{"id":13593,"date":"2020-11-13T13:33:06","date_gmt":"2020-11-13T11:33:06","guid":{"rendered":"https:\/\/www.lisot.com\/signar-i-xifrar-digitalment-un-correu-electronic-com-funciona-la-signatura-digital\/"},"modified":"2020-11-13T13:36:44","modified_gmt":"2020-11-13T11:36:44","slug":"signar-i-xifrar-digitalment-un-correu-electronic-com-funciona-la-signatura-digital","status":"publish","type":"post","link":"https:\/\/www.lisot.com\/ca\/signar-i-xifrar-digitalment-un-correu-electronic-com-funciona-la-signatura-digital\/","title":{"rendered":"Signar i xifrar digitalment un correu electr\u00f2nic: Com funciona la signatura digital?"},"content":{"rendered":"<h4>Per a poder xifrar digitalment un missatge \u00e9s necessari que el receptor del missatge disposi de la clau per a desxifrar el missatge.<\/h4>\n<p>El seu funcionament est\u00e0 basat en la seguretat. Perqu\u00e8 un certificat digital que xifra els missatges tingui validesa legal, ha d&#8217;estar certificat per una autoritat de certificaci\u00f3 acreditada per l&#8217;entitat p\u00fablica de certificaci\u00f3 del pa\u00eds corresponent. A Espanya \u00e9s CERES (Certificaci\u00f3 Espanyola \u2013 F\u00e0brica de Moneda i Timbre) qui s&#8217;encarrega de gestionar aquests certificats.<\/p>\n<p>Despr\u00e9s dels certificats digitals est\u00e0 l&#8217;est\u00e0ndard X.509 el qual es basa en un algorisme de criptologia asim\u00e8trica.<\/p>\n<h4>El proc\u00e9s de signar i xifrar digitalment un correu electr\u00f2nic es produeix en dos passos principals:<\/h4>\n<ul>\n<li>L&#8217;emissor signa i envia el seu missatge.<\/li>\n<li>El receptor verifica la signatura del missatge rebut<\/li>\n<\/ul>\n<h3>Com funciona la signatura digital?<\/h3>\n<h4>M\u00e9s detalladament aquests serien els passos que conformen l&#8217;enviament d&#8217;un missatge signat digitalment:<\/h4>\n<ol>\n<li>\n<h4><strong>L&#8217;emissor signa i envia el seu missatge signat.<\/strong><\/h4>\n<ul>\n<li>L&#8217;emissor (Juan) crea un missatge nou sense xifrar.<\/li>\n<li>L&#8217;emissor obt\u00e9 un resum del missatge aplicant un funci\u00f3 Hash (Message digest)<\/li>\n<li>L&#8217;emissor xifra el resum del missatge mitjan\u00e7ant la seva clau privada.<br \/>\n<img decoding=\"async\" class=\"img-marg aligncenter wp-image-13581 size-full\" src=\"https:\/\/www.lisot.com\/wp-content\/uploads\/2020\/11\/como-firmar-digitalmente-documento-1.png\" alt=\"Signar digitalment i enviar un email\" width=\"425\" height=\"254\" srcset=\"https:\/\/www.lisot.com\/wp-content\/uploads\/2020\/11\/como-firmar-digitalmente-documento-1-200x120.png 200w, https:\/\/www.lisot.com\/wp-content\/uploads\/2020\/11\/como-firmar-digitalmente-documento-1-300x179.png 300w, https:\/\/www.lisot.com\/wp-content\/uploads\/2020\/11\/como-firmar-digitalmente-documento-1-400x239.png 400w, https:\/\/www.lisot.com\/wp-content\/uploads\/2020\/11\/como-firmar-digitalmente-documento-1.png 425w\" sizes=\"(max-width: 425px) 100vw, 425px\" \/><\/li>\n<li>L&#8217;emissor (Juan) envia al receptor (Pepe) el seu correu electr\u00f2nic signat i xitratge perqu\u00e8 el contingut del mateix nom\u00e9s pugui ser obert i llegit pel destinatari (Pepe)<img decoding=\"async\" class=\"img-marg aligncenter wp-image-13583 size-full\" src=\"https:\/\/www.lisot.com\/wp-content\/uploads\/2020\/11\/como-firmar-digitalmente-documento-2.png\" alt=\"Signar digitalment i enviar un email\" width=\"421\" height=\"258\" srcset=\"https:\/\/www.lisot.com\/wp-content\/uploads\/2020\/11\/como-firmar-digitalmente-documento-2-200x123.png 200w, https:\/\/www.lisot.com\/wp-content\/uploads\/2020\/11\/como-firmar-digitalmente-documento-2-300x184.png 300w, https:\/\/www.lisot.com\/wp-content\/uploads\/2020\/11\/como-firmar-digitalmente-documento-2-400x245.png 400w, https:\/\/www.lisot.com\/wp-content\/uploads\/2020\/11\/como-firmar-digitalmente-documento-2.png 421w\" sizes=\"(max-width: 421px) 100vw, 421px\" \/><\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<ol>\n<li>\n<h4><strong>El receptor verifica la signatura digital del missatge:<\/strong><\/h4>\n<\/li>\n<\/ol>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li>El receptor (Pepe) rep el correu electr\u00f2nic signat digitalment per Juan.<\/li>\n<li>El seg\u00fcent pas \u00e9s desxifrar el certificat digital de Juan mitjan\u00e7ant la clau p\u00fablica de l&#8217;entitat certificadora.<\/li>\n<li>Aquesta clau p\u00fablica normalment es troba en el magatzem de certificats de l&#8217;equip del client de correu.<\/li>\n<li>Una vegada desxifrat el certificat, Pepe pot accedir a la clau p\u00fablica de Juan i a les dades d&#8217;identificaci\u00f3 de Juan que cont\u00e9 el certificat.<\/li>\n<li>Pepe utilitza la clau p\u00fablica de Juan per a desxifrar el Resum del missatge xifrat creat per Juan.<\/li>\n<li>Si el contingut del missatge rebut ha estat xifrat per Juan, Pepe ha d&#8217;utilitzar la seva clau privada per a desxifrar el contingut del missatge.<img decoding=\"async\" class=\"img-marg aligncenter wp-image-13585 size-full\" src=\"https:\/\/www.lisot.com\/wp-content\/uploads\/2020\/11\/como-firmar-digitalmente-documento-3.png\" alt=\"Signar digitalment i enviar un email\" width=\"417\" height=\"115\" srcset=\"https:\/\/www.lisot.com\/wp-content\/uploads\/2020\/11\/como-firmar-digitalmente-documento-3-200x55.png 200w, https:\/\/www.lisot.com\/wp-content\/uploads\/2020\/11\/como-firmar-digitalmente-documento-3-300x83.png 300w, https:\/\/www.lisot.com\/wp-content\/uploads\/2020\/11\/como-firmar-digitalmente-documento-3-400x110.png 400w, https:\/\/www.lisot.com\/wp-content\/uploads\/2020\/11\/como-firmar-digitalmente-documento-3.png 417w\" sizes=\"(max-width: 417px) 100vw, 417px\" \/><\/li>\n<li>El receptor (Pepe) obt\u00e9 el seu propi resum del missatge usant la mateixa funci\u00f3 Hash que uso l&#8217;emissor (Juan) sobre el contingut del missatge sense xifrar.\n<ul>\n<li>Pepe compara el resum rebut de Juan amb el resum seu, i si tots dos s\u00f3n iguals significa el seg\u00fcent:<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li>El missatge ha arribat sense sofrir cap alteraci\u00f3 des que va ser enviat per Juan.<\/li>\n<li>El resum desxifrat per Pepe amb la clau p\u00fablica de Juan ha estat necess\u00e0riament xifrat per Juan amb la seva clau privada, per la qual cosa podem estar segurs que el missatge prov\u00e9 inequ\u00edvocament de Juan.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li style=\"list-style-type: none;\">\n<ul>\n<li>Si la comparaci\u00f3 del resum no coincideix, vol dir que el missatge ha estat alterat per tercers durant la transmissi\u00f3, o que el missatge ha estat signat per una altra persona.<img decoding=\"async\" class=\"img-marg aligncenter wp-image-13587 size-full\" src=\"https:\/\/www.lisot.com\/wp-content\/uploads\/2020\/11\/como-firmar-digitalmente-documento-4.png\" alt=\"Signar digitalment i enviar un email\" width=\"555\" height=\"350\" srcset=\"https:\/\/www.lisot.com\/wp-content\/uploads\/2020\/11\/como-firmar-digitalmente-documento-4-200x126.png 200w, https:\/\/www.lisot.com\/wp-content\/uploads\/2020\/11\/como-firmar-digitalmente-documento-4-300x189.png 300w, https:\/\/www.lisot.com\/wp-content\/uploads\/2020\/11\/como-firmar-digitalmente-documento-4-320x202.png 320w, https:\/\/www.lisot.com\/wp-content\/uploads\/2020\/11\/como-firmar-digitalmente-documento-4-400x252.png 400w, https:\/\/www.lisot.com\/wp-content\/uploads\/2020\/11\/como-firmar-digitalmente-documento-4.png 555w\" sizes=\"(max-width: 555px) 100vw, 555px\" \/><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>La implantaci\u00f3 d&#8217;un sistema de <strong>signat i xitratge digital de missatges<\/strong> \u00e9s un proc\u00e9s labori\u00f3s que des de <a href=\"https:\/\/www.lisot.com\/empresa-mantenimiento-informatico-barcelona\/\">LISOT Inform\u00e0tica empresarial en Barcelona<\/a> us podem ajudar a implantar.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Per a poder xifrar digitalment un missatge \u00e9s necessari que el receptor del missatge disposi de la clau per a desxifrar el missatge. El seu funcionament est\u00e0 basat en la seguretat. Perqu\u00e8 un certificat digital que xifra els missatges tingui validesa legal, ha d&#8217;estar certificat per una autoritat de certificaci\u00f3 acreditada per l&#8217;entitat p\u00fablica de certificaci\u00f3  [&#8230;]<\/p>\n","protected":false},"author":1,"featured_media":13588,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"categories":[70,93],"tags":[262,72,223,103,157,119,74,263],"class_list":["post-13593","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciberseguridad-ca","category-mantenimiento-informatico-ca","tag-certificat-digital","tag-ciberseguridad-ca","tag-correu-electronic","tag-manteniment-informatic","tag-manteniment-informatic-preventiu","tag-seguretat","tag-seguridad-informatica-ca","tag-signatura-digital"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Signar i xifrar digitalment un e-mail Com funciona la signatura 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