encryption equation is as follows:

{[Ka^b+eB] (mod p) * x ≡ 1 (mod p-1)

This results in the inverse of the decryption equation, [y]:

y ≡ {[Kb^a+eB] (mod p)}

Let's perform a test with numbers to understand it better:

  • x = 3009
  • y = 4955

If we input x = 3009 in the inverse function (mod p-1), we can find the result [y] using Mathematica:

Reduce [3009*x == 1, y, Modulus -> p - 1]
y == 4955

That means, if Bob sends a message using MBXI, he will share a [secret key] type with Alice.

Another problem arises: how is it possible to avoid a MiM attack in a symmetric algorithm?

As you can see, MBXI has more characteristics of an asymmetric...

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