{"id":10459,"date":"2024-11-27T09:16:43","date_gmt":"2024-11-27T08:16:43","guid":{"rendered":"https:\/\/web3factory.net\/pt-pt\/posts\/"},"modified":"2025-02-14T16:31:51","modified_gmt":"2025-02-14T15:31:51","slug":"o-hashing","status":"publish","type":"post","link":"https:\/\/web3factory.net\/pt-pt\/posts\/o-hashing\/","title":{"rendered":"O hashing"},"content":{"rendered":"<span class=\"simplefavorite-button\" data-postid=\"10459\" data-siteid=\"1\" data-groupid=\"1\" data-favoritecount=\"0\" style=\"box-shadow:none;-webkit-box-shadow:none;-moz-box-shadow:none;\"><label class=\"favoritebtn\"><i aria-hidden=\"true\" class=\"fas fa-bookmark favoritesize\"><\/i><span class=\"elementor-icon-list-text elementor-post-info__item elementor-post-info__item--type-custom\">\u200e\u200e \u200e \u200e Adicionar \u00e0 minha lista \u200e \u200e <\/span><\/label><\/span>\n<p>Hashings desempenham um papel fundamental na seguran\u00e7a de transa\u00e7\u00f5es cripto. Se voc\u00ea \u00e9 o menos curioso, voc\u00ea pode j\u00e1 ter notado estes famosos hashes de transa\u00e7\u00e3o ou bloqueios enquanto navega na Web3. Talvez voc\u00ea tenha lido em algum lugar, sem muita explica\u00e7\u00e3o, que eles s\u00e3o o que torna poss\u00edvel proteger uma grande parte dos v\u00e1rios blockchains em uso hoje.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-o-que-significa-hash\">O que significa <span tabindex='0' class='glossary-item-container'>hash<span class='glossary-item-hidden-content'><span class='glossary-item-header'>Hash<\/span> <span class='glossary-item-description'>Uma fun\u00e7\u00e3o criptogr\u00e1fica que converte dados de entrada em uma cadeia alfanum\u00e9rica de tamanho fixo.<\/span><\/span><\/span>?<\/h2>\n\n\n\n<p>What we call \u2018<strong>hashing<\/strong>\u2018 simply defines a mathematical function or algorithm which takes as input a certain type of data (a sentence, an entire book, transaction data) and returns as output a sequence of characters of a fixed length.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"611\" height=\"223\" src=\"https:\/\/web3factory.net\/wp-content\/uploads\/2024\/11\/image-10.png\" alt=\"\" class=\"wp-image-10460\" srcset=\"https:\/\/web3factory.net\/wp-content\/uploads\/2024\/11\/image-10.png 611w, https:\/\/web3factory.net\/wp-content\/uploads\/2024\/11\/image-10-300x109.png 300w\" sizes=\"(max-width: 611px) 100vw, 611px\" \/><\/figure><\/div>\n\n\n<p>O principal objetivo das fun\u00e7\u00f5es de hash \u00e9 garantir a transfer\u00eancia de dados ou informa\u00e7\u00f5es entre dois sistemas que, por padr\u00e3o, n\u00e3o t\u00eam meios para garantir a seguran\u00e7a da troca. Existem muitos algoritmos de hash diferentes, e o algoritmo de hash <strong>SHA-256<\/strong>, por exemplo, \u00e9 particularmente conhecido por seu uso na <span tabindex='0' class='glossary-item-container'>blockchain<span class='glossary-item-hidden-content'><span class='glossary-item-header'>Blockchain<\/span> <span class='glossary-item-description'>Um livro-raz\u00e3o p\u00fablico e imut\u00e1vel de transa\u00e7\u00f5es criptogr\u00e1ficas, organizado em blocos.<\/span><\/span><\/span> do <strong>Bitcoin <\/strong>para garantir a seguran\u00e7a total das transa\u00e7\u00f5es e trocas.<br>A particularidade do hash \u00e9, em primeiro lugar, o seu princ\u00edpio de irreversibilidade: um algoritmo de hash pode tomar os dados recebidos e convert\u00ea-los em um hash, mas um hash n\u00e3o pode revelar os dados utilizados em primeiro lugar.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-um-exemplo-de-hashing\">Um exemplo de hashing<\/h2>\n\n\n\n<p><br>Para entender melhor como o hash protege as trocas, vamos dar um exemplo simples<br>Imaginemos que dois indiv\u00edduos, Sam e Caroline, trocam uma mensagem contendo informa\u00e7\u00f5es cruciais que desejam proteger contra modifica\u00e7\u00e3o ou intercepta\u00e7\u00e3o por terceiros.<\/p>\n\n\n\n<p>Depois de receber a mensagem, Sam poderia fornecer a Caroline o hash, e se Caroline conseguir encontrar o mesmo hash na mensagem recebida, isso significa que eles receberam a mesma mensagem e que ela n\u00e3o foi alterada.<\/p>\n\n\n\n<p>Ou ainda mais simples, como medida de seguran\u00e7a, o hash \u00e9 usado por sites para armazenar sua senha. Imagine que voc\u00ea cria uma conta em um site. Em vez de armazenar a sua senha como ela \u00e9 (por exemplo: &#8220;123456&#8221;), o site aplica uma fun\u00e7\u00e3o de hash que transforma essa senha em uma sequ\u00eancia de caracteres como:<\/p>\n\n\n\n<p class=\"has-text-align-center\"><strong>e10adc3949ba59abbe56e057f20f883e<\/strong><\/p>\n\n\n\n<p>Se algu\u00e9m roubar o banco de dados, eles n\u00e3o ser\u00e3o capazes de usar suas senhas diretamente. Este m\u00e9todo \u00e9 essencial para reduzir os riscos em caso de um ataque cibern\u00e9tico, e quando voc\u00ea deseja fazer login, aplicamos a fun\u00e7\u00e3o de hash \u00e0 senha fornecida e comparamos os dois hashes se eles forem semelhantes &#8211; voc\u00ea digitou a senha correta.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-o-que-dizer-sobre-blockchain\">O que dizer sobre blockchain?<\/h3>\n\n\n\n<p>Agora que entendemos como o hash protege as trocas, vamos ver como ele \u00e9 usado para garantir a seguran\u00e7a e integridade de blockchains. Irreversibilidade e anonimiza\u00e7\u00e3o s\u00e3o tudo bem! Mas onde n\u00f3s realmente usamos isso quando lidamos com uma blockchain como o Bitcoin?<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-criando-e-vinculando-blocos\">Criando e vinculando blocos<\/h3>\n\n\n\n<p>Cada bloco de uma blockchain cont\u00e9m um conjunto de transa\u00e7\u00f5es. Para garantir que esses blocos sejam seguros e estejam vinculados de forma imut\u00e1vel, cada bloco inclui um hash exclusivo calculado a partir dos dados que cont\u00e9m, bem como o hash do bloco anterior. Esta estrutura de cadeia garante que se algu\u00e9m alterar os dados em um bloco, o hash desse bloco tamb\u00e9m muda. Como resultado, todos os blocos subsequentes seriam afetados, tornando qualquer tentativa de adultera\u00e7\u00e3o rapidamente identific\u00e1vel.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img decoding=\"async\" width=\"620\" height=\"300\" src=\"https:\/\/web3factory.net\/wp-content\/uploads\/2024\/11\/image-11.png\" alt=\"\" class=\"wp-image-10464\" srcset=\"https:\/\/web3factory.net\/wp-content\/uploads\/2024\/11\/image-11.png 620w, https:\/\/web3factory.net\/wp-content\/uploads\/2024\/11\/image-11-300x145.png 300w\" sizes=\"(max-width: 620px) 100vw, 620px\" \/><\/figure><\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"h-validacao-de-transacao\">Valida\u00e7\u00e3o de transa\u00e7\u00e3o<\/h3>\n\n\n\n<p>Os mineradores na blockchain usam fun\u00e7\u00f5es de hash para validar transa\u00e7\u00f5es e criar novos blocos. Durante o processo de minera\u00e7\u00e3o, um minerador deve encontrar um n\u00famero especial, chamado nonce, que, quando combinado com os dados do bloco e passado atrav\u00e9s da fun\u00e7\u00e3o de hash (como SHA-256), produz um hash que atende a certas condi\u00e7\u00f5es pr\u00e9-definidas (um n\u00famero de zeros no in\u00edcio, por exemplo).<br>Este processo est\u00e1 no cora\u00e7\u00e3o do mecanismo de consenso conhecido como Prova de Trabalho (<strong>PoW<\/strong>). O hashing torna a minera\u00e7\u00e3o dif\u00edcil e intensiva em recursos, protegendo a rede contra ataques e garantindo a integridade e a ordem das transa\u00e7\u00f5es.<\/p>\n\n\n\n<p>Gra\u00e7as \u00e0 irreversibilidade das fun\u00e7\u00f5es de hash, uma vez que uma transa\u00e7\u00e3o foi inclu\u00edda em um bloco e validada pela rede, \u00e9 praticamente imposs\u00edvel modific\u00e1-la. Qualquer tentativa de modific\u00e1-lo exigiria recalcular o hash desse bloco e todos os blocos subsequentes, uma tarefa que seria quase imposs\u00edvel de realizar, pois exigiria poder computacional colossal al\u00e9m do resto da rede.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img decoding=\"async\" width=\"886\" height=\"454\" src=\"https:\/\/web3factory.net\/wp-content\/uploads\/2024\/11\/image-12.png\" alt=\"\" class=\"wp-image-10468\" style=\"width:626px;height:auto\" srcset=\"https:\/\/web3factory.net\/wp-content\/uploads\/2024\/11\/image-12.png 886w, https:\/\/web3factory.net\/wp-content\/uploads\/2024\/11\/image-12-300x154.png 300w, https:\/\/web3factory.net\/wp-content\/uploads\/2024\/11\/image-12-768x394.png 768w\" sizes=\"(max-width: 886px) 100vw, 886px\" \/><\/figure><\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"h-proof-of-work-e-sha-256\"><span tabindex='0' class='glossary-item-container'>Proof of work<span class='glossary-item-hidden-content'><span class='glossary-item-header'>Proof of Work<\/span> <span class='glossary-item-description'>Um mecanismo de consenso em que os mineradores competem para resolver problemas matem\u00e1ticos complexos para validar transa\u00e7\u00f5es e proteger a rede.<\/span><\/span><\/span> e sha-256<\/h3>\n\n\n\n<p>Bitcoin, por exemplo, usa a fun\u00e7\u00e3o de hash SHA-256 para minera\u00e7\u00e3o. Esta fun\u00e7\u00e3o garante que cada entrada produz um hash de comprimento fixo, e que uma pequena mudan\u00e7a na entrada resulta em um hash completamente diferente. Isso \u00e9 o que torna a blockchain t\u00e3o confi\u00e1vel e segura. Ao encontrar um nonce que produz um hash que se conforma \u00e0s regras da rede, os mineradores adicionam novos blocos e recebem recompensas em Bitcoin.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-a-espinha-dorsal-da-seguranca-blockchain\">A espinha dorsal da seguran\u00e7a blockchain<\/h2>\n\n\n\n<p>O Hashing, com suas caracter\u00edsticas de irreversibilidade e singularidade, \u00e9 uma tecnologia essencial que garante a integridade, transpar\u00eancia e seguran\u00e7a das blockchains. Ele liga bloqueios, protege transa\u00e7\u00f5es e protege a rede contra ataques. Sem hash, o ecossistema Web3, as criptomoedas e os muitos casos de uso da blockchain n\u00e3o poderiam funcionar com a confiabilidade que conhecemos hoje. Enquanto o uso de blockchains continua a se diversificar em setores como cripto e finan\u00e7as, o hashing permanece um pilar tecnol\u00f3gico central. Entender a mec\u00e2nica do hash nos dar\u00e1 uma melhor compreens\u00e3o do futuro da seguran\u00e7a digital e das trocas descentralizadas.<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Descubra c\u00f3mo el hashing garantiza la integridad de los datos y la seguridad inmutable de las blockchains. Gracias a funciones criptogr\u00e1ficas como SHA-256, cada transacci\u00f3n se bloquea en un bloque, haciendo imposible cualquier falsificaci\u00f3n.<\/p>\n","protected":false},"author":43,"featured_media":13100,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[117],"tags":[],"class_list":["post-10459","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blockchains"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.0 (Yoast SEO v23.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>O hashing - Web3Factory<\/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:\/\/web3factory.net\/pt-pt\/posts\/o-hashing\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"O hashing\" \/>\n<meta property=\"og:description\" content=\"Descubra c\u00f3mo el hashing garantiza la integridad de los datos y la seguridad inmutable de las blockchains. 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