20 posts tagged with "Cyber Security"

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

Prompt​

Let’s read this website in the language of Alines. Or maybe not?

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?

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!

This is a writeup for the challenge Phasestream 4, part of the Hack the box's Cyberapocalypse CTF 2021, category Crypto.

Prompt​

The aliens saw us break PhaseStream 3 and have proposed a quick fix to protect their new cipher.

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!

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

Prompt​

A place to vote your favourite and least favourite puny human emojis!

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

Propmpt​

Aliens heard of this cool newer language called Rust, and hoped the safety it offers could be used to improve their stream cipher.

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

Prompt​

Outdated Alien technology has been found by the human resistance. The system might contain sensitive information that could be of use to us. Our experts are trying to find a way into the system. Can you help?

This is a writeup for the challenge Phasestream 1, part of the Hack the box's Cyberapocalypse CTF 2021, category Crypto.

Phasestream 1​

In the first challenge, we're given a hex code, and the knowledge that it's been encoded using XOR with a 5-byte long key.

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?