{"id":208,"date":"2014-12-17T21:24:16","date_gmt":"2014-12-17T21:24:16","guid":{"rendered":"https:\/\/hhardsoft.wordpress.com\/?p=208"},"modified":"2014-12-17T21:24:16","modified_gmt":"2014-12-17T21:24:16","slug":"encriptacion-y-firmado-de-documentos","status":"publish","type":"post","link":"https:\/\/hardsoftsecurity.es\/index.php\/2014\/12\/17\/encriptacion-y-firmado-de-documentos\/","title":{"rendered":"Encriptaci\u00f3n y firmado de documentos."},"content":{"rendered":"<p style=\"text-align:center;\"><strong>Encriptaci\u00f3n 2 parte pr\u00e1ctica AW 1415<\/strong><br \/>\n<strong> Realizado por<\/strong><br \/>\n<strong> David De Maya Merras.<\/strong><\/p>\n<p><strong>1.- Calcula el valor resumen de un documento utilizando el algoritmo MD5.<\/strong><\/p>\n<p><strong>a) Crea varios documentos de texto.\u2028<\/strong><\/p>\n<p>1)<\/p>\n<blockquote><p><a href=\"https:\/\/i0.wp.com\/hardsoftsecurity.es\/wp-content\/uploads\/2014\/12\/asc.png?ssl=1\"><img data-recalc-dims=\"1\" decoding=\"async\" data-attachment-id=\"209\" data-permalink=\"https:\/\/hardsoftsecurity.es\/index.php\/2014\/12\/17\/encriptacion-y-firmado-de-documentos\/asc\/\" data-orig-file=\"https:\/\/i0.wp.com\/hardsoftsecurity.es\/wp-content\/uploads\/2014\/12\/asc.png?fit=162%2C73&amp;ssl=1\" data-orig-size=\"162,73\" data-comments-opened=\"1\" data-image-title=\"asc\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/hardsoftsecurity.es\/wp-content\/uploads\/2014\/12\/asc.png?fit=162%2C73&amp;ssl=1\" class=\"aligncenter size-full wp-image-209\" src=\"https:\/\/i0.wp.com\/hardsoftsecurity.es\/wp-content\/uploads\/2014\/12\/asc.png?resize=162%2C73&#038;ssl=1\" alt=\"asc\" width=\"162\" height=\"73\" \/><\/a>Documentos creados con diferente nombre con el mismo contenido.<\/p>\n<p>2)<a href=\"https:\/\/i0.wp.com\/hardsoftsecurity.es\/wp-content\/uploads\/2014\/12\/asca.png?ssl=1\"><img data-recalc-dims=\"1\" decoding=\"async\" data-attachment-id=\"210\" data-permalink=\"https:\/\/hardsoftsecurity.es\/index.php\/2014\/12\/17\/encriptacion-y-firmado-de-documentos\/asca\/\" data-orig-file=\"https:\/\/i0.wp.com\/hardsoftsecurity.es\/wp-content\/uploads\/2014\/12\/asca.png?fit=162%2C72&amp;ssl=1\" data-orig-size=\"162,72\" data-comments-opened=\"1\" data-image-title=\"asca\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/hardsoftsecurity.es\/wp-content\/uploads\/2014\/12\/asca.png?fit=162%2C72&amp;ssl=1\" class=\"aligncenter size-full wp-image-210\" src=\"https:\/\/i0.wp.com\/hardsoftsecurity.es\/wp-content\/uploads\/2014\/12\/asca.png?resize=162%2C72&#038;ssl=1\" alt=\"asca\" width=\"162\" height=\"72\" \/><\/a><\/p>\n<p>Documentos creados con diferente nombre y diferente contenido.<\/p><\/blockquote>\n<p><!--more--><\/p>\n<p><strong>b) Calcula mediante la aplicaci\u00f3n sus valores hash.\u2028<\/strong><\/p>\n<p>1)<a href=\"https:\/\/i0.wp.com\/hardsoftsecurity.es\/wp-content\/uploads\/2014\/12\/weww.png?ssl=1\"><img data-recalc-dims=\"1\" decoding=\"async\" data-attachment-id=\"214\" data-permalink=\"https:\/\/hardsoftsecurity.es\/index.php\/2014\/12\/17\/encriptacion-y-firmado-de-documentos\/weww\/\" data-orig-file=\"https:\/\/i0.wp.com\/hardsoftsecurity.es\/wp-content\/uploads\/2014\/12\/weww.png?fit=562%2C85&amp;ssl=1\" data-orig-size=\"562,85\" data-comments-opened=\"1\" data-image-title=\"weww\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/hardsoftsecurity.es\/wp-content\/uploads\/2014\/12\/weww.png?fit=562%2C85&amp;ssl=1\" class=\"aligncenter size-full wp-image-214\" src=\"https:\/\/i0.wp.com\/hardsoftsecurity.es\/wp-content\/uploads\/2014\/12\/weww.png?resize=562%2C85&#038;ssl=1\" alt=\"weww\" width=\"562\" height=\"85\" srcset=\"https:\/\/i0.wp.com\/hardsoftsecurity.es\/wp-content\/uploads\/2014\/12\/weww.png?w=562&amp;ssl=1 562w, https:\/\/i0.wp.com\/hardsoftsecurity.es\/wp-content\/uploads\/2014\/12\/weww.png?resize=300%2C45&amp;ssl=1 300w\" sizes=\"(max-width: 562px) 100vw, 562px\" \/><\/a><\/p>\n<blockquote><p>Con diferente nombre pero con el mismo contenido, el hash que se nos muestra es el mismo en los dos casos.<\/p><\/blockquote>\n<p>2)<a href=\"https:\/\/i0.wp.com\/hardsoftsecurity.es\/wp-content\/uploads\/2014\/12\/wqwq.png?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"215\" data-permalink=\"https:\/\/hardsoftsecurity.es\/index.php\/2014\/12\/17\/encriptacion-y-firmado-de-documentos\/wqwq\/\" data-orig-file=\"https:\/\/i0.wp.com\/hardsoftsecurity.es\/wp-content\/uploads\/2014\/12\/wqwq.png?fit=558%2C68&amp;ssl=1\" data-orig-size=\"558,68\" data-comments-opened=\"1\" data-image-title=\"wqwq\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/hardsoftsecurity.es\/wp-content\/uploads\/2014\/12\/wqwq.png?fit=558%2C68&amp;ssl=1\" class=\"aligncenter size-full wp-image-215\" src=\"https:\/\/i0.wp.com\/hardsoftsecurity.es\/wp-content\/uploads\/2014\/12\/wqwq.png?resize=558%2C68&#038;ssl=1\" alt=\"wqwq\" width=\"558\" height=\"68\" srcset=\"https:\/\/i0.wp.com\/hardsoftsecurity.es\/wp-content\/uploads\/2014\/12\/wqwq.png?w=558&amp;ssl=1 558w, https:\/\/i0.wp.com\/hardsoftsecurity.es\/wp-content\/uploads\/2014\/12\/wqwq.png?resize=300%2C37&amp;ssl=1 300w\" sizes=\"(max-width: 558px) 100vw, 558px\" \/><\/a><\/p>\n<blockquote><p>Con diferente nombre y con diferente contenido, los hash generados son diferentes.<\/p><\/blockquote>\n<p><strong>c) \u00bfSon muy parecidos los valores resumen de los documentos?<\/strong><\/p>\n<p>1) En este caso los hash generados son iguales, y muy parecidos ya que tienen el mismo numero de caracteres.<br \/>\n2) En este caso los hash generados son diferentes debido a su contenido, y son parecidos ya que tienen el mismo n\u00famero de caracteres.<\/p>\n<p><strong>d) \u00bfC\u00f3mo son los valores hash obtenidos de dos documentos iguales que difieren exclusivamente en una letra?<\/strong><br \/>\nCreando dos documentos iguales que solo cambian en una letra.<\/p>\n<p><a href=\"https:\/\/i0.wp.com\/hardsoftsecurity.es\/wp-content\/uploads\/2014\/12\/qwqqqqq.png?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"212\" data-permalink=\"https:\/\/hardsoftsecurity.es\/index.php\/2014\/12\/17\/encriptacion-y-firmado-de-documentos\/qwqqqqq\/\" data-orig-file=\"https:\/\/i0.wp.com\/hardsoftsecurity.es\/wp-content\/uploads\/2014\/12\/qwqqqqq.png?fit=355%2C44&amp;ssl=1\" data-orig-size=\"355,44\" data-comments-opened=\"1\" data-image-title=\"qwqqqqq\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/hardsoftsecurity.es\/wp-content\/uploads\/2014\/12\/qwqqqqq.png?fit=355%2C44&amp;ssl=1\" class=\"aligncenter size-full wp-image-212\" src=\"https:\/\/i0.wp.com\/hardsoftsecurity.es\/wp-content\/uploads\/2014\/12\/qwqqqqq.png?resize=355%2C44&#038;ssl=1\" alt=\"qwqqqqq\" width=\"355\" height=\"44\" srcset=\"https:\/\/i0.wp.com\/hardsoftsecurity.es\/wp-content\/uploads\/2014\/12\/qwqqqqq.png?w=355&amp;ssl=1 355w, https:\/\/i0.wp.com\/hardsoftsecurity.es\/wp-content\/uploads\/2014\/12\/qwqqqqq.png?resize=300%2C37&amp;ssl=1 300w\" sizes=\"(max-width: 355px) 100vw, 355px\" \/><\/a><\/p>\n<p>Al obtener el hash de los dos documentos vemos claramente, que son completamente diferentes.<\/p>\n<p><a href=\"https:\/\/i0.wp.com\/hardsoftsecurity.es\/wp-content\/uploads\/2014\/12\/qweqqqqq.png?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"211\" data-permalink=\"https:\/\/hardsoftsecurity.es\/index.php\/2014\/12\/17\/encriptacion-y-firmado-de-documentos\/qweqqqqq\/\" data-orig-file=\"https:\/\/i0.wp.com\/hardsoftsecurity.es\/wp-content\/uploads\/2014\/12\/qweqqqqq.png?fit=499%2C69&amp;ssl=1\" data-orig-size=\"499,69\" data-comments-opened=\"1\" data-image-title=\"qweqqqqq\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/hardsoftsecurity.es\/wp-content\/uploads\/2014\/12\/qweqqqqq.png?fit=499%2C69&amp;ssl=1\" class=\"aligncenter size-full wp-image-211\" src=\"https:\/\/i0.wp.com\/hardsoftsecurity.es\/wp-content\/uploads\/2014\/12\/qweqqqqq.png?resize=499%2C69&#038;ssl=1\" alt=\"qweqqqqq\" width=\"499\" height=\"69\" srcset=\"https:\/\/i0.wp.com\/hardsoftsecurity.es\/wp-content\/uploads\/2014\/12\/qweqqqqq.png?w=499&amp;ssl=1 499w, https:\/\/i0.wp.com\/hardsoftsecurity.es\/wp-content\/uploads\/2014\/12\/qweqqqqq.png?resize=300%2C41&amp;ssl=1 300w\" sizes=\"(max-width: 499px) 100vw, 499px\" \/><\/a><\/p>\n<p><strong>2.- En muchas pa\u0301ginas web te puedes descargar adema\u0301s de un archivo su valor resumen para asi\u0301 comprobar si alguien ha modificado el archivo original y por tanto su valor no coincide con el que deberi\u0301a tener. Busca una donde se cumpla lo anterior y contesta con el enlace a esta.<\/strong><br \/>\nNos descargamos este archivo <a href=\"https:\/\/www.python.org\/downloads\/release\/python-279\/\">https:\/\/www.python.org\/downloads\/release\/python-279\/<\/a><br \/>\nque tiene el siguiente hash 5eebcaa0030dc4061156d3429657fb83<br \/>\nAl comprobar si alguien lo modifico, sale el siguiente resultado:<\/p>\n<p><a href=\"https:\/\/i0.wp.com\/hardsoftsecurity.es\/wp-content\/uploads\/2014\/12\/qwqqqqqqqqqqqqqq.png?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"213\" data-permalink=\"https:\/\/hardsoftsecurity.es\/index.php\/2014\/12\/17\/encriptacion-y-firmado-de-documentos\/qwqqqqqqqqqqqqqq\/\" data-orig-file=\"https:\/\/i0.wp.com\/hardsoftsecurity.es\/wp-content\/uploads\/2014\/12\/qwqqqqqqqqqqqqqq.png?fit=610%2C103&amp;ssl=1\" data-orig-size=\"610,103\" data-comments-opened=\"1\" data-image-title=\"qwqqqqqqqqqqqqqq\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/hardsoftsecurity.es\/wp-content\/uploads\/2014\/12\/qwqqqqqqqqqqqqqq.png?fit=610%2C103&amp;ssl=1\" class=\"aligncenter size-full wp-image-213\" src=\"https:\/\/i0.wp.com\/hardsoftsecurity.es\/wp-content\/uploads\/2014\/12\/qwqqqqqqqqqqqqqq.png?resize=610%2C103&#038;ssl=1\" alt=\"qwqqqqqqqqqqqqqq\" width=\"610\" height=\"103\" srcset=\"https:\/\/i0.wp.com\/hardsoftsecurity.es\/wp-content\/uploads\/2014\/12\/qwqqqqqqqqqqqqqq.png?w=610&amp;ssl=1 610w, https:\/\/i0.wp.com\/hardsoftsecurity.es\/wp-content\/uploads\/2014\/12\/qwqqqqqqqqqqqqqq.png?resize=300%2C51&amp;ssl=1 300w\" sizes=\"(max-width: 610px) 100vw, 610px\" \/><\/a><\/p>\n<p>El resultado es que el archivo obtenido no ha sido modificado por nadie.<\/p>\n<p><strong>3.- En grupos de 4. Llegado a este punto cada uno de vosotros tiene una pareja de claves y las p\u00fablicas de 3 compa\u00f1eros. Se trata de que cada uno le env\u00ede al profesor un fichero de texto describiendo el regalo que desea a papa Noel para navidad, ESTE FICHERO IRA FIRMADO. El profesor tras recibir los ficheros los enviar\u00e1 aleatoriamente a los componentes del grupo para que averig\u00fcen qui\u00e9n los firma. El nombre del fichero no deber\u00e1 tener pista alguna sobre la identidad del firmante.<\/strong><\/p>\n<p>https:\/\/www.dropbox.com\/sh\/vr1vjqpezs9swle\/AAAspKEP7k1LPk9dKHKr0Yuka?dl=0<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Encriptaci\u00f3n 2 parte pr\u00e1ctica AW 1415 Realizado por David De Maya Merras. 1.- Calcula el valor resumen de un documento utilizando el algoritmo MD5. a) Crea varios documentos de texto.\u2028 &#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_hide_featured_image":false,"_jetpack_featured_image_duplicate_dismissed":0,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[7],"tags":[],"class_list":["post-208","post","type-post","status-publish","format-standard","hentry","category-seguridad-informatica"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - 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