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Demystifying Cryptography with OpenSSL 3.0

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

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Product type Paperback
Published in Oct 2022
Publisher Packt
ISBN-13 9781800560345
Length 342 pages
Edition 1st Edition
Languages
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Author (1):
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Alexei Khlebnikov Alexei Khlebnikov
Author Profile Icon Alexei Khlebnikov
Alexei Khlebnikov
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Table of Contents (20) Chapters Close

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 19. Other Books You May Enjoy

Understanding OpenSSL BIOs

To establish TLS connections and send data over them, we will use OpenSSL Basic Input/Output (BIO) objects. BIOs provide the same Application Programming Interface (API) for working with different types of Input/Output (I/O) channels, such as files, sockets, and TLS streams.

BIOs are divided into two types: source or sink BIOs and filter BIOs. A source or sink BIO represents an I/O endpoint, such as a file or a socket. A filter BIO transforms data that is being passed through the BIO. For example, a cipher BIO encrypts data when being written to and decrypts data when being read from. BIOs can be connected and form a chain of BIOs. For example, an SSL BIO can be connected to a socket BIO, providing TLS communication on a socket.

OpenSSL supports the following source or sink BIOs:

  • Accept BIO (BIO_s_accept): TCP/IP socket or Unix socket accept routines.
  • BIO BIO (BIO_s_bio): A BIO pair where whatever is written to one half of the pair can be...
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