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Re: Challenge "Keyshanc - Part 1"

 On Nov. 27, 2012, 11:19 a.m.

i cant download the additional file, the link is downloading once again the pdf of the challenge.
dear admin could you please check this?

Re: Challenge

 On March 21, 2012, 10:24 p.m.

really enjoyed it! thanks

Re: Challenge

 On Feb. 9, 2012, 4:10 p.m.

same for me, tried both the 1023 format and just the exact 510 bits, nothing…

Re: Challenge

 On Feb. 8, 2012, 11:42 p.m.

I do not agree that you do not agree :D

if i take literally the hints as a procedure to compute d'
namely approx \phi(N) ~ N and solve for

d' * e = 1+s*…

Re: Challenge

 On Feb. 8, 2012, 4:47 p.m.

ok, i'll wait for the author to answer all the previous comments, i wasted many attempts trying all the possible answer for my d'

d' as it is

d' padded o…

Re: Challenge "Lunchtime Attack on FHE"

 On Dec. 30, 2011, 6:36 p.m.

Nice nice nice!!!

Re: Challenge

 On Dec. 22, 2011, 11:33 a.m.

Damn you :D I had to try a couple of times!!!

Re: Challenge "Monoalphabetic Substitution"

 On Dec. 16, 2011, 5:26 p.m.

A small hint since i got stucked in inserting the solution as well

1) with characters it is meant letters only
2) with encrypted alphabet it is meant
A en…

Re: Challenge "Kaskade-S/T – Part 1"

 On Dec. 14, 2011, 3:55 p.m.

I am enjoying the challenges on this site and am getting quite a bit of experience.

Basically I did it by hand and ended up with an "alphabet key". I…

Re: Challenge

 On Dec. 9, 2011, 9:09 p.m.

yes yes of course!! mine was a (double) stupid writing mistake! thanks for the hints

Re: Challenge

 On Dec. 9, 2011, 11:36 a.m.

I agree with Viktor, probably I am missing something but unless one can spot some semplification (finding the ov form seems unfeasible) we are left with

Re: Challenge

 On Dec. 7, 2011, 9:49 p.m.

Is there any more clever way to solve it than brutally using a library for large integers (i used gmp) and really compute the factorization of a 12mb integer ?…

Re: Challenge "Factorization Cipher - Part 1"

 On Dec. 6, 2011, 7:54 p.m.

That was easy, but yet really nice!!
thanks Viktor
and thanks wolframalpha :D

Re: Challenge "Notes of an Italian Soldier"

 On Dec. 6, 2011, 5:45 p.m.

He is just saying

" I hope everything I just wrote you (to the italian professor ndr) could be helpful"

second note " I used to add to the text some for…

Re: Challenge

 On Dec. 5, 2011, 1:06 p.m.

is it really needed an affine transformation to put the system in oil-vinegar decoupled form or one could just use an invertible matrix?
anyway i thought…

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