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(itstool) path: sect1/para
First, some crypto-relevant info theory:
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Context English Norwegian Bokmål State
$FreeBSD: head/en_US.ISO8859-1/articles/ipsec-must/article.xml 52227 2018-09-06 01:30:47Z ebrandi $
$FreeBSD: head/en_US.ISO8859-1/articles/ipsec-must/article.xml 52227 2018-09-06 01:30:47Z ebrandi $
You installed IPsec and it seems to be working. How do you know? I describe a method for experimentally verifying that IPsec is working.
Du har installert IPsec og det ser ut til å fungere. Hvordan vet du at det fungerer som det skal? Jeg skal beskrive en eksperimentell metode som bekrefter at IPsec fungerer.
The Problem
Problemet
First, lets assume you have <link linkend="ipsec-install"> installed <emphasis>IPsec</emphasis></link>. How do you know it is <link linkend="caveat">working</link>? Sure, your connection will not work if it is misconfigured, and it will work when you finally get it right. <citerefentry><refentrytitle>netstat</refentrytitle><manvolnum>1</manvolnum></citerefentry> will list it. But can you independently confirm it?
Først, la oss anta at du har <link linkend="ipsec-install"> installert <emphasis>IPsec</emphasis></link>. Hvordan vet du at det <link linkend="caveat">fungerer</link>? Jada, forbindelsen din vil ikke fungere hvis den er feilkonfigurert, og den vil fungere når du endelig får det riktig. <citerefentry><refentrytitle>netstat</refentrytitle><manvolnum>1</manvolnum></citerefentry> vill liste det. Men kan du uavhengig bekrefte det?
The Solution
Løsningen
First, some crypto-relevant info theory:
Først, noe krypto-relevant teori:
Encrypted data is uniformly distributed, i.e., has maximal entropy per symbol;
Krypterte data er ensartet distribuert, dvs. har maksimal entropi per symbol;
Raw, uncompressed data is typically redundant, i.e., has sub-maximal entropy.
Rå, ukomprimerte data er typisk overflødige, dvs. har sub-maksimal entropi.
Suppose you could measure the entropy of the data to- and from- your network interface. Then you could see the difference between unencrypted data and encrypted data. This would be true even if some of the data in <quote>encrypted mode</quote> was not encrypted---as the outermost IP header must be if the packet is to be routable.
Anta at du kan måle entropien til dataene til og fra nettverksgrensesnittet ditt. Da kunne du se forskjellen mellom ikke-krypterte data og krypterte data. Dette vil være sant, selv om noen av dataene i <quote> kryptert modus </quote> ikke var kryptert --- som den ytterste IP-overskriften må være hvis pakken skal være rutbar.
MUST
Ueli Maurer's <quote>Universal Statistical Test for Random Bit Generators</quote>(<link xlink:href="https://web.archive.org/web/20011115002319/http://www.geocities.com/SiliconValley/Code/4704/universal.pdf"> <acronym>MUST</acronym></link>) quickly measures the entropy of a sample. It uses a compression-like algorithm. <link linkend="code">The code is given below</link> for a variant which measures successive (~quarter megabyte) chunks of a file.
Ueli Maurers <quote> Universal Statistical Test for Random Bit Generators </quote>(<link xlink:href="https://web.archive.org/web/20011115002319/http://www.geocities.com/SiliconValley/Code/4704/universal.pdf"> <acronym>MUST</acronym></link>) måler raskt entropien til en prøve. Den bruker en kompresjonslignende algoritme. <link linkend="code"> Koden er gitt nedenfor </link> for en variant som måler suksessive (~ kvart megabyte) biter av en fil.

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First, some crypto-relevant info theory:
Først, noe krypto-relevant teori:
5 months ago
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