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Re: [SIGNATUR] Certifikat til Anders And



fre, 2002-07-05 kl. 17:08 skrev Anna Jonna Armannsdottir:

> Det kunne egentlig være interessant at undersøge holdbarheden i Stephans
> påstand. Der findes kun ca 20 millioner CPR numre. Dette udledes fra at
> CPR systemet kun tillader 100 år samt at der er 365.25 dage i året samt
> at der er 550 forskellige muligheder for de sidste fire cifre i CPR
> numret når der bruges modulo 11 kontrol. Dette giver altså: 
> 100 x 365.25 x 550 = 20 088 750 

Lige en rettelse her. De sidste fire cifre i personnummeret skal være
mellem 0000 og 4999 for folk der er født før år 2000. Dette betyder
reelt set en halvering af mulighederne. Dvs. at der er 275 muligheder
for hver fødselsdag i det tyvende århundrede. Dette medfører også at det
samlede antal muligheder nu er på ca 10 millioner. 

Dette svarer til det antal muligheder der er for en adgangskode på 4 til
5 tegn. Det burde ikke være særlig svært at bruteforce-cracke dette.  

-- 
med venlig hilsen, Anna Jonna Armannsdottir       
                       ...ooO0Ooo...
»Det seneste år har vist os mere end nogensinde, at hvis
menneskerettigheder ofres i kampen for fred og sikkerhed, 
så bliver der ingen fred og ingen sikkerhed«.
        Irene Khan, Amnesty Internationals generalsekretær.



 
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