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Demystifying Cryptography with OpenSSL 3.0

You're reading from  Demystifying Cryptography with OpenSSL 3.0

Product type Book
Published in Oct 2022
Publisher Packt
ISBN-13 9781800560345
Pages 342 pages
Edition 1st Edition
Languages
Concepts
Author (1):
Alexei Khlebnikov Alexei Khlebnikov
Profile icon Alexei Khlebnikov
LinkedIn
Alexei Khlebnikov has more than 20 years of professional experience in IT, where he worked in different roles - software developer, system administrator, DevOps engineer, technical leader, architect and project manager. During those years Alexei worked with many technologies - Security, Artificial Intelligence, Web Development, Embedded, Mobile, and Robotics. Among other companies, Alexei worked in Opera Software on the famous Opera Internet browser. Alexei has always been interested in security. He was one of the maintainers of security-related Opera browser modules, responsible for cryptography, SSL/TLS and integration with OpenSSL. He was also a member of the Security Architects group, responsible for the security of the Opera browser. Now Alexei lives in Oslo, Norway, and works as a senior consultant for Bespoke AS. He is also the leader of the Architects group at his current employer.
See other products by Alexei Khlebnikov

Table of Contents (20) Chapters

Preface 1. Part 1: Introduction
2. Chapter 1: OpenSSL and Other SSL/TLS Libraries 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

Using the Online Certificate Status Protocol

In this section, we will learn about OCSP. First, we will learn what it is and how it works. Then, we will learn how to use OCSP on the command line and in C programs.

Understanding the Online Certificate Status Protocol

OCSP is a more modern method of certificate revocation checking that uses much less network traffic than CRL. When using OCSP, you don’t need to download large CRL files. Instead, it is possible to query an OCSP server, also known as an OCSP responder, about the status of a particular certificate. Similar to how CRLs are published by the issuer of a particular certificate, OCSP servers are also maintained by the certificate issuer.

When querying an OCSP responder, an OCSP client sends an ASN.1-encoded OCSP request, containing a list of certificates to check for revocation. The OCSP server responds with an ASN.1-encoded OCSP response, which contains the queried certificate statuses, the validity period of...

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Authors (1)

Profile icon Alexei Khlebnikov
LinkedIn
Alexei Khlebnikov has more than 20 years of professional experience in IT, where he worked in different roles - software developer, system administrator, DevOps engineer, technical leader, architect and project manager. During those years Alexei worked with many technologies - Security, Artificial Intelligence, Web Development, Embedded, Mobile, and Robotics. Among other companies, Alexei worked in Opera Software on the famous Opera Internet browser. Alexei has always been interested in security. He was one of the maintainers of security-related Opera browser modules, responsible for cryptography, SSL/TLS and integration with OpenSSL. He was also a member of the Security Architects group, responsible for the security of the Opera browser. Now Alexei lives in Oslo, Norway, and works as a senior consultant for Bespoke AS. He is also the leader of the Architects group at his current employer.
Read more
See other products by Alexei Khlebnikov

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