Book Image

TLS Cryptography In-Depth

By : Dr. Paul Duplys, Dr. Roland Schmitz
Book Image

TLS Cryptography In-Depth

By: Dr. Paul Duplys, Dr. Roland Schmitz

Overview of this book

TLS is the most widely used cryptographic protocol today, enabling e-commerce, online banking, and secure online communication. Written by Dr. Paul Duplys, Security, Privacy & Safety Research Lead at Bosch, and Dr. Roland Schmitz, Internet Security Professor at Stuttgart Media University, this book will help you gain a deep understanding of how and why TLS works, how past attacks on TLS were possible, and how vulnerabilities that enabled them were addressed in the latest TLS version 1.3. By exploring the inner workings of TLS, you’ll be able to configure it and use it more securely. Starting with the basic concepts, you’ll be led step by step through the world of modern cryptography, guided by the TLS protocol. As you advance, you’ll be learning about the necessary mathematical concepts from scratch. Topics such as public-key cryptography based on elliptic curves will be explained with a view on real-world applications in TLS. With easy-to-understand concepts, you’ll find out how secret keys are generated and exchanged in TLS, and how they are used to creating a secure channel between a client and a server. By the end of this book, you’ll have the knowledge to configure TLS servers securely. Moreover, you’ll have gained a deep knowledge of the cryptographic primitives that make up TLS.
Table of Contents (30 chapters)
1
Part I Getting Started
8
Part II Shaking Hands
16
Part III Off the Record
22
Part IV Bleeding Hearts and Biting Poodles
27
Bibliography
28
Index

22

Attacks on TLS Implementations

In the previous chapter, we discussed attacks on the TLS Record protocol. Among other things, we learned how timing side channels can be used to create padding oracles, how predictable initialization vectors can be exploited to attack the CBC mode of operation, and how lossless data compression can compromise the security of an encryption scheme even if the scheme itself is cryptographically secure.

In this chapter, we will take a detailed look at attacks exploiting bugs in TLS software implementations. Among other things, we will cover the following topics:

  • Security vulnerabilities resulting from implementing complex specifications

  • Security implications of Alice and Bob having a different view of the cryptographic protocol they are executing

  • Attacks that exploit so-called taint-style vulnerabilities – processing input data without checking that it was not manipulated by Mallory

  • Implications of implementation bugs in random number generators

  • Security...