{"id":1545,"date":"2021-10-13T18:01:16","date_gmt":"2021-10-13T18:01:16","guid":{"rendered":"http:\/\/www.goncalo.pt\/por\/?p=1545"},"modified":"2023-10-07T03:03:10","modified_gmt":"2023-10-07T03:03:10","slug":"2021-10-13-knowledge-tester-ja-com-encriptacao-rijndael-256-e-outras-novidades","status":"publish","type":"post","link":"https:\/\/www.goncalo.pt\/por\/2021\/10\/13\/2021-10-13-knowledge-tester-ja-com-encriptacao-rijndael-256-e-outras-novidades\/","title":{"rendered":"2021-10-13 &#8211; Knowledge Tester j\u00e1 com encripta\u00e7\u00e3o Rijndael 256, e outras novidades&#8230;"},"content":{"rendered":"\n<p>Encripta\u00e7\u00e3o j\u00e1 adicionada ao Knowledge Tester, al\u00e9m de outras coisas (clicar acima para ver a imagem).<\/p>\n\n\n\n<p>Adicionei encripta\u00e7\u00e3o, com base no algoritmo Rijndael 256 (AES256), com um pequeno add-on que adicionei (que era at\u00e9 escusado dado que ningu\u00e9m iria crackar o AES256 \u00e0 for\u00e7a, mas mesmo assim adicionei algo mais).<\/p>\n\n\n\n<p>E uso um sistema de duas passwords, o criador do exame gera uma password, tipo &#8220;exame 1&#8221;, mas para evitar que os alunos\/formandos testem o &#8220;exame 2&#8221; no pr\u00f3ximo exame, o que lhes \u00e9 dado \u00e9 uma hash criptogr\u00e1fica gerada com o algoritmo SHA2 (representada acima na forma de caracteres leg\u00edveis, mais longa que a de 32 caracteres), que \u00e9 a que os alunos usar\u00e3o para abrir o exame.<\/p>\n\n\n\n<p>Essa hash tem obviamente um salt para evitar ataques por rainbow tables (at\u00e9 parece que estamos a falar de alunos de Mestrado em Cyber-Security e\/ou hashes quebradas como MD5 e afins, sei que parece exagerado mas pronto, meti).<\/p>\n\n\n\n<p>Assim o aluno tem uma password que lhe permite abrir o exame, mas n\u00e3o permitir\u00e1 que leia o relat\u00f3rio do exame, nem tentar achar a password original (neste caso &#8220;testes&#8221;), atrav\u00e9s de rainbow tables ou outras coisas do g\u00e9nero.<\/p>\n\n\n\n<p>AES256 + algo para encriptar, e depois uma SHA2 para criar uma password extra para o aluno abrir o exame.<\/p>\n\n\n\n<p>Quem conhecer o algoritmo Rijndael saber\u00e1 porque o &#8220;.txt.kt&#8221; (encriptado) tem aqueles bytes a mais de tamanho no ficheiro\u2026<\/p>\n\n\n\n<p>Pode-se literalmente dar o exame ao aluno 1 ano antes e dizer &#8220;tens aqui um ano para crackar isto e teres as perguntas do exame&#8221;, que ele n\u00e3o vai conseguir. \ud83d\ude1b<\/p>\n\n\n\n<p>O formador pode desencriptar com a chave original o exame, e encriptar novamente, e tamb\u00e9m os relat\u00f3rios, etc.<\/p>\n\n\n\n<p>J\u00e1 foram criadas pequenas m\u00e1quinas virtuais de Linuxs com 64MB de mem\u00f3ria e 500 (as com interface gr\u00e1fica), para ser f\u00e1cil praticar com o software em qualquer lado atrav\u00e9s de por exemplo Virtual Box.<\/p>\n\n\n\n<p>J\u00e1 foram criadas configura\u00e7\u00f5es (uma sec\u00e7\u00e3o do ficheiro) que ter\u00e1 protec\u00e7\u00f5es, que permitir\u00e3o ao aluno correr apenas uma \u00fanica vez o ficheiro, e outras protec\u00e7\u00f5es.<\/p>\n\n\n\n<p>Futuras melhorias:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Gera\u00e7\u00e3o de passwords que s\u00f3 funcionam em determinadas horas, para evitar que o aluno corra noutra hora (repita depois) com a mesma password;<\/li><li>Protec\u00e7\u00e3o para o ficheiro ser iniciado uma \u00fanica vez a ser melhorada;<\/li><li>Laborat\u00f3rios de comandos para aceitar comandos com linhas a mais e a menos;<\/li><li>Gerar um relat\u00f3rio extra s\u00f3 com as perguntas falhadas para o formador analisar bem quais poderiam estar certas se n\u00e3o fossem typing errors;<\/li><li>Talvez memorizar as perguntas falhadas dentro do pr\u00f3prio ficheiro, um top das mais falhadas, para ser invocado facilmente (apesar de ele j\u00e1 repetir as falhadas em modo de teste).<\/li><li>Entre v\u00e1rias outras coisas.<\/li><\/ul>\n\n\n\n<p>Mas de momento, est\u00e1 pronto a ser usado para exames com toda a seguran\u00e7a.<\/p>\n\n\n\n<p>Mais novidades depois, mas mais uma ou duas semanas, e dou-o como terminado (vers\u00e3o 1) e s\u00f3 o retomarei para 2022, para ver se desenvolvo jogos este ano ainda. \ud83d\ude42<\/p>\n\n\n\n<p>2021-10-13.<\/p>\n\n\n\n<p>Partilhado no LinkedIn em 2021-10-13, em:<\/p>\n\n\n\n<p><a href=\"https:\/\/www.linkedin.com\/feed\/update\/urn:li:activity:6854115182436777985\/\">https:\/\/www.linkedin.com\/feed\/update\/urn:li:activity:6854115182436777985\/<\/a><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"http:\/\/www.goncalo.pt\/por\/wp-content\/uploads\/2021\/10\/2021-10-13-FIM-DO-DIA-20211013_184635-Screenshot_20211013_184635-1024x576.png\" alt=\"2021-10-13 - Knowledge Tester j\u00e1 com encripta\u00e7\u00e3o Rijndael 256, e outras novidades...\" class=\"wp-image-1546\" srcset=\"https:\/\/www.goncalo.pt\/por\/wp-content\/uploads\/2021\/10\/2021-10-13-FIM-DO-DIA-20211013_184635-Screenshot_20211013_184635-1024x576.png?v=1634148143 1024w, https:\/\/www.goncalo.pt\/por\/wp-content\/uploads\/2021\/10\/2021-10-13-FIM-DO-DIA-20211013_184635-Screenshot_20211013_184635-300x169.png?v=1634148143 300w, https:\/\/www.goncalo.pt\/por\/wp-content\/uploads\/2021\/10\/2021-10-13-FIM-DO-DIA-20211013_184635-Screenshot_20211013_184635-768x432.png?v=1634148143 768w, https:\/\/www.goncalo.pt\/por\/wp-content\/uploads\/2021\/10\/2021-10-13-FIM-DO-DIA-20211013_184635-Screenshot_20211013_184635-1536x864.png?v=1634148143 1536w, https:\/\/www.goncalo.pt\/por\/wp-content\/uploads\/2021\/10\/2021-10-13-FIM-DO-DIA-20211013_184635-Screenshot_20211013_184635.png?v=1634148143 1920w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption>2021-10-13 &#8211; Knowledge Tester j\u00e1 com encripta\u00e7\u00e3o Rijndael 256, e outras novidades&#8230;<\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Encripta\u00e7\u00e3o j\u00e1 adicionada ao Knowledge Tester, al\u00e9m de outras coisas (clicar acima para ver a imagem). Adicionei encripta\u00e7\u00e3o, com base<\/p>\n","protected":false},"author":1,"featured_media":1546,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[198,197,5,3,4],"tags":[204,7,207,203,8,9,10,11,120],"class_list":["post-1545","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-formacao","category-linux","category-programacao","category-projectos","category-softwares","tag-aprendizagem","tag-c","tag-dev","tag-ensino","tag-formacao","tag-knowledge-tester","tag-linux","tag-linux-helper","tag-programacao"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>2021-10-13 - Knowledge Tester j\u00e1 com encripta\u00e7\u00e3o Rijndael 256, e outras novidades... - Gon\u00e7alo Ferreira<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.goncalo.pt\/por\/2021\/10\/13\/2021-10-13-knowledge-tester-ja-com-encriptacao-rijndael-256-e-outras-novidades\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"2021-10-13 - Knowledge Tester j\u00e1 com encripta\u00e7\u00e3o Rijndael 256, e outras novidades... - Gon\u00e7alo Ferreira\" \/>\n<meta property=\"og:description\" content=\"Encripta\u00e7\u00e3o j\u00e1 adicionada ao Knowledge Tester, al\u00e9m de outras coisas (clicar acima para ver a imagem). 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