About me:
You will sometimes find me at question about easier theoretical stuff and mostly you'll see me concerned with protocols, password-hashing, easier classical primitives (ECC, RSA, ...), usage of crypto and other such stuff.
And yes: "stuff" is a fully valid technical term to describe various things
Cryptography
Q&A for software developers, mathematicians and others interested in cryptography
Information Security
Q&A for information security professionals
Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Hardware Recommendations
Q&A for people seeking specific hardware recommendations
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Mathematics
Q&A for people studying math at any level and professionals in related fields
History
Q&A for historians and history buffs
Server Fault
Q&A for system and network administrators
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
Computer Science
Q&A for students, researchers and practitioners of computer science
Academia
Q&A for academics and those enrolled in higher education
Matter Modeling
Q&A for materials modelers and data scientists
Software Recommendations
Q&A for people seeking specific software recommendations
Stack Overflow
Q&A for professional and enthusiast programmers
Super User
Q&A for computer enthusiasts and power users
Board & Card Games
Q&A for people who like playing board games, designing board games or modifying the rules of existing board games
Politics
Q&A for people interested in governments, policies, and political processes
Law
Q&A for legal professionals, students, and others with experience or interest in law
Physics
Q&A for active researchers, academics and students of physics
Martial Arts
Q&A for students and teachers of all martial arts
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Code Review
Q&A for peer programmer code reviews
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
Arqade
Q&A for passionate videogamers on all platforms
Network Engineering
Q&A for network engineers
German Language
Q&A for speakers of German wanting to discuss the finer points of the language and translation
Bitcoin
Q&A for Bitcoin users, developers, and enthusiasts
Monero
Q&A for developers and users of the secure, private and untraceable cryptocurrency Monero
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
Travel
Q&A for road warriors and seasoned travelers
Stack Apps
Q&A for apps, scripts, and development with the Stack Exchange API
Quantum Computing
Q&A for engineers, scientists, programmers, and computing professionals interested in quantum computing
Project Management
Q&A for project managers
Personal Finance & Money
Q&A for people who want to be financially literate
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
Community Building
Q&A for community managers, administrators, and moderators
Ask Patents
Q&A for people interested in improving the patent system
Area 51
Q&A for proposing new sites in the Stack Exchange network