Seth James Nielson - Practical Cryptography in Python: Learning Correct Cryptography by Example
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- Book:Practical Cryptography in Python: Learning Correct Cryptography by Example
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Cryptography is the life blood of the digital worlds security infrastructure. From governments around the world to the average consumer, most communications are protected in some form or another by cryptography. These days, even Google searches are encrypted. Despite its ubiquity, cryptography is easy to misconfigure, misuse, and misunderstand.
Developers building cryptographic operations into their applications are not typically experts in the subject, and may not fully grasp the implication of different algorithms, modes, and other parameters. The concepts in this book are largely taught by example, including incorrect uses of cryptography and how bad cryptography can be broken. By digging into the guts of cryptography, you can experience what works, what doesnt, and why.
What Youll Learn
Understand where cryptography is used, why, and how it gets misused
Know what secure hashing is used for and its basic properties
Get up to speed on algorithms and modes for block ciphers such as AES, and see how bad configurations break
Use message integrity and/or digital signatures to protect messages
Utilize modern symmetric ciphers such as AES-GCM and CHACHA
Practice the basics of public key cryptography, including ECDSA signatures
Discover how RSA encryption can be broken if insecure padding is used
Employ TLS connections for secure communications
Find out how certificates work and modern improvements such as certificate pinning and certificate transparency (CT) logs
Who This Book Is For
IT administrators and software developers familiar with Python. Although readers may have some knowledge of cryptography, the book assumes that the reader is starting from scratch.
Seth James Nielson: author's other books
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Any source code or other supplementary material referenced by the author in this book is available to readers on GitHub via the books product page, located at www.apress.com/9781484248997 . For more detailed information, please visit http://www.apress.com/source-code .
For Saige, who hopes to be a Computer Scientist like Daddy.
Seth
To Mom and Dad, who valued good writing and never settled for less than my best.
Chris
The interconnected world of the current era has drastically changed everything, including banking, entertainment, and even statecraft. Despite differences in users, purposes, and security profiles, these digital applications have at least one thing in common: they all require properly applied cryptography to work correctly.
Informally, cryptography is the mathematics of secrets. We need secret codes to make messages unreadable to unauthorized eyes, to make messages unchangeable, and to know who sent the message. Practical cryptography is the design and use of these codes in real systems.
This book is primarily for computer programmers with little or no previous background with cryptography. Although mathematics makes brief appearances in the book, the overall approach is to teach introductory cryptography concepts by example.
Our journey begins with some introductory components, including hashing algorithms, symmetric encryption, and asymmetric encryption. Next, we go beyond encryption and into the realm of digital certificates, signatures, and message authentication codes. The final chapters show how these various elements come together in interesting and useful combinations, such as Kerberos and TLS.
Another important part of cryptography by example is cryptography by bad example! In this book we will break things on purpose to help the reader appreciate what motivates accepted best practices. Exercises and examples include walk-throughs of real vulnerabilities that have afflicted the Internet. The bad examples will help the reader gain a greater intuition of what goes wrong in cryptography and why.
is the Founder and Chief Scientist of Crimson Vista, Inc., a boutique computer security research and consulting company. He is also an adjunct professor at Johns Hopkins University where he teaches network security and has also served as the Director of Advanced Research Projects in the Information Security Institute. As part of his Hopkins work, he co-founded the https://cryptodoneright.org knowledge base, through a generous grant from Cisco.
has a PhD in machine learning and has spent over a decade at Google in various engineering, machine learning, and leadership roles. He has broad experience writing and teaching programming courses in multiple languages and has worked in document password recovery, malware detection, and large-scale secure computing. He is serving as the Chief Technology Officer at Data Machines Corp. and teaches Cloud Computing Security at the Johns Hopkins University Information Security Institute.
is a Software Security Architect at Entrust Datacard. He holds an undergraduate degree in computer science with concentrations in mathematics and physics and an MSc in computer science in robotics and artificial intelligence. Professionally, his day job is mainly application security architecture and penetration testing, with some research side projects in cryptography and post-quantum cryptography. Outside of work, he mentors teams competing in the high-school-age FIRST Robotics Competition.
Welcome to the world of practical cryptography! The intent of this book is to teach you enough about cryptography that you can reason about what it does, when certain types can be effectively applied, and how to choose good strategies and algorithms. There are examples and exercises throughout each chapter, usually with a follow-along exercise right at the beginning to help you get your bearings. These examples are often accompanied by some fictitious stage setting to add some context. After youve had some exposure and experience, the technical terms that follow those examples should make more sense and be more memorable. We hope you like it.
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