You're reading from Demystifying Cryptography with OpenSSL 3.0 Discover the best techniques to enhance your network security with OpenSSL 3.0

Product type Paperback

Published in Oct 2022

Publisher Packt

ISBN-13 9781800560345

Length 342 pages

Edition 1st Edition

Languages

Tools

Wireshark

Concepts

Cryptography

Author (1):

Alexei Khlebnikov

View More author details

Table of Contents (20) Chapters

Preface

1. Part 1: Introduction

2. Chapter 1: OpenSSL and Other SSL/TLS Libraries FREE CHAPTER

3. Part 2: Symmetric Cryptography

4. Chapter 2: Symmetric Encryption and Decryption

5. Chapter 3: Message Digests

6. Chapter 4: MAC and HMAC

7. Chapter 5: Derivation of an Encryption Key from a Password

8. Part 3: Asymmetric Cryptography and Certificates

9. Chapter 6: Asymmetric Encryption and Decryption

10. Chapter 7: Digital Signatures and Their Verification

11. Chapter 8: X.509 Certificates and PKI

12. Part 4: TLS Connections and Secure Communication

13. Chapter 9: Establishing TLS Connections and Sending Data over Them

14. Chapter 10: Using X.509 Certificates in TLS

15. Chapter 11: Special Usages of TLS

16. Part 5: Running a Mini-CA

17. Chapter 12: Running a Mini-CA

18. Index

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MAC, encryption, and the Cryptographic Doom Principle

When combining a MAC with encryption, one of the following schemes is used:

Encrypt-then-MAC (EtM): Here, the plaintext is encrypted, then the MAC is calculated on the ciphertext and sent together with the ciphertext.
Encrypt-and-MAC (E&M): Here, the plaintext is encrypted, but the MAC is calculated on the plaintext instead of the ciphertext. The ciphertext and the MAC are then sent together.
MAC-then-Encrypt (MtE): Here, the MAC is calculated on the plaintext. Concatenation of the plaintext and the MAC is then encrypted.

On the receiving side, the EtM scheme allows you to check the authenticity of the encrypted message before the decryption operation. The other two schemes require decryption of the whole plaintext before the MAC can be verified.

Security researchers regard EtM as the most secure scheme, provided that a strong and unforgeable MAC function is used. From a security point of view, it makes...