I’ve been working with the crypto challenge “Ebola” for some time and i’d like to know if i’m going in the right direction…

Is it anything related to RSA (since thats been my main focus)?

Any tips/hints are also welcome

Think on this challenge as a 20-30 point challenge. Forget RSA it’s much easier (try to crack it without the key).

Thank you! You just saved me allot of work =D

So I’ve pretty much decrypted the whole message (using the technique suggested here: get stuck on Ebola — Hack The Box :: Forums) but I haven’t been able to decrypt a couple of the remaining chars… and these happen to be part of the flag . Does anyone have any suggestions, because I really dont feel like trying out the 12 possible flags on the challenge page

If you have decrypted most of the msg perhaps use that to figure out how it was encrypted.

Yup. You can easily infer the rest (they cannot be what you already have )

I must clearly be overthinking this because i can’t seem to figure out how the message is (d)encrypted… a small clue would be really appreciated

nv guys… i made it… thanks allot and have a good weekend

Could I get another hint? :

Hello there ! If someone’s available, I just need a little hint on Ebola, thought I found the cipher but the decrypted values I got made no sense.

can someone give me a hint for this challenge pls ? tks in advance

I understand how the crypto works and I have the flag (which is/could/should clearly a correct flag), but it fails when I submit it. Anyone who already completed Ebola willing to check my flag? (PM)

@Telduivel said:

I understand how the crypto works and I have the flag (which is/could/should clearly a correct flag), but it fails when I submit it. Anyone who already completed Ebola willing to check my flag? (PM)

Same situation as you. Can anyone check my flag? Please (PM)

Anyone willing to PM me about this? I need a little help understanding a couple of the fundamentals.

I decided to try this by solving it in intended way but I got stuck after getting the 1s and 0s of the key.txt. I am also not sure where to start if I go to Frequency Analysis path because if I use strings command to get the content of the file, there bunch of question marks, and if I use cat command I will get box icons with question marks.

I got it already before the previous year ends. Now, the question is about key.txt.

Solved. There are indeed two ways to solve it. @h3iron is right that this challenge can be considered a 20-30 point challenge. Interesting challenge overall.

I feel like im going in circles here…tried decrypting the key with an algo i found and got garbage…tried to analyze hex in the binary got nothing, same with characters…if anyone could give me a small nudge on which way to start or at least a tool to use would be really appreciated. I feel like i’ve had a thousand false starts

I have been working on this ebola virus since two days,but cannot find a good start…any suggestions will be appreciated and thanks in advance

Things you need to solve:

- Notepad++
- Frequency analyzer
- Brain(for guessing)