2015weight 0.00MITRE Cyber Academy

STEM CTF: Cyber Challenge 2015

5 challenges with 7 published community solutions between them. Solution links go to CTFtime’s task page, which aggregates every writeup for a challenge - individual blog posts rot, the aggregator does not.

Full task list on CTFtime

Cryptography3

Recover a plaintext or a key from something that was supposed to protect it. In practice: identify the scheme, find the parameter the author got wrong, exploit it.

Solve it with:Cipher identifier and automatic decoder Vigenere cipher solver with automatic key recovery RSA decryption and attack runner Wiener’s attack on small RSA private exponents In-browser hash cracker with rule transforms Learn: Classical ciphers and frequency analysis Learn: RSA and the parameters that break it

Gravity Falls
100 pts2 writeups
- crypto
Same technique in picoCTF: StegoRSA, Timestamped Secrets, AES-ABC
Holy Krabby Patty, Mermaid Man!
50 pts2 writeups
- crypto
Same technique in picoCTF: StegoRSA, Timestamped Secrets, AES-ABC
Doctor Message
300 pts1 writeup
- crypto
- doctor message
Same technique in picoCTF: StegoRSA, Timestamped Secrets, AES-ABC

Misc2

Everything that fits no other box: esolangs, puzzles, scripting exercises, and the jail escapes that have not yet earned their own category.

Solve it with:Brainfuck and esolang decoder Cipher identifier and automatic decoder Regex tester with match offsets and capture groups Learn: Recognising encodings

Cyberville
500 pts1 writeup
- city
Same technique in picoCTF: Permissions, Specialer, Codebook
Srcamble
100 pts1 writeup
- scamble
- mitre
Same technique in picoCTF: Permissions, Specialer, Codebook

Cryptography3

Gravity Falls

Holy Krabby Patty, Mermaid Man!

Doctor Message

Misc2

Cyberville

Srcamble

Other 2015 events