Sc21 writeups

There are my writeups on the SecChallenge 2021 challenges

I did not directly include any flags (except for Gates, sort of).

Crypto

• Monoalphabetic MadMax
• Stateless
• Variable length mtp
• Prerecorded
• Oracle

Hardware

• Escape the chains
• The gates of Valhalla
• A safe place
• Crystal from the past
• SPIcy information

Web

• SQpLosIon
• Manual for the apocalypse
• Poison for tomorrow
• Until the end
• Jinja ninja

Reverse

• SerialHacker
• Xenia Laurencia Maria
• :)
• Celestial Yarr Harr Harr
• JuniorPK (did not solve)

Pwn

• c0pydump
• Guidance to Salvation
• KUVID21 (could not solve)
• Roguelike (could not solve)
• Conundrum at El Nit Patroon Rico

Misc

• キーボード・レイアウト
• I use arch btw (could not solve)
• Little Mix
• TBD
• Lost & Found (could not solve)

Sanity Check

• flag was on discord
• it was legend++

Feedback form

• worth no points