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19 posts tagged with "Cyber Security"

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· 4 min read

This is a writeup for the E.Tree challenge, part of the Hack the box's Cyberapocalypse CTF 2021, category Web.

Prompt

After many years where humans work under the aliens commands, they have been gradually given access to some of their management applications. Can you hack this alien Employ Directory web app and contribute to the greater human rebellion?

· 4 min read

This is a writeup for the challenge Phasestream 3, part of the Hack the box's Cyberapocalypse CTF 2021, category Crypto.

Propmpt

The aliens have learned the stupidity of their misunderstanding of Kerckhoffs's principle. Now they're going to use a well-known stream cipher (AES in CTR mode) with a strong key. And they'll happily give us poor humans the source because they're so confident it's secure!

· 3 min read

This is a writeup for the challenge Nintendo Base64, part of the Hack the box's Cyberapocalypse CTF 2021, category Crypto.

Prompt

Aliens are trying to cause great misery for the human race by using our own cryptographic technology to encrypt all our games.

Fortunately, the aliens haven't played CryptoHack so they're making several noob mistakes. Therefore they've given us a chance to recover our games and find their flags.

They've tried to scramble data on an N64 but don't seem to understand that encoding and ASCII art are not valid types of encryption!

· 3 min read

This is a writeup for the challenge Phasestream 2, part of the Hack the box's Cyberapocalypse CTF 2021, category Crypto.

Prompt

The aliens have learned of a new concept called "security by obscurity". Fortunately for us they think it is a great idea and not a description of a common mistake. We've intercepted some alien comms and think they are XORing flags with a single-byte key and hiding the result inside 9999 lines of random data, Can you find the flag?