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Challenge "Alice's Birthday Party (Part 2)"  

  By: admin on May 7, 2010, 2:28 p.m.

Alice has learned from her mistake from last year. This year, she makes sure that the friends to whom she sends invitations for her birthday party all use unique RSA N parameters. However, this time she still makes another mistake that allows an adversary, Eve, to reconstruct the message.Can you again decrypt this year's invitation? The codeword for this challenge is the location of Alice's party.
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 Last edited by: admin on Oct. 31, 2021, 2:54 a.m., edited 1 time in total.

Re: "Alice's birthday party (Part 2)" Discussion  

  By: rincewind on Oct. 5, 2010, 8:04 p.m.

Hi folks, we've updated the challenge in the last few days. We've added some missing parameters to the additional challenge file and had to change the codeword. So just try it again now. Maybe you had the right codeword before…?

Re: Challenge "Alice's Birthday Party (Part 2)"  

  By: Geetharanjini on Sept. 15, 2011, 3:49 a.m.

Hi,
The public keys are mentioned as (N1,e1), (N2,e2) and (N3,e3) but the additional information document specifies only e = 3.
Is the file missing the values of e1, e2 and e3 or are the public keys mentioned wrong?

Re: Challenge "Alice's Birthday Party (Part 2)"  

  By: DarkFibre on Sept. 15, 2011, 5:34 a.m.

e1=e2=e3=e=3

Re: Challenge "Alice's Birthday Party (Part 2)"  

  By: Greko on July 10, 2012, 11:53 a.m.

Hi
I have managed to find out how to solve this one, I mean what are the maths I have to do, although it is the first one of the level II chalenges I try to solve.So I don't know if there is a program or even better a website I can use to do operations with big numbers and to solve equations.Does anybody has anything to reccomend?
Thank you

Re: Challenge "Alice's Birthday Party (Part 2)"  

  By: be on July 10, 2012, 9:10 p.m.

… I don't know if there is a program or even better a website I can use to do operations with big numbers and to solve equations.

A good free and open source computer algebra system is Sage.
Please see the website http://www.sagemath.org/ or the noteboob site http://www.sagenb.org/


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