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<personname><firstname>David</firstname><surname>Honig</surname></personname><affiliation> <_:address-1/> </affiliation>
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_ translator-credits Sergio Carlavilla carlavilla@FreeBSD.org, 2019
Independent Verification of IPsec Functionality in FreeBSD Verificación independiente de la funcionalidad de IPsec en FreeBSD
<email>honig@sprynet.com</email> <email>honig@sprynet.com</email>
<personname><firstname>David</firstname><surname>Honig</surname></personname><affiliation> <_:address-1/> </affiliation> <personname><firstname>David</firstname><surname>Honig</surname></personname><affiliation> <_:address-1/> </affiliation>
1999-05-03 1999-05-03
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$FreeBSD: head/en_US.ISO8859-1/articles/ipsec-must/article.xml 52227 2018-09-06 01:30:47Z ebrandi $ $FreeBSD$
You installed IPsec and it seems to be working. How do you know? I describe a method for experimentally verifying that IPsec is working. Instaló IPsec y parece estar funcionando. ¿Cómo lo sabe? Describo un método para verificar de forma experimental que IPsec está funcionando.
The Problem El problema
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? Primero, asumamos que ha <link linkend="ipsec-install">instalado <emphasis>IPsec</emphasis></link>. ¿Cómo sabe que está <link linkend="caveat">funcionando</link>? Claro, su conexión no funcionará si está mal configurada, y funcionará cuando finalmente lo haga bien. <citerefentry><refentrytitle>netstat</refentrytitle><manvolnum>1</manvolnum></citerefentry> la listará. ¿Pero puede confirmarlo de forma independiente?
The Solution La solución
First, some crypto-relevant info theory: Primero, alguna información teórica relevante sobre criptografía:
Encrypted data is uniformly distributed, i.e., has maximal entropy per symbol; Los datos cifrados se distribuyen uniformemente, es decir, tienen una entropía máxima por símbolo;
Raw, uncompressed data is typically redundant, i.e., has sub-maximal entropy. Los datos sin procesar y sin comprimir suelen ser redundantes, es decir, tienen una entropía submáxima.
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. Suponga que usted pudiera medir la entropía de los datos que van hacia -y desde- su interfaz de red. Entonces podría ver la diferencia entre los datos no cifrados y los cifrados. Esto sería verdad incluso si algunos de los datos en <quote>modo cifrado</quote> no lo estuvieran---ya que el encabezado IP más externo debe estarlo para que el paquete sea enrutable.
MUST 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. El <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>) de Ueli Maurer mide rápidamente la entropía de una muestra. Utiliza un algoritmo de compresión. <link linkend="code">El código se proporciona a continuación</link> para una variante que mide partes sucesivas (~cuarto de megabyte) de un archivo

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