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‎README.md

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# CTF-2021-01
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RE - Crypto - Forensics - Misc (Jan 08 - Jan 18)
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# RTN CTF 2021-01
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- Date: 8th January 2021 - 16th January 2021
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- Topics: re, crypto, forensics, misc
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## Challenges
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### Cryptography
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- [clavdivs](./challenges/crypto/clavdivs/README.md)
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- [mixitup](./challenges/crypto/mixitup/README.md)
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- [ssssecret](./challenges/crypto/ssssecret/README.md)
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- [rehasher](./challenges/crypto/rehasher/README.md)
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- [noncense](./challenges/crypto/noncense/README.md)
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### Reverse Engineering
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- [reverseme](./challenges/re/reverseme/README.md)
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- [radish](./challenges/re/radish/README.md)
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- [press](./challenges/re/press/README.md)
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- [espresso](./challenges/re/espresso/README.md)
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- [saturn](./challenges/re/saturn/README.md)
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- [lambdastic](./challenges/re/lambdastic/README.md)
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### Miscellaneous
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- [matryoshka](./challenges/misc/matryoshka/README.md)
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- [webcat](./challenges/misc/webcat/README.md)
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### Forensics
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- [dragons](./challenges/misc/dragons/README.md)
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- [unknown_file](./challenges/misc/unknown_file/README.md)

‎challenges/crypto/clavdivs/README.md

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AVE CLAVDIVS!

‎challenges/crypto/clavdivs/message.txt

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AVE CLAVDIVS!
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MOIv/q.Z>\`n/mZH+m,opm,ZO.ZN/gpo\iox%

‎challenges/crypto/mixitup/README.md

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We intercepted some secret pictures of which we believe contains a prototype of our competitor's newest smoothie recipe. It seems that they have mixed up more than just fruits eXclusively. Can you help us finding out what they added?

‎challenges/crypto/mixitup/mixitup.zip

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‎challenges/crypto/noncense/README.md

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Dear RTN,
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As you might know, I am the CEO of False Fruits Ltd, and we are one of the main producers of smoothies in the country.
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Recently, I received a message from our IT department that our security system has problems. Two of our employees did not follow the protocol to the letter, which resulted in the formula of our latest smoothie getting leaked to the public.
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As one of our regulars, it is my duty to inform you about any possible security breaches in our systems. We are still investigating this incident, but since you are an expert in the field, any help is appreciated.
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Attached are some of the documents that resurfaced which you might find interesting.
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Best regards,
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Dr. E. Zecutive
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CEO of False Fruits Ltd
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P.S: The IT department said something about SHA 256 and public keys. Personally I have a hard time making heads and tails out of this nonsense.

‎challenges/crypto/noncense/noncense.zip

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‎challenges/crypto/rehasher/README.md

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I wrote a new asymmetric encryption algorithm, and it is truly unbreakable!

‎challenges/crypto/rehasher/rehasher.zip

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‎challenges/crypto/ssssecret/README.md

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Let's share a secret...

‎challenges/crypto/ssssecret/message.txt

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I want to share a secret,
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A secret dear to me.
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But the secret to keeping a secret
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Is to never give out the key.
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So I broke it up in little pieces
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As small as they can be.
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Then after that you wouldn't expect
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I handed them out for free.
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Follow up these pieces
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Understand them to a degree
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At the very root of it all
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The answer you will see
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AES-ECB('6eeb7683e9242ed56080e847c2f94cfc50634c29a3a50f14b31e7e3f97e34df0', key)
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(1, d8877abe8c795a869b1fe28ed9a328a4)
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(2, 1a1c134fc5c474899ee9d573b8895388)
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(3, da143ab7a656e69a91b22414de846d0e)
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(4, e4c6d40f50bd5f37d5c2f5e356a0af94)
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(5, f344401d9a20a8ea1f08598434bfbf8e)
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‎challenges/forensics/dragons/README.md

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Here at RTN be dragons!
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But where are they really?

‎challenges/forensics/dragons/dragons.zip

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‎challenges/forensics/unknown_file/README.md

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I don't really know what to make of this file. I wish there was a way to visualize it, but all I see are blocks of data...

‎challenges/forensics/unknown_file/unknown_file.zip

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‎challenges/misc/matryoshka/README.md

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Today I downloaded the full blockchain for RTN COIN. This surely took up lots of space, so I compressed it!
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Then I compressed it again!
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And again!
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And again!
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I compressed so many times, I surely won't have to worry about space anymore! Every professional would approve.

‎challenges/misc/matryoshka/matryoshka.zip

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‎challenges/misc/webcat/README.md

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My cat is a true polyglot. He speaks over 80 languages, including the weird language of letni!
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To showcase his brilliance, I set up a website that allows you to interact with him. Come and check it out:
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http://smoothie.rtn-team.cc/
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Be aware, he has a bit of an ego. He is very picky with whom he interacts with, and has a relatively short attention span. Be sure to say "hello" first and let him get accustomed to you!

‎challenges/re/espresso/README.md

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Welcome to the RTN lounge! You can kick back and relax here!
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Would you like a drink? Hop over to the coffee machine and pick your favourite hot beverage!
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---
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Compatibility Note:
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At least Java 11+ is required. If the application does not run out of the box on your machine, make sure you have `jvm.dll` in your PATH (Windows) or `libjvm.so` in your LD_LIBRARY_PATH (Linux). This is usually located in the following directories:
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Windows:
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- C:\Program Files\Java\jdk-11.x.x\bin\server
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Linux:
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- /usr/lib/jvm/default/lib/server
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Download: https://adoptopenjdk.net/?variant=openjdk11&jvmVariant=hotspot

‎challenges/re/espresso/espresso.zip

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‎challenges/re/lambdastic/README.md

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I heard you liked Monads.

‎challenges/re/lambdastic/lambdastic.zip

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‎challenges/re/press/README.md

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Less is more. Compressed flags are nicer. We are not a fan of inflation, are we?

‎challenges/re/press/press.zip

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‎challenges/re/radish/README.md

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Radish are roots that are very healthy; they provide a good base for a delicious smoothie! Which one is your favourite?

‎challenges/re/radish/radish.zip

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‎challenges/re/reverseme/README.md

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So you think you are a reverser huh? Reverse this one for me and prove your worth!

‎challenges/re/reverseme/ReverseMe.zip

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‎challenges/re/saturn/README.md

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March 12, 2205
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Our expediction with the SATurn XII to the Smoo-T48 system proved to be very fruitful. Lots of great planets rich with useful minerals!
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We must set course back to Earth immediately and report our findings, but we ran into a snag. Our automatic navigation system is broken. As annoying as it is, we have to resort to the manual navigation system, but it has been years since I have done this. I know my formulae are right, I just can't seem to find the solution that doesn't result in us colliding with some random asteroid or planet in the simulations...

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