CHALLENGES
Free Technical Challenges
Test your skills across security, networking, cloud, cryptography, and more. No login required — just pick a challenge and solve it.
Regex Email Pattern
Write a regex that matches a valid email address.
Linux Permissions Decoder
What permission does rwxr-xr-- give to the group?
JSON API Response Parser
Extract the specific value from this API response.
Hash Function Identification
Identify the hash type from its length and character set.
TCP Three-Way Handshake
What is the correct order of TCP connection establishment?
SQL Injection Spotter
Which line of code is vulnerable to SQL injection?
Dockerfile Security Audit
How many security issues can you spot in this Dockerfile?
Subnet Mask Math
How many usable hosts can this subnet hold?
Caesar Cipher Cracker
Decrypt this ancient Roman message without a computer.
Find the Hidden Flag
Can you spot the flag hidden in this HTML page?
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