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TLS Cryptography In-Depth

You're reading from  TLS Cryptography In-Depth

Product type Book
Published in Jan 2024
Publisher Packt
ISBN-13 9781804611951
Pages 712 pages
Edition 1st Edition
Languages
Concepts
Authors (2):
Dr. Paul Duplys Dr. Paul Duplys
Profile icon Dr. Paul Duplys
LinkedIn
Dr. Paul Duplys is chief expert for cybersecurity at the department for technical strategies and enabling within the Mobility sector of Robert Bosch GmbH, a Tier-1 automotive supplier and manufacturer of industrial, residential, and consumer goods. Previous to this position, he spent over 12 years with Bosch Corporate Research, where he led the security and privacy research program and conducted applied research in various fields of information security. Paul's research interests include security automation, software security, security economics, software engineering, and AI. Paul holds a PhD degree in computer science from the University of Tuebingen, Germany.
See other products by Dr. Paul Duplys
Dr. Roland Schmitz Dr. Roland Schmitz
Profile icon Dr. Roland Schmitz
LinkedIn
Dr. Roland Schmitz has been a professor of internet security at the Stuttgart Media University (HdM) since 2001. Prior to joining HdM, from 1995 to 2001, he worked as a research engineer at Deutsche Telekom, with a focus on mobile security and digital signature standardization. At HdM, Roland teaches courses on internet security, system security, security engineering, digital rights management, theoretical computer science, discrete mathematics, and game physics. He has published numerous scientific papers in the fields of internet and multimedia security. Moreover, he has authored and co-authored several books. Roland holds a PhD degree in mathematics from Technical University Braunschweig, Germany.
See other products by Dr. Roland Schmitz
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Table of Contents (30) Chapters

Preface 1. Part I Getting Started
2. Chapter 1: The Role of Cryptography in the Connected World 3. Chapter 2: Secure Channel and the CIA Triad 4. Chapter 3: A Secret to Share 5. Chapter 4: Encryption and Decryption 6. Chapter 5: Entity Authentication 7. Chapter 6: Transport Layer Security at a Glance 8. Part II Shaking Hands
9. Chapter 7: Public-Key Cryptography 10. Chapter 8: Elliptic Curves 11. Chapter 9: Digital Signatures 12. Chapter 10: Digital Certificates and Certification Authorities 13. Chapter 11: Hash Functions and Message Authentication Codes 14. Chapter 12: Secrets and Keys in TLS 1.3 15. Chapter 13: TLS Handshake Protocol Revisited 16. Part III Off the Record
17. Chapter 14: Block Ciphers and Their Modes of Operation 18. Chapter 15: Authenticated Encryption 19. Chapter 16: The Galois Counter Mode 20. Chapter 17: TLS Record Protocol Revisited 21. Chapter 18: TLS Cipher Suites 22. Part IV Bleeding Hearts and Biting Poodles
23. Chapter 19: Attacks on Cryptography 24. Chapter 20: Attacks on the TLS Handshake Protocol 25. Chapter 21: Attacks on the TLS Record Protocol 26. Chapter 22: Attacks on TLS Implementations 27. Bibliography
28. Index
29. Other Books You Might Enjoy

20.4 Padding oracle attacks on TLS handshake

The term oracle originally comes from complexity theory, where it is used to compare the complexity of two computational problems P1,P2.

Suppose we can solve P1 efficiently (i.e., in polynomial time), if there is a polynomial-time algorithm A to solve P2. In this situation, we say that P1 polytime reduces to P2, or

P ≤ P 1 p 2

Informally, we can say that P2 is at least as hard as P1 ([117]). Now, the (hypothetical) algorithm A that can efficiently solve P2 is called an oracle for P2.

As an example, let P1 be the RSA-problem and P2 be the integer factorization problem. Recall from Chapter 7, Public-Key Cryptography, that the RSA problem means we have to find the plaintext m, given the ciphertext

c = me mod n

and the public key (e,n), while the integer factorization problems is to find the prime factors of a given integer.

Now it is easy to see that if we had an oracle that provides us with the prime factors of n in polynomial time, we could also solve the...

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Authors (2)

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Profile icon Dr. Paul Duplys
LinkedIn
Dr. Paul Duplys is chief expert for cybersecurity at the department for technical strategies and enabling within the Mobility sector of Robert Bosch GmbH, a Tier-1 automotive supplier and manufacturer of industrial, residential, and consumer goods. Previous to this position, he spent over 12 years with Bosch Corporate Research, where he led the security and privacy research program and conducted applied research in various fields of information security. Paul's research interests include security automation, software security, security economics, software engineering, and AI. Paul holds a PhD degree in computer science from the University of Tuebingen, Germany.
Read more
See other products by Dr. Paul Duplys
Profile icon Dr. Roland Schmitz
LinkedIn
Dr. Roland Schmitz has been a professor of internet security at the Stuttgart Media University (HdM) since 2001. Prior to joining HdM, from 1995 to 2001, he worked as a research engineer at Deutsche Telekom, with a focus on mobile security and digital signature standardization. At HdM, Roland teaches courses on internet security, system security, security engineering, digital rights management, theoretical computer science, discrete mathematics, and game physics. He has published numerous scientific papers in the fields of internet and multimedia security. Moreover, he has authored and co-authored several books. Roland holds a PhD degree in mathematics from Technical University Braunschweig, Germany.
Read more
See other products by Dr. Roland Schmitz
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