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fmoraes

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Re: Challenge "Purple 1"

 On Dec. 4, 2014, 11:43 p.m.

Never mind, I did a quick experiment with the tool from Cryptologia and a minor change to the code and the right settings (once I read the comment in the text)…

Re: Challenge "Purple 1"

 On Dec. 4, 2014, 11:24 p.m.

Do I need to worry about the SIXES and TWENTY's or those are fixed like in the program? Seems like on a real Purple machine, we would have to find the sixes an…

Re: Challenge

 On Dec. 3, 2014, 8:33 p.m.

I am retaking my efforts to solve this one. Anybody else working on it?

I have about 32K survivors from phase 1 attack, but my phase 2 attack is way too slo…

Re: Challenge

 On Nov. 26, 2014, 6:01 p.m.

Can someone give me a hint or nudge on how to attack/solve this problem?

Please send me an email and what you tried with Sage. I guess I can gi…

Re: Challenge

 On Nov. 21, 2014, 11:15 p.m.

An additional note for this challenge: The enigma model used in this part of the challenge uses one rotor of a different model (see hints from part 1 and 2)…

Re: Challenge

 On Nov. 18, 2014, 2:08 a.m.

Can someone give me a hint or nudge on how to attack/solve this problem?

I tried to find some literature or papers on attacks on the problem but I have not …

Re: Challenge

 On Nov. 6, 2014, 10:15 p.m.

I will have not been able to solve this one. Even though I think I decoded the file into an alphabet that should make sense (even considering one of the let…

Re: Challenge

 On Nov. 5, 2014, 10:25 p.m.

I will have not been able to solve this one. Even though I think I decoded the file into an alphabet that should make sense (even considering one of the letter…

Re: Notification of new challenges

 On Oct. 16, 2014, 7:47 p.m.

+1

Why not simply create a topic here in the general section, where a short notice is posted whenever a new challgene is online. This does not have to be…

Notification of new challenges

 On Aug. 29, 2014, 10:37 p.m.

On an off topic, is there a way to be notified when new challenges are published?

Re: [solved] Challenge

 On July 2, 2014, 1:11 a.m.

Is there something wrong with the checking of the answer on this challenge? The official numbers don't seem to be accepted.

Re: Challenge

 On Dec. 5, 2013, 6:53 p.m.

I think I found the shift but I am having trouble validating my program. It solves the case of no shift but that wrinkle is causing me some grief.

Would one…

Re: Challenge

 On Nov. 29, 2013, 4:18 p.m.

My problem is with the last part of the hint about solving for x. That appears to be a discrete logarithm problem.

Never mind, I think I figured it out fo…

Re: Challenge

 On Nov. 29, 2013, 2:02 a.m.

Hello Francisco,

have you seen this hint by jomandi:

let N = p*q. the following calculations are modulo p:

let g be a generato…

Re: Challenge

 On Nov. 28, 2013, 4:20 p.m.

Do I need to find the primitive roots mod p and q in order to solve this?

Francisco


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