Website : http://zeromutarts.de/

Question :

You were able to hear some whispering on the last crypto party! *whisper* d is 35181901. Keep it secret or we are doomed!

There are 2 files namely rsa.py and rsa.txt,you can download it from here..

the-magic-of-rsa

Answer:

I would suggest to read about RSA here in wiki

RSA_(algorithm)

the parameters we know is n,e and d

oh wait!! what is d? look at the question.. d is 35181901

plain-text = (cipher-text)^d mod n

This is the formula.we know all the parameters.Ciphertext is the one in rsa.txt. I would suggest you to write it in a script because trust me you will learn a lot.

Anyway you could use this website as well :

RSA Calculator

substituting d,n and the ciphertext we would get

flag{you_got_the_basics_my_padawan}

FLAG : you_got_the_basics_my_padawan

Question :

You were able to hear some whispering on the last crypto party! *whisper* d is 35181901. Keep it secret or we are doomed!

There are 2 files namely rsa.py and rsa.txt,you can download it from here..

the-magic-of-rsa

Answer:

I would suggest to read about RSA here in wiki

RSA_(algorithm)

the parameters we know is n,e and d

oh wait!! what is d? look at the question.. d is 35181901

plain-text = (cipher-text)^d mod n

This is the formula.we know all the parameters.Ciphertext is the one in rsa.txt. I would suggest you to write it in a script because trust me you will learn a lot.

Anyway you could use this website as well :

RSA Calculator

substituting d,n and the ciphertext we would get

flag{you_got_the_basics_my_padawan}

FLAG : you_got_the_basics_my_padawan

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enter valid comments.Suggestions are most welcome and would be interested in correcting my mistakes.