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Crypto101 Introductory Course for Programmers

This isn't something I normally highlight, but when I saw this mentioned on I Programmer, Crypto 101 - A Free Ebook, and looked into it a little, I know I had today's post...


Crypto 101 is an introductory course on cryptography, freely available for programmers of all ages and skill levels.

Start to finish.

Comes with everything you need to understand complete systems such as SSL/TLS: block ciphers, stream ciphers, hash functions, message authentication codes, public key encryption, key agreement protocols, and signature algorithms.

Learn by doing.

Learn how to exploit common cryptographic flaws, armed with nothing but a little time and your favorite programming language.

Forge administrator cookies, recover passwords, and even backdoor your own random number generator.

Works everywhere.

DRM-free and available in all common formats:

  • PDF (for Mac and PC)

Exercises run on OS X, Windows, Linux and BSDs.


From the PDF's, About this book

This book is intended as an introduction to cryptography for programmers of any skill level. It’s a continuation of a talk of the same name, which was given by the author at PyCon 2013.

The structure of this book is very similar: it starts with very simple primitives, and gradually introduces new ones, demonstrating why they’re necessary. Eventually, all of this is put together into complete, practical cryptosystems, such as TLS, GPG and OTR.

The goal of this book is not to make anyone a cryptographer or a security researcher. The goal of this book is to understand how complete cryptosystems work from a bird’s eye view, and how to apply them in real software.

The exercises accompanying this book focus on teaching cryptography by breaking inferior systems. That way, you won’t just ”know” that some particular thing is broken; you’ll know exactly how it’s broken, and that you, yourself, armed with little more than some spare time and your favorite programming language, can break them. By seeing how these ostensibly secure systems are actually completely broken, you will understand why all these primitives and constructions are necessary for complete cryptosystems. Hopefully, these exercises will also leave you with healthy distrust of DIY cryptography in all its forms.

For a long time, cryptography has been deemed the exclusive realm of experts. From the many internal leaks we’ve seen over the years of the internals of both large and small corporations alike, it has become obvious that that approach is doing more harm than good. We can no longer afford to keep the two worlds strictly separate. We must join them into one world where all programmers are educated in the basic underpinnings of information security, so that they can work together with information security professionals to produce more secure software systems for everyone. That does not make people such as penetration testers and security researchers obsolete or less valuable; quite the opposite, in fact. By sensitizing all programmers to security concerns, the need for professional security audits will become more apparent, not less.

This book hopes to be a bridge: to teach everyday programmers from any field or specialization to understand just enough ...

Now click through and read it, https://www.crypto101.io/


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  • carlcarl

    I tried to download it but the link does not seem to be working. Any other links to get the book?


  • Greg Duncangduncan411 It's amazing what a professional photographer can do...

    @carl: I just tested it and was able to download the PDF just fine... Maybe it was just a hiccup. 

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