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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

Analysis attack and technical issues

When we first described this algorithm, the assumption was that Eve has the same computational power as Bob and Alice and can spy on the conversations between them.

So, if Eve has a quantum computer in her hands and all the instruments to detect the photons' polarization, could she break the algorithm?

Let's see what Eve can do with her incommensurable computational power and the possibility of eavesdropping on the classical and quantum channels.

It looks like she is in the same situation as Bob (receiving photons). When Alice transmits the photons to Bob, even if the transmission comes through a quantum channel, if someone can capture the entire sequence of bits before Bob's selection, it's supposed that they will be able to collect the bits of the key. This could be true if Eve gets 100% of the measurements correct, but that is unthinkable for a key with a 1,000-bit length or more. Moreover, the attack will be discovered...

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