Day	Challenge	Category
1	Secure Bank	OSINT
2	Sleigh redirects	HTTP + programming
3	Secret message	password cracking
4	Lorem Ipsum	forensics (pdf)
5	Elfs program	reverse engineering (.NET)
6	x.owasp.si	cloud (AWS S3)
7	Letter to Santa	cryptography
8	Tech-savvy kid	forensics (text)
9	Icevault	reverse engineering (android)
10	Present	JS deobfuscation + cryptography
11	y.owasp.si	cloud (AWS Lambda)
12	Light show	reverse engineering
13	Weird transmissions	forensics (network)
14	Naughty and nice list	HTTP + cryptography (AES)
15	Santa Claus	steganography (SVG)
16	Send a letter	web (XXE)
17	Best of jokes	binary exploitation (pwn)
18	Santa's Authenticator	reverse engineering (android)
19	Reindeer Tracker 5000	reverse engineering (.NET)
20	SharePoint	cloud (SharePoint)
21	Gravity Falls	web
22	Baby Format	binary exploitation (pwn)
23	Keygen to the Kingdom	reverse engineering (c)
24	Santa's Web Challenge	web