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r/netsec
323k  subs
A community for technical news and discussion of information security and closely related topics.
https://reddit.com/r/netsec/
A moderated community dedicated to all things reverse engineering.
https://reddit.com/r/ReverseEngineering/
r/blackhat
54k  subs
Blackhat library is here for the ongoing discussion and documentation of vulnerabilities and exploitation techniques, all in one place.
https://reddit.com/r/blackhat/
r/Malware
38k  subs
A place for malware reports and information.
https://reddit.com/r/Malware/
Subreddit for students or anyone studying Network Security. This is the place to ask questions regarding your netsec homework, or perhaps you need resources for certain subjects, either way you'll find them here! If you have info or resources you want added to resources, just let us know!
https://reddit.com/r/netsecstudents/
r/HackBloc
20k  subs
Hacktivism, Crypto-anarchy, Darknets, Free Culture - Proudly Feminist, Anarchist, Anti-Capitalist, Anarchist hackers
https://reddit.com/r/HackBloc/
r/crypto
102k  subs
Cryptography is the art of creating mathematical assurances for who can do what with data, including but not limited the classical example of encrypting messages so that only the key-holder can read it. Cryptography lives at an intersection of math, programming, and computer science. This subreddit covers the theory and practice of modern and *strong* cryptography, and it is a technical subreddit focused on the algorithms and implementations of cryptography.
https://reddit.com/r/crypto/
r/hacking
802k  subs
A subreddit dedicated to hacking and hackers. Constructive collaboration and learning about exploits, industry standards, grey and white hat hacking, new hardware and software hacking technology, sharing ideas and suggestions for small business and personal security.
https://reddit.com/r/hacking/
r/HowToHack
178k  subs
Welcome to the guide by Zempirians to help you along the path from a neophyte to an elite... From here you will learn the resources to expand your knowledge and from there you can access our stronger resources for hands on training and wargames.... Free Public Access to Zempirians Training Lab - http://training.zempirians.com
https://reddit.com/r/HowToHack/
Dedicated towards the branch of forensic science encompassing the recovery and investigation of material found in digital devices, often in relation to computer crime. The field is the application of several information security principles and aims to provide for attribution and event reconstruction following forth from audit processes. This subreddit is not limited to just the computers and encompasses all media that may also fall under digital forensics (e.g., cellphones, video, etc.).
https://reddit.com/r/computerforensics/
r/javascript
667k  subs
All about the JavaScript programming language!
https://reddit.com/r/javascript/
r/linux
414k  subs
All things Linux and GNU/Linux -- this is neither a community exclusively about the kernel Linux, nor is exclusively about the GNU operating system.
https://reddit.com/r/linux/
r/security
102k  subs
A friendly and professional place for discussing computer security.
https://reddit.com/r/security/
r/PHP
104k  subs
Ask questions about frameworks, try your hand at php golf and strike gold or simply show off your latest work.
https://reddit.com/r/PHP/
r/sysadmin
364k  subs
A reddit dedicated to the profession of Computer System Administration.
https://reddit.com/r/sysadmin/
r/compsci
598k  subs
Computer Science Theory and Application. We share and discuss any content that computer scientists find interesting. People from all walks of life welcome, including hackers, hobbyists, professionals, and academics.
https://reddit.com/r/compsci/
r/Defcon
16k  subs
The unofficial subreddit of world's largest hacker convention!
https://reddit.com/r/Defcon/
r/web_design
402k  subs
A community dedicated to all things web design. For more development-related questions, try /r/webdev.
https://reddit.com/r/web_design/
r/Python
406k  subs
news about the dynamic, interpreted, interactive, object-oriented, extensible programming language Python
https://reddit.com/r/Python/
r/webdev
366k  subs
A community dedicated to all things web development: both front-end and back-end. For more design-related questions, try /r/web_design.
https://reddit.com/r/webdev/
r/opensource
86k  subs
A subreddit for everything [open source](http://en.wikipedia.org/wiki/Open_source) related.
https://reddit.com/r/opensource/