Comments on: A story about Chinese, Bells and Injections : CPEU Wargame challenge

By: Eloi Sanfèlix

Eloi Sanfèlix — Tue, 20 Apr 2010 06:02:56 +0000

As you can see from the trackbacks, vierito5 his write-up with the solution of the challenge.

He solved it during the wargame, just out of curiosity, did anyone solve it from here?

By: Crypto04 challenge write-up from Campus Party Europe | It should work...

Crypto04 challenge write-up from Campus Party Europe | It should work... — Mon, 19 Apr 2010 22:57:29 +0000

[...] the information to try the challenge is at Eloi’s blog since he released it as challenge a couple of days ago. Before continuing I [...]

By: Eloi Sanfèlix

Eloi Sanfèlix — Sun, 18 Apr 2010 21:31:42 +0000

@Anonymous , sorry man, your comment went into the Spam queue and didn’t see it till now. Now the file is linked on the post .

@vierito5 Thanks!

By: vierito5

vierito5 — Sun, 18 Apr 2010 19:43:59 +0000

Great challenge! I’ll post my solution in a couple of days, so people can try it first.

By: Eloi Sanfèlix

Eloi Sanfèlix — Sun, 18 Apr 2010 17:13:00 +0000

Hi David,

Sure, I forgot about the encrypted file although you don’t really need it till the end. I’ve just uploaded it to http://www.limited-entropy.com/docs/encrypted.aes .

I’ll update the post. Thanks!

With respect to the signatures, they are exactly signing the same data. It’s just some data completely unrelated to the AES key or AES file or anything. That’s the key, it’s the same data but one of them has a fault and was computed in a wrong way.

Cheers,
Eloi

By: David

David — Sun, 18 Apr 2010 17:08:35 +0000

Hi,

Two things…

1) Is supposed to have access to the encrypted file? This would help.
2) The 2 signatures are about the same data, but… There are obtained using the AES encrypted file, or a specific text?

Thanks,
David

By: Anonymous

Anonymous — Sun, 18 Apr 2010 09:54:00 +0000

Hi,

Thanks for thie chanllenge . But… where is the encrypted file?