{"id":1107,"date":"2019-05-07T11:55:52","date_gmt":"2019-05-07T10:55:52","guid":{"rendered":"http:\/\/domagoj-sajter.from.hr\/?p=1107"},"modified":"2019-06-27T07:40:11","modified_gmt":"2019-06-27T06:40:11","slug":"enkripcija-naknadno-dokazivanje-znanja","status":"publish","type":"post","link":"http:\/\/domagoj-sajter.from.hr\/?p=1107","title":{"rendered":"Enkripcija i naknadno dokazivanje znanja"},"content":{"rendered":"

Algoritmi enkripcije omogu\u0107uju ne\u0161to interesantno: mo\u017eete naknadno dokazati da ste ne\u0161to znali i prije nego se to ne\u0161to dogodilo, odnosno mo\u017eete za\u0161tititi svoje znanje.<\/p>\n

<\/p>\n

(Obratite pa\u017enju na datume.)<\/p>\n

Naprimjer, na dan 7. 5.<\/strong> 2019. u 12:00h na Internetu objavite sljede\u0107i hash<\/em> (“enkripciju”):
\nA96796EB65552F41CFDFEA263490733EF919FE33F3F3586FD81EA4E23A7BDB8C654E124EF739127A6E5B61735D80A9ED99D436617348090A94ED2661E369C710<\/strong><\/p>\n

Naknadno, na dan 21. 5.<\/strong> 2019. na Internetu objavite sljede\u0107i tekst:
\nUtakmica izme\u0111u NK \u0160erifa iz Zagreba i NK Magarca koja je zakazana za 17<\/strong>. 5. 2019. u 17:00h u Pi\u0161korevcima je namje\u0161tena. Dogovoren je rezultat 2:1 za doma\u0107ina. Golove za NK \u0160erif dat \u0107e Pero Peri\u0107 u prvom poluvremenu i Ivo Ivi\u0107 u drugom. Gol za NK Magarac dat \u0107e Filip Filip\u010di\u0107 u prvom poluvremenu iz kaznenog udarca s 11 metara, a prekr\u0161aj za taj kazneni udarac napravit \u0107e golman Zdenko Zden\u010di\u0107 na Ronaldu Ronaldi\u0107u. Sve sam to znao unaprijed, a kao dokaz da sam to znao javno sam na Internetu objavio SHA512 enkripciju ovih informacija deset dana prije utakmice, na dan 7. 5. 2019. u 12:00h.<\/em><\/p>\n

Kad od gornjeg teksta (u italiku<\/em>), objavljenog 21. 5. 2019, napravite SHA512 hash, npr. na stranici https:\/\/passwordsgenerator.net\/sha512-hash-generator\/<\/a>, (ili ovdje<\/a>, ili ovdje<\/a>) dobijete to\u010dno isti hash kojeg ste ve\u0107 objavili 14 dana prije<\/strong>:
\nA96796EB65552F41CFDFEA263490733EF919FE33F3F3586FD81EA4E23A7BDB8C654E124EF739127A6E5B61735D80A9ED99D436617348090A94ED2661E369C710<\/p>\n

Naime, enkripcijski algoritmi djeluju tako da od bilo kojeg sadr\u017eaja, npr. teksta naprave hash<\/em> – jedinstveni digitalni identifikator toga sadr\u017eaja. Samo to\u010dno odre\u0111eni sadr\u017eaj mo\u017ee napraviti hash <\/em>i prakti\u010dno je nemogu\u0107e da dva razli\u010dita sadr\u017eaja (teksta) daju isti hash<\/em>. Kad netko objavi A96796EB65552F41CFDFEA263490733EF919FE33F3F3586FD81EA4E23A7BDB8C654E124EF739127A6E5B61735D80A9ED99D436617348090A94ED2661E369C710 nitko ne mo\u017ee znati \u0161to se “krije” ispod tog hasha, samo onaj tko ga je producirao. Ako on naknadno objavi tekst koji je producirao gornji hash<\/em>, dokazuje da je imao tu informaciju unaprijed.<\/p>\n

Na ovaj na\u010din nakon utakmice (tj. nakon bilo kojeg doga\u0111aja) mo\u017eete dokazati da ste unaprijed znali \u0161to \u0107e se dogoditi. Mo\u017eete za\u0161tititi svoje znanje i naknadno, po potrebi, objaviti sadr\u017eaj informacije koja je producirala odre\u0111eni hash<\/em>.<\/p>\n","protected":false},"excerpt":{"rendered":"

Algoritmi enkripcije omogu\u0107uju ne\u0161to interesantno: mo\u017eete naknadno dokazati da ste ne\u0161to znali i prije nego se to ne\u0161to dogodilo, odnosno mo\u017eete za\u0161tititi svoje znanje.<\/p>\n","protected":false},"author":171,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0},"categories":[1],"tags":[1333,1335,1336],"yoast_head":"\nEnkripcija i naknadno dokazivanje znanja - Domagoj Sajter<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/domagoj-sajter.from.hr\/?p=1107\" \/>\n<meta property=\"og:locale\" content=\"hr_HR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Enkripcija i naknadno dokazivanje znanja - Domagoj Sajter\" \/>\n<meta property=\"og:description\" content=\"Algoritmi enkripcije omogu\u0107uju ne\u0161to interesantno: mo\u017eete naknadno dokazati da ste ne\u0161to znali i prije nego se to ne\u0161to dogodilo, odnosno mo\u017eete za\u0161tititi svoje znanje.\" \/>\n<meta property=\"og:url\" content=\"http:\/\/domagoj-sajter.from.hr\/?p=1107\" \/>\n<meta property=\"og:site_name\" content=\"Domagoj Sajter\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/financije.1\" \/>\n<meta property=\"article:published_time\" content=\"2019-05-07T10:55:52+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2019-06-27T06:40:11+00:00\" \/>\n<meta name=\"twitter:card\" content=\"summary\" \/>\n<meta name=\"twitter:label1\" content=\"Napisao\/la\" \/>\n\t<meta name=\"twitter:data1\" content=\"Domagoj Sajter\" \/>\n\t<meta name=\"twitter:label2\" content=\"Procijenjeno vrijeme \u010ditanja\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebSite\",\"@id\":\"https:\/\/domagoj-sajter.from.hr\/#website\",\"url\":\"https:\/\/domagoj-sajter.from.hr\/\",\"name\":\"Domagoj Sajter\",\"description\":\"osobne stranice\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/domagoj-sajter.from.hr\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"hr\"},{\"@type\":\"WebPage\",\"@id\":\"http:\/\/domagoj-sajter.from.hr\/?p=1107#webpage\",\"url\":\"http:\/\/domagoj-sajter.from.hr\/?p=1107\",\"name\":\"Enkripcija i naknadno dokazivanje znanja - Domagoj Sajter\",\"isPartOf\":{\"@id\":\"https:\/\/domagoj-sajter.from.hr\/#website\"},\"datePublished\":\"2019-05-07T10:55:52+00:00\",\"dateModified\":\"2019-06-27T06:40:11+00:00\",\"author\":{\"@id\":\"https:\/\/domagoj-sajter.from.hr\/#\/schema\/person\/d4fdfbe69949cfe84f1166af6396b800\"},\"breadcrumb\":{\"@id\":\"http:\/\/domagoj-sajter.from.hr\/?p=1107#breadcrumb\"},\"inLanguage\":\"hr\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"http:\/\/domagoj-sajter.from.hr\/?p=1107\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"http:\/\/domagoj-sajter.from.hr\/?p=1107#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/domagoj-sajter.from.hr\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Enkripcija i naknadno dokazivanje znanja\"}]},{\"@type\":\"Person\",\"@id\":\"https:\/\/domagoj-sajter.from.hr\/#\/schema\/person\/d4fdfbe69949cfe84f1166af6396b800\",\"name\":\"Domagoj Sajter\",\"image\":{\"@type\":\"ImageObject\",\"@id\":\"https:\/\/domagoj-sajter.from.hr\/#personlogo\",\"inLanguage\":\"hr\",\"url\":\"http:\/\/1.gravatar.com\/avatar\/d77b3a3c73438d362255d004235ba492?s=96&d=monsterid&r=g\",\"contentUrl\":\"http:\/\/1.gravatar.com\/avatar\/d77b3a3c73438d362255d004235ba492?s=96&d=monsterid&r=g\",\"caption\":\"Domagoj Sajter\"},\"sameAs\":[\"http:\/\/domagoj-sajter.from.hr\"],\"url\":\"http:\/\/domagoj-sajter.from.hr\/?author=171\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Enkripcija i naknadno dokazivanje znanja - Domagoj Sajter","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"http:\/\/domagoj-sajter.from.hr\/?p=1107","og_locale":"hr_HR","og_type":"article","og_title":"Enkripcija i naknadno dokazivanje znanja - Domagoj Sajter","og_description":"Algoritmi enkripcije omogu\u0107uju ne\u0161to interesantno: mo\u017eete naknadno dokazati da ste ne\u0161to znali i prije nego se to ne\u0161to dogodilo, odnosno mo\u017eete za\u0161tititi svoje znanje.","og_url":"http:\/\/domagoj-sajter.from.hr\/?p=1107","og_site_name":"Domagoj Sajter","article_publisher":"https:\/\/www.facebook.com\/financije.1","article_published_time":"2019-05-07T10:55:52+00:00","article_modified_time":"2019-06-27T06:40:11+00:00","twitter_card":"summary","twitter_misc":{"Napisao\/la":"Domagoj Sajter","Procijenjeno vrijeme \u010ditanja":"2 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebSite","@id":"https:\/\/domagoj-sajter.from.hr\/#website","url":"https:\/\/domagoj-sajter.from.hr\/","name":"Domagoj Sajter","description":"osobne stranice","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/domagoj-sajter.from.hr\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"hr"},{"@type":"WebPage","@id":"http:\/\/domagoj-sajter.from.hr\/?p=1107#webpage","url":"http:\/\/domagoj-sajter.from.hr\/?p=1107","name":"Enkripcija i naknadno dokazivanje znanja - Domagoj Sajter","isPartOf":{"@id":"https:\/\/domagoj-sajter.from.hr\/#website"},"datePublished":"2019-05-07T10:55:52+00:00","dateModified":"2019-06-27T06:40:11+00:00","author":{"@id":"https:\/\/domagoj-sajter.from.hr\/#\/schema\/person\/d4fdfbe69949cfe84f1166af6396b800"},"breadcrumb":{"@id":"http:\/\/domagoj-sajter.from.hr\/?p=1107#breadcrumb"},"inLanguage":"hr","potentialAction":[{"@type":"ReadAction","target":["http:\/\/domagoj-sajter.from.hr\/?p=1107"]}]},{"@type":"BreadcrumbList","@id":"http:\/\/domagoj-sajter.from.hr\/?p=1107#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/domagoj-sajter.from.hr\/"},{"@type":"ListItem","position":2,"name":"Enkripcija i naknadno dokazivanje znanja"}]},{"@type":"Person","@id":"https:\/\/domagoj-sajter.from.hr\/#\/schema\/person\/d4fdfbe69949cfe84f1166af6396b800","name":"Domagoj Sajter","image":{"@type":"ImageObject","@id":"https:\/\/domagoj-sajter.from.hr\/#personlogo","inLanguage":"hr","url":"http:\/\/1.gravatar.com\/avatar\/d77b3a3c73438d362255d004235ba492?s=96&d=monsterid&r=g","contentUrl":"http:\/\/1.gravatar.com\/avatar\/d77b3a3c73438d362255d004235ba492?s=96&d=monsterid&r=g","caption":"Domagoj Sajter"},"sameAs":["http:\/\/domagoj-sajter.from.hr"],"url":"http:\/\/domagoj-sajter.from.hr\/?author=171"}]}},"_links":{"self":[{"href":"http:\/\/domagoj-sajter.from.hr\/index.php?rest_route=\/wp\/v2\/posts\/1107"}],"collection":[{"href":"http:\/\/domagoj-sajter.from.hr\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/domagoj-sajter.from.hr\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/domagoj-sajter.from.hr\/index.php?rest_route=\/wp\/v2\/users\/171"}],"replies":[{"embeddable":true,"href":"http:\/\/domagoj-sajter.from.hr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1107"}],"version-history":[{"count":5,"href":"http:\/\/domagoj-sajter.from.hr\/index.php?rest_route=\/wp\/v2\/posts\/1107\/revisions"}],"predecessor-version":[{"id":1116,"href":"http:\/\/domagoj-sajter.from.hr\/index.php?rest_route=\/wp\/v2\/posts\/1107\/revisions\/1116"}],"wp:attachment":[{"href":"http:\/\/domagoj-sajter.from.hr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1107"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/domagoj-sajter.from.hr\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1107"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/domagoj-sajter.from.hr\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1107"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}