---
visibility: public
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# Application Security

**repo:** [paragonie/awesome-appsec](https://github.com/paragonie/awesome-appsec)  
**category:** [[security|Security]]
**related:** [[ctf|CTF]] · [[hacking|Hacking]] · [[malware-analysis|Malware Analysis]]

---

# Awesome AppSec [![Awesome](https://cdn.rawgit.com/sindresorhus/awesome/d7305f38d29fed78fa85652e3a63e154dd8e8829/media/badge.svg)](https://github.com/sindresorhus/awesome)

A curated list of resources for learning about application security. Contains books,
websites, blog posts, and self-assessment quizzes.

Maintained by [Paragon Initiative Enterprises](https://paragonie.com) with
contributions from the application security and developer communities. We also
have [other community projects](https://paragonie.com/projects) which might be
useful for tomorrow's application security experts.

If you are an absolute beginner to the topic of software security, you may benefit
from reading [A Gentle Introduction to Application Security](https://paragonie.com/blog/2015/08/gentle-introduction-application-security).

# Contributing

[Please refer to the contributing guide for details](CONTRIBUTING.md).

# Application Security Learning Resources

  * [General](#general)
    * [Articles](#articles)
      * [How to Safely Generate a Random Number](#how-to-safely-generate-a-random-number-2014) (2014)
      * [Salted Password Hashing - Doing it Right](#salted-password-hashing-doing-it-right-2014) (2014)
      * [A good idea with bad usage: /dev/urandom](#a-good-idea-with-bad-usage-devurandom-2014) (2014)
      * [Why Invest in Application [Security](/@harrisonqian/awesome/wiki/security/security)?](#why-invest-in-application-security-2015) (2015)
      * [Be wary of one-time pads and other crypto unicorns](#be-wary-of-one-time-pads-and-other-crypto-unicorns-2015) (2015)
    * [Books](#books)
      * [Web Application Hacker's Handbook](#-web-application-hackers-handbook-2011) (2011) ![nonfree](img/nonfree.png)
      * [Cryptography Engineering](#-[cryptography](/@harrisonqian/awesome/wiki/computer-science/cryptography)-engineering-2010) (2010) ![nonfree](img/nonfree.png)
      * [Securing DevOps](#-securing-devops-2018) (2018) ![nonfree](img/nonfree.png)
      * [Gray Hat [Python](/@harrisonqian/awesome/wiki/programming-languages/python): Programming for Hackers and Reverse Engineers](#-gray-hat-python-programming-for-hackers-and-reverse-engineers-2009) (2009) ![nonfree](img/nonfree.png)
      * [The Art of Software [Security](/@harrisonqian/awesome/wiki/security/security) Assessment: Identifying and Preventing Software Vulnerabilities](#-the-art-of-software-security-assessment-identifying-and-preventing-software-vulnerabilities-2006) (2006) ![nonfree](img/nonfree.png)
      * [C Interfaces and Implementations: Techniques for Creating Reusable Software](#-c-interfaces-and-implementations-techniques-for-creating-reusable-software-1996) (1996) ![nonfree](img/nonfree.png)
      * [Reversing: Secrets of Reverse Engineering](#-reversing-secrets-of-reverse-engineering-2005) (2005) ![nonfree](img/nonfree.png)
      * [JavaScript: The Good parts](#-[javascript](/@harrisonqian/awesome/wiki/programming-languages/javascript)-the-good-parts-2008) (2008) ![nonfree](img/nonfree.png)
      * [Windows Internals: Including [Windows](/@harrisonqian/awesome/wiki/platforms/windows) Server 2008 and Windows Vista, Fifth Edition ](#-windows-internals-including-windows-server-2008-and-windows-vista-fifth-edition-2007) (2007) ![nonfree](img/nonfree.png)
      * [The Mac Hacker's Handbook](#-the-mac-hackers-handbook-2009) (2009) ![nonfree](img/nonfree.png)
      * [The IDA Pro Book: The Unofficial Guide to the World's Most Popular Disassembler](#-the-ida-pro-book-the-unofficial-guide-to-the-worlds-most-popular-disassembler-2008) (2008) ![nonfree](img/nonfree.png)
      * [Internetworking with TCP/IP Vol. II: ANSI C Version: Design, Implementation, and Internals (3rd Edition)](#-internetworking-with-tcpip-vol-ii-ansi-c-version-design-implementation-and-internals-3rd-edition-1998) (1998) ![nonfree](img/nonfree.png)
      * [Network Algorithmics,: An Interdisciplinary Approach to Designing Fast Networked Devices](#-network-algorithmics-an-interdisciplinary-approach-to-designing-fast-networked-devices-2004) (2004) ![nonfree](img/nonfree.png)
      * [Computation Structures (MIT Electrical Engineering and Computer Science)](#-computation-structures-mit-electrical-engineering-and-computer-science-1989) (1989) ![nonfree](img/nonfree.png)
      * [Surreptitious Software: Obfuscation, Watermarking, and Tamperproofing for Software Protection](#-surreptitious-software-obfuscation-watermarking-and-tamperproofing-for-software-protection-2009) (2009) ![nonfree](img/nonfree.png)
      * [Secure Programming HOWTO](#secure-programming-howto-2015) (2015)
      * [Security Engineering - Third Edition](#[security](/@harrisonqian/awesome/wiki/security/security)-engineering-third-edition-2020) (2020)
      * [Bulletproof SSL and TLS](#-bulletproof-ssl-and-tls-2014) (2014) ![nonfree](img/nonfree.png)
      * [Holistic Info-Sec for Web Developers (Fascicle 0)](#holistic-info-sec-for-web-developers-fascicle-0-2016) (2016)
      * [Holistic Info-Sec for Web Developers (Fascicle 1)](#holistic-info-sec-for-web-developers-fascicle-1)
    * [Classes](#classes)
      * [Offensive Computer [Security](/@harrisonqian/awesome/wiki/security/security) (CIS 4930) FSU](#offensive-computer-security-cis-4930-fsu)
      * [Hack Night](#hack-night)
    * [Websites](#websites)
      * [Hack This Site!](#hack-this-site)
      * [Enigma Group](#enigma-group)
      * [Web App Sec Quiz](#web-app-sec-quiz)
      * [SecurePasswords.info](#securepasswords-info)
      * [Security News Feeds Cheat-Sheet](#[security](/@harrisonqian/awesome/wiki/security/security)-news-feeds-cheat-sheet)
      * [Open [Security](/@harrisonqian/awesome/wiki/security/security) Training](#open-security-training)
      * [MicroCorruption](#microcorruption)
      * [The Matasano Crypto Challenges](#the-matasano-crypto-challenges)
      * [PentesterLab](#pentesterlab)
      * [Juice Shop](#juice-shop)
      * [Supercar Showdown](#supercar-showdown)
      * [OWASP NodeGoat](#owasp-nodegoat)
      * [Securing The Stack](#securing-the-stack)
      * [OWASP ServerlessGoat](#owasp-serverlessgoat)
      * [SecDim](#secdim)
      * [Blogs](#blogs)
        * [Crypto Fails](#crypto-fails)
        * [NCC Group - Blog](#ncc-group-blog)
        * [Scott Helme](#scott-helme)
        * [Cossack Labs blog](#cossack-labs-blog-2018) (2018)
      * [Wiki pages](#wiki-pages)
        * [OWASP Top Ten Project](#owasp-top-ten-project)
      * [Tools](#tools)
        * [Qualys SSL Labs](#qualys-ssl-labs)
        * [securityheaders.io](#securityheaders-io)
        * [report-uri.io](#report-uri-io)
        * [clickjacker.io](#clickjacker-io)
  * [AWS Lambda](#aws-lambda)
    * [Tools](#tools-1)
      * [PureSec FunctionShield](#puresec-functionshield)
  * [Android](#android)
    * [Books and ebooks](#books-and-ebooks)
      * [SEI CERT [Android](/@harrisonqian/awesome/wiki/platforms/android) Secure Coding Standard](#sei-cert-android-secure-coding-standard-2015) (2015)
  * [C](#c)
    * [Books and ebooks](#books-and-ebooks-1)
      * [SEI CERT C Coding Standard](#sei-cert-c-coding-standard-2006) (2006)
      * [Defensive Coding: A Guide to Improving Software [Security](/@harrisonqian/awesome/wiki/security/security) by the Fedora Security Team](#defensive-coding-a-guide-to-improving-software-security-by-the-fedora-security-team-2025) (2025)
  * [C++](#c-1)
    * [Books and ebooks](#books-and-ebooks-2)
      * [SEI CERT C++ Coding Standard](#sei-cert-c-coding-standard-2006-1) (2006)
  * [C Sharp](#c-sharp)
    * [Books and ebooks](#books-and-ebooks-3)
      * [Security Driven .NET](#-[security](/@harrisonqian/awesome/wiki/security/security)-driven-net-2015) (2015) ![nonfree](img/nonfree.png)
  * [Clojure](#clojure)
    * [Repositories](#repositories)
      * [Clojure OWASP](#[clojure](/@harrisonqian/awesome/wiki/programming-languages/clojure)-owasp-2020) (2020)
  * [Go](#go)
    * [Articles](#articles-1)
      * [Memory [Security](/@harrisonqian/awesome/wiki/security/security) in Go - spacetime.dev](#memory-security-in-go-spacetime-dev-2017) (2017)
  * [Java](#java)
    * [Books and ebooks](#books-and-ebooks-4)
      * [SEI CERT [Java](/@harrisonqian/awesome/wiki/programming-languages/java) Coding Standard](#sei-cert-java-coding-standard-2007) (2007)
      * [Secure Coding Guidelines for [Java](/@harrisonqian/awesome/wiki/programming-languages/java) SE](#secure-coding-guidelines-for-java-se-2014) (2014)
  * [Node.js](#node-js)
    * [Articles](#articles-2)
      * [Node.js [Security](/@harrisonqian/awesome/wiki/security/security) Checklist - Rising Stack Blog](#node-js-security-checklist-rising-stack-blog-2015) (2015)
      * [Awesome [Electron](/@harrisonqian/awesome/wiki/platforms/electron).js [hacking](/@harrisonqian/awesome/wiki/security/hacking) & pentesting resources](#[awesome](/@harrisonqian/awesome/wiki/miscellaneous/awesome)-electron-js-hacking-pentesting-resources-2020) (2020)
    * [Books and ebooks](#books-and-ebooks-5)
      * [Essential [Node.js](/@harrisonqian/awesome/wiki/platforms/node-js) Security](#-essential-node-js-[security](/@harrisonqian/awesome/wiki/security/security)-2017) (2017) ![nonfree](img/nonfree.png)
    * [Training](#training)
      * [Security Training by ^Lift Security](#-[security](/@harrisonqian/awesome/wiki/security/security)-training-by-lift-security) ![nonfree](img/nonfree.png)
      * [Security Training from BinaryMist](#-[security](/@harrisonqian/awesome/wiki/security/security)-training-from-binarymist) ![nonfree](img/nonfree.png)
  * [PHP](#php)
    * [Articles](#articles-3)
      * [It's All About Time](#its-all-about-time-2014) (2014)
      * [Secure Authentication in PHP with Long-Term Persistence](#secure-authentication-in-php-with-long-term-persistence-2015) (2015)
      * [20 Point List For Preventing Cross-Site Scripting In PHP](#20-point-list-for-preventing-cross-site-scripting-in-php-2013) (2013)
      * [25 PHP [Security](/@harrisonqian/awesome/wiki/security/security) Best Practices For Sys Admins](#25-php-security-best-practices-for-sys-admins-2011) (2011)
      * [PHP data encryption primer](#php-data-encryption-primer-2014) (2014)
      * [Preventing SQL Injection in PHP Applications - the Easy and Definitive Guide](#preventing-sql-injection-in-php-applications-the-easy-and-definitive-guide-2014) (2014)
      * [You Wouldn't Base64 a Password - [Cryptography](/@harrisonqian/awesome/wiki/computer-science/cryptography) Decoded](#you-wouldnt-base64-a-password-cryptography-decoded-2015) (2015)
      * [A Guide to Secure Data Encryption in PHP Applications](#a-guide-to-secure-data-encryption-in-php-applications-2015) (2015)
      * [The 2018 Guide to Building Secure PHP Software](#the-2018-guide-to-building-secure-php-software-2017) (2017)
    * [Books and ebooks](#books-and-ebooks-6)
      * [Securing PHP: [Core](/@harrisonqian/awesome/wiki/platforms/core) Concepts](#-securing-php-core-concepts) ![nonfree](img/nonfree.png)
      * [Using Libsodium in PHP Projects](#using-libsodium-in-php-projects)
    * [Useful libraries](#useful-libraries)
      * [defuse/php-encryption](#defusephp-encryption)
      * [ircmaxell/password_compat](#ircmaxellpassword-compat)
      * [ircmaxell/RandomLib](#ircmaxellrandomlib)
      * [thephpleague/oauth2-server](#thephpleagueoauth2-server)
      * [paragonie/random_compat](#paragonierandom-compat)
      * [psecio/gatekeeper](#pseciogatekeeper)
      * [openwall/phpass](#openwallphpass)
    * [Websites](#websites-1)
      * [websec.io](#websec-io)
      * [Blogs](#blogs-1)
        * [Paragon Initiative Enterprises Blog](#paragon-initiative-enterprises-blog)
        * [ircmaxell's blog](#ircmaxells-blog)
        * [Pádraic Brady's Blog](#p%C3%A1draic-bradys-blog)
      * [Mailing lists](#mailing-lists)
        * [Securing PHP Weekly](#securing-php-weekly)
  * [Perl](#perl)
    * [Books and ebooks](#books-and-ebooks-7)
      * [SEI CERT [Perl](/@harrisonqian/awesome/wiki/programming-languages/perl) Coding Standard](#sei-cert-perl-coding-standard-2011) (2011)
  * [Python](#python)
    * [Books and ebooks](#books-and-ebooks-8)
      * [Python chapter of Fedora Defensive Coding Guide](#[python](/@harrisonqian/awesome/wiki/programming-languages/python)-chapter-of-fedora-defensive-coding-guide)
      * [Black Hat [Python](/@harrisonqian/awesome/wiki/programming-languages/python): Python Programming for Hackers and Pentesters](#-black-hat-python-python-programming-for-hackers-and-pentesters) ![nonfree](img/nonfree.png)
      * [Violent Python](#-violent-python) ![nonfree](img/nonfree.png)
    * [Websites](#websites-2)
      * [OWASP [Python](/@harrisonqian/awesome/wiki/programming-languages/python) [Security](/@harrisonqian/awesome/wiki/security/security) Wiki](#owasp-python-security-wiki-2014) (2014)
  * [Ruby](#ruby)
    * [Books and ebooks](#books-and-ebooks-9)
      * [Secure [Ruby](/@harrisonqian/awesome/wiki/programming-languages/ruby) Development Guide](#secure-ruby-development-guide-2014) (2014)

# General

## Articles

### [How to Safely Generate a Random Number](http://sockpuppet.org/blog/2014/02/25/safely-generate-random-numbers/) (2014)

**Released**: February 25, 2014

Advice on cryptographically secure pseudo-random number generators.

### [Salted Password Hashing - Doing it Right](https://crackstation.net/hashing-security.htm) (2014)

**Released**: August 6, 2014

A post on [Crackstation](https://crackstation.net), a project by [Defuse Security](https://defuse.ca)

### [A good idea with bad usage: /dev/urandom](http://insanecoding.blogspot.co.uk/2014/05/a-good-idea-with-bad-usage-devurandom.html) (2014)

**Released**: May 3, 2014

Mentions many ways to make `/dev/urandom` fail on Linux/BSD.

### [Why Invest in Application Security?](https://paragonie.com/white-paper/2015-why-invest-application-security) (2015)

**Released**: June 21, 2015

Running a business requires being cost-conscious and minimizing unnecessary spending. The benefits of ensuring in the security of your application are invisible to most companies, so often times they neglect to invest in secure software development as a cost-saving measure. What these companies don't realize is the potential cost (both financial and to brand reputation) a preventable data compromise can incur.

**The average data breach costs millions of dollars in damage.**

Investing more time and personnel to develop secure software is, for most companies, worth it to minimize this unnecessary risk to their bottom line.

### [Be wary of one-time pads and other crypto unicorns](https://freedom-to-tinker.com/blog/jbonneau/be-wary-of-one-time-pads-and-other-crypto-unicorns/) (2015)

**Released**: March 25, 2015

A **must-read** for anyone looking to build their own cryptography features.

## Books

### ![nonfree](img/nonfree.png) [Web Application Hacker's Handbook](http://mdsec.net/wahh) (2011)

**Released**: September 27, 2011

Great introduction to Web Application Security; though slightly dated.

### ![nonfree](img/nonfree.png) [Cryptography Engineering](http://www.amazon.com/Cryptography-Engineering-Principles-Practical-Applications/dp/0470474246) (2010)

**Released**: March 15, 2010

Develops a sense of professional paranoia while presenting crypto design techniques.

### ![nonfree](img/nonfree.png) [Securing DevOps](https://www.manning.com/books/securing-devops?a_aid=securingdevops&a_bid=1353bcd8) (2018)

**Released**: March 1, 2018

Securing DevOps explores how the techniques of DevOps and Security should be applied together to make cloud services safer. This introductory book reviews state of the art practices used in securing web applications and their infrastructure, and teaches you techniques to integrate security directly into your product.

### ![nonfree](img/nonfree.png) [Gray Hat Python: Programming for Hackers and Reverse Engineers](http://www.amazon.com/Gray-Hat-Python-Programming-Engineers/dp/1593271921) (2009)

**Released**: May 3, 2009

### ![nonfree](img/nonfree.png) [The Art of Software Security Assessment: Identifying and Preventing Software Vulnerabilities](http://www.amazon.com/The-Software-Security-Assessment-Vulnerabilities/dp/0321444426/) (2006)

**Released**: November 30, 2006

### ![nonfree](img/nonfree.png) [C Interfaces and Implementations: Techniques for Creating Reusable Software](http://www.amazon.com/Interfaces-Implementations-Techniques-Creating-Reusable/dp/0201498413/) (1996)

**Released**: August 30, 1996

### ![nonfree](img/nonfree.png) [Reversing: Secrets of Reverse Engineering](http://www.amazon.com/Reversing-Secrets-Engineering-Eldad-Eilam/dp/0764574817) (2005)

**Released**: April 15, 2005

### ![nonfree](img/nonfree.png) [JavaScript: The Good parts](http://www.amazon.com/JavaScript-Good-Parts-Douglas-Crockford/dp/0596517742) (2008)

**Released**: May 1, 2008

### ![nonfree](img/nonfree.png) [Windows Internals: Including Windows Server 2008 and Windows Vista, Fifth Edition ](http://www.amazon.com/Windows%C2%AE-Internals-Including-Developer-Reference/dp/0735625301) (2007)

**Released**: June 17, 2007

### ![nonfree](img/nonfree.png) [The Mac Hacker's Handbook](http://www.amazon.com/The-Hackers-Handbook-Charlie-Miller/dp/0470395362) (2009)

**Released**: March 3, 2009

### ![nonfree](img/nonfree.png) [The IDA Pro Book: The Unofficial Guide to the World's Most Popular Disassembler](http://www.amazon.com/The-IDA-Pro-Book-Disassembler/dp/1593271786) (2008)

**Released**: August 22, 2008

### ![nonfree](img/nonfree.png) [Internetworking with TCP/IP Vol. II: ANSI C Version: Design, Implementation, and Internals (3rd Edition)](http://www.amazon.com/Internetworking-TCP-Vol-Implementation-Internals/dp/0139738436) (1998)

**Released**: June 25, 1998

### ![nonfree](img/nonfree.png) [Network Algorithmics,: An Interdisciplinary Approach to Designing Fast Networked Devices](http://www.amazon.com/Network-Algorithmics-Interdisciplinary-Designing-Networking/dp/0120884771) (2004)

**Released**: December 29, 2004

### ![nonfree](img/nonfree.png) [Computation Structures (MIT Electrical Engineering and Computer Science)](http://www.amazon.com/Computation-Structures-Electrical-Engineering-Computer/dp/0262231395) (1989)

**Released**: December 13, 1989

### ![nonfree](img/nonfree.png) [Surreptitious Software: Obfuscation, Watermarking, and Tamperproofing for Software Protection](http://www.amazon.com/Surreptitious-Software-Obfuscation-Watermarking-Tamperproofing/dp/0321549252) (2009)

**Released**: August 3, 2009

### [Secure Programming HOWTO](http://www.dwheeler.com/secure-programs/) (2015)

**Released**: March 1, 2015

### [Security Engineering - Third Edition](https://www.cl.cam.ac.uk/~rja14/book.html) (2020)

**Released**: November 1, 2020

### ![nonfree](img/nonfree.png) [Bulletproof SSL and TLS](https://www.feistyduck.com/books/bulletproof-ssl-and-tls/) (2014)

**Released**: August 1, 2014

### [Holistic Info-Sec for Web Developers (Fascicle 0)](https://leanpub.com/holistic-infosec-for-web-developers) (2016)

**Released**: September 17, 2016

The first part of a three part book series providing broad and in-depth coverage on what web developers and architects need to know in order to create robust, reliable, maintainable and secure software, networks and other, that are delivered continuously, on time, with no nasty surprises.

### [Holistic Info-Sec for Web Developers (Fascicle 1)](https://leanpub.com/holistic-infosec-for-web-developers-fascicle1-vps-network-cloud-webapplications)

The second part of a three part book series providing broad and in-depth coverage on what web developers and architects need to know in order to create robust, reliable, maintainable and secure software, VPS, networks, cloud and web applications, that are delivered continuously, on time, with no nasty surprises.

## Classes

### [Offensive Computer Security (CIS 4930) FSU](https://www.cs.fsu.edu/~redwood/OffensiveComputerSecurity/)

A vulnerability research and exploit development class by Owen Redwood of Florida State University. 

**Be sure to check out the [lectures](https://www.cs.fsu.edu/~redwood/OffensiveComputerSecurity/lectures.html)!**

### [Hack Night](https://github.com/isislab/Hack-Night)

Developed from the materials of NYU Poly's old Penetration Testing and Vulnerability Analysis course, Hack Night is a sobering introduction to offensive security. A lot of complex technical content is covered very quickly as students are introduced to a wide variety of complex and immersive topics over thirteen weeks.

## Websites

### [Hack This Site!](http://www.hackthissite.org)

Learn about application security by attempting to hack this website.

### [Enigma Group](http://www.enigmagroup.org)

Where hackers and security experts come to train.

### [Web App Sec Quiz](https://timoh6.github.io/WebAppSecQuiz/)

Self-assessment quiz for web application security

### [SecurePasswords.info](https://securepasswords.info)

Secure passwords in several languages/frameworks.

### [Security News Feeds Cheat-Sheet](http://lzone.de/cheat-sheet/Security-News-Feeds)

A list of security news sources.

### [Open Security Training](http://opensecuritytraining.info/)

Video courses on low-level x86 programming, hacking, and forensics.

### [MicroCorruption](https://microcorruption.com/login)

Capture The Flag - Learn Assembly and Embedded Device Security

### [The Matasano Crypto Challenges](http://cryptopals.com)

A series of programming exercises for teaching oneself cryptography by [Matasano Security](http://matasano.com). [The introduction](https://blog.pinboard.in/2013/04/the_matasano_crypto_challenges) by Maciej Ceglowski explains it well.

### [PentesterLab](https://pentesterlab.com)

PentesterLab provides [free Hands-On exercises](https://pentesterlab.com/exercises/) and a [bootcamp](https://pentesterlab.com/bootcamp/) to get started.

### [Juice Shop](https://bkimminich.github.io/juice-shop)

An intentionally insecure Javascript Web Application.

### [Supercar Showdown](http://hackyourselffirst.troyhunt.com/)

How to go on the offence before online attackers do.

### [OWASP NodeGoat](https://github.com/owasp/nodegoat)

Purposly vulnerable to the OWASP Top 10 Node.JS web application, with [tutorials](https://nodegoat.herokuapp.com/tutorial), [security regression testing with the OWASP Zap API](https://github.com/OWASP/NodeGoat/wiki/NodeGoat-Security-Regression-tests-with-ZAP-API), [docker image](https://github.com/owasp/nodegoat#option-3---run-nodegoat-on-docker). With several options to get up and running fast.

### [Securing The Stack](https://securingthestack.com)

Bi-Weekly Appsec Tutorials

### [OWASP ServerlessGoat](https://www.owasp.org/index.php/OWASP_Serverless_Goat)

OWASP ServerlessGoat is a deliberately insecure realistic AWS Lambda serverless application, maintained by OWASP and created by [PureSec](https://www.puresec.io/). You can install WebGoat, learn about the vulnerabilities, how to exploit them, and how to remediate each issue. The project also includes documentation explaining the issues and how they should be remediated with best-practices.

### [SecDim](https://secdim.com)

SecDim is an appsec edutainment platform, [Learn](https://learn.secdim.com) appsec with free git based labs. Think you got what it takes to build a secure app? [Challenge yourself](https://play.secdim.com) with appsec games! Fix bugs, get a score and your name on the leaderboards.

### Blogs

#### [Crypto Fails](http://cryptofails.com)

Showcasing bad cryptography

#### [NCC Group - Blog](https://www.nccgroup.trust/us/about-us/newsroom-and-events/blog/)

The blog of NCC Group, formerly Matasano, iSEC Partners, and NGS Secure.

#### [Scott Helme](https://scotthelme.co.uk)

Learn about security and performance.

#### [Cossack Labs blog](https://www.cossacklabs.com/blog-archive/) (2018)

**Released**: July 30, 2018

Blog of cryptographic company that makes open-source libraries and tools, and describes practical data security approaches for applications and infrastructures.

### Wiki pages

#### [OWASP Top Ten Project](https://www.owasp.org/index.php/Category:OWASP_Top_Ten_Project)

The top ten most common and critical security vulnerabilities found in web applications.

### Tools

#### [Qualys SSL Labs](https://www.ssllabs.com/)

The infamous suite of SSL and TLS tools.

#### [securityheaders.io](https://securityheaders.io/)

Quickly and easily assess the security of your HTTP response headers.

#### [report-uri.io](https://report-uri.io)

A free CSP and HPKP reporting service.

#### [clickjacker.io](https://clickjacker.io)

Test and learn Clickjacking. Make clickjacking PoC, take screenshot and share link. You can test HTTPS, HTTP, intranet & internal sites.

# AWS Lambda

## Tools

### [PureSec FunctionShield](https://www.puresec.io/function-shield)

FunctionShield is a 100% free AWS Lambda security and Google Cloud Functions security library that equips developers with the ability to easily enforce strict security controls on serverless runtimes.

# Android

## Books and ebooks

### [SEI CERT Android Secure Coding Standard](https://www.securecoding.cert.org/confluence/display/android/Android+Secure+Coding+Standard) (2015)

**Released**: February 24, 2015

A community-maintained Wiki detailing secure coding standards for Android development.

# C

## Books and ebooks

### [SEI CERT C Coding Standard](https://www.securecoding.cert.org/confluence/display/c/SEI+CERT+C+Coding+Standard) (2006)

**Released**: May 24, 2006

A community-maintained Wiki detailing secure coding standards for C programming.

### [Defensive Coding: A Guide to Improving Software Security by the Fedora Security Team](https://docs.fedoraproject.org/en-US/Fedora_Security_Team/1/html/Defensive_Coding/index.html) (2025)

**Released**: February 22, 2025

Provides guidelines for improving software security through secure coding. Covers common programming languages and libraries, and focuses on concrete recommendations.

# C++

## Books and ebooks

### [SEI CERT C++ Coding Standard](https://www.securecoding.cert.org/confluence/pages/viewpage.action?pageId=637) (2006)

**Released**: July 18, 2006

A community-maintained Wiki detailing secure coding standards for C++ programming.

# C Sharp

## Books and ebooks

### ![nonfree](img/nonfree.png) [Security Driven .NET](http://securitydriven.net/) (2015)

**Released**: July 14, 2015

An introduction to developing secure applications targeting version 4.5 of the .NET Framework, specifically covering cryptography and security engineering topics.

# Clojure

## Repositories

### [Clojure OWASP](https://github.com/nubank/clj-owasp) (2020)

**Released**: May 5, 2020

Repository with Clojure examples of OWASP top 10 vulnerabilities.

# Go

## Articles

### [Memory Security in Go - spacetime.dev](https://spacetime.dev/memory-security-go) (2017)

**Released**: August 3, 2017

A guide to managing sensitive data in memory.

# Java

## Books and ebooks

### [SEI CERT Java Coding Standard](https://www.securecoding.cert.org/confluence/display/java/SEI+CERT+Oracle+Coding+Standard+for+Java) (2007)

**Released**: January 12, 2007

A community-maintained Wiki detailing secure coding standards for Java programming.

### [Secure Coding Guidelines for Java SE](http://www.oracle.com/technetwork/java/seccodeguide-139067.html) (2014)

**Released**: April 2, 2014

Secure Java programming guidelines straight from Oracle.

# Node.js

## Articles

### [Node.js Security Checklist - Rising Stack Blog](https://blog.risingstack.com/node-js-security-checklist/) (2015)

**Released**: October 13, 2015

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*truncated — [full list on GitHub](https://github.com/paragonie/awesome-appsec)*
