csictf 2020

CTF Writeup - https://ctftime.org/event/1081

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little RSA

The flag.zip contains the flag I am looking for but it is password protected. The password is the encrypted message which has to be correctly decrypted so I can useit to open the zip file. I tried using RSA but the zip doesn’t open by it. Can you help me get the flag please?

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The-Climb

We are not lost, we’re right here somewhere on this little blue line. Wait, why do I feel like I’m being watched?

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Quick Math

Ben has encrypted a message with the same value of ‘e’ for 3 public moduli

  • n1 = 86812553978993
  • n2 = 81744303091421
  • n3 = 83695120256591
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Modern Clueless Child

‘I was surfing the crimson wave and oh my gosh I was totally bugging. I also tried out the lilac hair trend but it didn’t work out. That’s not to say you are any better, you are a snob and a half. But let’s get back to the main question here- Who am I? (You don’t know my name)’

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Mein Kampf

“We have intercepted the enemy’s communications, but unfortunately, some data was corrupted during transmission. Can you recover the message?” M4 UKW $ Gamma 2 4 $ 5 9 $ 14 3 $ 5 20 fv cd hu ik es op yl wq jm

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