sommeri / matasano-cryptopals-solutions Goto Github PK

hey there, first of all ty for the code. But i got a Problem with Shiro, i installed it as i have been told to by their website. but how can i access their librarys? Can't find anything useful on the web.
Greetings

As I understand from your challenge 14 docs you're just asking the server again for ciphertext until you see three consecutive blocks, i.e. until the prepended random blob is blocksize long.

But I think (thought not sure) you misunderstood challenge 14 and it's a bit harder than you thought.

Now generate a random count of random bytes and prepend this string to every plaintext.

As I understand it, you should:

1. Generate a random count of random bytes.
2. Prepend this string (always the same!) to every plaintext. Just like the key is shared for all runs.

I was confused just like you, but I noticed...

AES-128-ECB(random-prefix || attacker-controlled || target-bytes, random-key)

...uses the same notation (random-) both for prefix and for key which suggests both are, in fact, fixed throughout all encryptions. I think that the fact that it makes the challenge (slightly) harder reinforces the idea.

Of course I might be wrong and maybe you got it right, but I still thought I should ping you in case you were interested on revisiting the challenge :)

Part of the point of these challenges is that there isn't a solution. Having these right here as the 3rd link on google takes away the value of the cryptopals challenges for others. That's my opinion... but in the front page of the site they describe how when it was in email form they asked people not to divulge the answers.