{"id":6774,"date":"2024-11-19T18:35:52","date_gmt":"2024-11-19T21:35:52","guid":{"rendered":"https:\/\/base4sec.com\/nao-categorizado\/criptografia-cuantica-en-la-actualidad\/2024\/11\/19\/"},"modified":"2025-02-26T18:51:20","modified_gmt":"2025-02-26T21:51:20","slug":"criptografia-cuantica-en-la-actualidad","status":"publish","type":"post","link":"https:\/\/base4sec.com\/pt-br\/technical-pt-br\/criptografia-cuantica-en-la-actualidad\/2024\/11\/19\/","title":{"rendered":"Criptograf\u00eda cu\u00e1ntica en la actualidad"},"content":{"rendered":"<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-6755 aligncenter\" src=\"https:\/\/base4sec.com\/wp-content\/uploads\/2025\/02\/119-1-300x200.png\" alt=\"\" width=\"384\" height=\"256\" srcset=\"https:\/\/base4sec.com\/wp-content\/uploads\/2025\/02\/119-1-300x200.png 300w, https:\/\/base4sec.com\/wp-content\/uploads\/2025\/02\/119-1-150x100.png 150w, https:\/\/base4sec.com\/wp-content\/uploads\/2025\/02\/119-1.png 601w\" sizes=\"auto, (max-width: 384px) 100vw, 384px\" \/><\/p>\n<p>At\u00e9 hoje, usamos sistemas baseados em bin\u00e1rio, ou seja, em 1 ou 0, ligado e desligado, mas, neste caso, vamos nos concentrar em algo que vai al\u00e9m do mundo bin\u00e1rio, que \u00e9 o mundo qu\u00e2ntico. Bem, os computadores qu\u00e2nticos baseados nos princ\u00edpios da mec\u00e2nica qu\u00e2ntica permitem trabalhar fora do estado bin\u00e1rio, com isso podem realizar v\u00e1rios processos ao mesmo tempo, sendo assim extremamente r\u00e1pidos na resolu\u00e7\u00e3o de problemas criptogr\u00e1ficos de forma mais eficiente, um sistema qu\u00e2ntico poderia quebrar cifras rapidamente em compara\u00e7\u00e3o com o bin\u00e1rio (poderia levar centenas de anos para resolver a cifra &#8220;x&#8221;).<\/p>\n<p>Criptografia p\u00f3s-qu\u00e2ntica (PQC):<br \/>\nA criptografia qu\u00e2ntica \u00e9 baseada em rede, o que implica o Teorema da N\u00e3o-Clonagem, que garante a seguran\u00e7a em esquemas como o QKD (Quantum Key Distribution), j\u00e1 que um invasor n\u00e3o pode copiar um estado qu\u00e2ntico e obter a chave sem ser detectado. Se ele tentasse fazer isso, qualquer tentativa de medi\u00e7\u00e3o interromperia o estado e os participantes (como Alice e Bob) saberiam que havia ocorrido um ataque.<\/p>\n<p>Declara\u00e7\u00e3o do teorema:<br \/>\nDado um estado qu\u00e2ntico \u2223\u03c8\u27e9|, n\u00e3o h\u00e1 nenhuma opera\u00e7\u00e3o qu\u00e2ntica que possa copiar perfeitamente esse estado desconhecido. Em outras palavras, n\u00e3o existe um processo unit\u00e1rio U tal que, para qualquer estado qu\u00e2ntico \u2223\u03c8\u27e9|, ele seja satisfeito:<\/p>\n<p>U(\u2223\u03c8\u27e9\u2297\u22230\u27e9)=\u2223\u03c8\u27e9\u2297\u2223\u03c8\u27e9<\/p>\n<p>Onde:<br \/>\n\u2981 \u2223\u03c8\u27e9 \u00e9 o estado qu\u00e2ntico original.<br \/>\n\u2981 \u22230\u27e9 \u00e9 um estado de terra inicial vazio.<br \/>\n\u2981 \u2223\u03c8\u27e9\u2297\u2297\u2223\u03c8\u27e9 \u00e9 o estado que representaria a c\u00f3pia desejada do estado qu\u00e2ntico original.<\/p>\n<p>Sua base est\u00e1 na dificuldade de resolver certos problemas matem\u00e1ticos associados a estruturas geom\u00e9tricas compostas de pontos regularmente distribu\u00eddos em um espa\u00e7o multidimensional que, embora simples em poucas dimens\u00f5es, tornam-se incrivelmente complexos em espa\u00e7os de alta dimens\u00e3o.<\/p>\n<p>Os pontos em tal estrutura s\u00e3o o resultado da adi\u00e7\u00e3o ou subtra\u00e7\u00e3o de m\u00faltiplos inteiros de um conjunto de vetores da base. Embora em duas dimens\u00f5es essas opera\u00e7\u00f5es sejam relativamente simples, em dimens\u00f5es maiores, a solu\u00e7\u00e3o desses problemas torna-se computacionalmente dif\u00edcil.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-6758 aligncenter\" src=\"https:\/\/base4sec.com\/wp-content\/uploads\/2025\/02\/119-2-300x253.png\" alt=\"\" width=\"300\" height=\"253\" srcset=\"https:\/\/base4sec.com\/wp-content\/uploads\/2025\/02\/119-2-300x253.png 300w, https:\/\/base4sec.com\/wp-content\/uploads\/2025\/02\/119-2-498x420.png 498w, https:\/\/base4sec.com\/wp-content\/uploads\/2025\/02\/119-2-150x127.png 150w, https:\/\/base4sec.com\/wp-content\/uploads\/2025\/02\/119-2.png 603w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>Distribui\u00e7\u00e3o de chave qu\u00e2ntica (QKD):<\/p>\n<p>A distribui\u00e7\u00e3o de chaves qu\u00e2nticas (QKD) \u00e9 uma abordagem inovadora que usa as propriedades qu\u00e2nticas da luz, em vez de depender de matem\u00e1tica complexa, para proteger a gera\u00e7\u00e3o e a distribui\u00e7\u00e3o de chaves de criptografia entre duas partes. Essa abordagem forma a base das redes de seguran\u00e7a qu\u00e2ntica, fornecendo uma solu\u00e7\u00e3o criptogr\u00e1fica que \u00e9 resiliente at\u00e9 mesmo contra ataques de computadores qu\u00e2nticos.<\/p>\n<p>Opera\u00e7\u00e3o do QKD:<br \/>\nPropriedades qu\u00e2nticas da luz<br \/>\nO QKD baseia-se em princ\u00edpios da f\u00edsica qu\u00e2ntica, como o princ\u00edpio da incerteza de Heisenberg e o teorema da n\u00e3o clonagem, que garantem que qualquer tentativa de interceptar as chaves qu\u00e2nticas geradas altere seu estado, permitindo que as partes detectem uma invas\u00e3o.<\/p>\n<p>Gera\u00e7\u00e3o de chaves aleat\u00f3rias<br \/>\nAs chaves de criptografia geradas pelo QKD s\u00e3o completamente aleat\u00f3rias, o que as torna praticamente imposs\u00edveis de prever. Diferentemente dos m\u00e9todos tradicionais, em que as chaves s\u00e3o geradas por algoritmos matem\u00e1ticos, a QKD usa f\u00f3tons (part\u00edculas de luz) para transmitir informa\u00e7\u00f5es sobre as chaves.<\/p>\n<p>Seguran\u00e7a \u00e0 prova de quantum<br \/>\nUma das principais vantagens do QKD \u00e9 que ele oferece seguran\u00e7a \u00e0 prova de computadores qu\u00e2nticos. Embora os computadores qu\u00e2nticos possam amea\u00e7ar a criptografia com base em algoritmos tradicionais (como RSA ou ECC), o QKD permanece seguro, pois n\u00e3o depende da dificuldade computacional, mas das leis da f\u00edsica qu\u00e2ntica.<\/p>\n<p>Protocolo BB84<br \/>\nO protocolo mais comumente usado no QKD \u00e9 o BB84, desenvolvido por Charles Bennett e Gilles Brassard em 1984. Esse protocolo permite que duas partes, comumente chamadas de Alice e Bob, troquem chaves criptogr\u00e1ficas com seguran\u00e7a em um canal qu\u00e2ntico, enquanto usam um canal p\u00fablico tradicional para verificar e corrigir erros.<\/p>\n<p>Garantia de detec\u00e7\u00e3o de intrus\u00e3o:<br \/>\nUm dos destaques do QKD \u00e9 sua capacidade de detectar qualquer tentativa de espionagem. Se um advers\u00e1rio tentar interceptar os f\u00f3tons usados para gerar as chaves, sua interven\u00e7\u00e3o alterar\u00e1 as propriedades qu\u00e2nticas dos f\u00f3tons, alertando as partes envolvidas sobre a presen\u00e7a de um intruso, e as chaves afetadas poder\u00e3o ser descartadas.<\/p>\n<p>Voc\u00ea pode encontrar um laborat\u00f3rio que simula o BB84 no link a seguir.<\/p>\n<p>Tecnologias atuais<br \/>\nA empresa japonesa Toshiba desenvolveu sistemas de hardware associados ao QKD.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-6761 aligncenter\" src=\"https:\/\/base4sec.com\/wp-content\/uploads\/2025\/02\/119-3-300x170.png\" alt=\"\" width=\"300\" height=\"170\" srcset=\"https:\/\/base4sec.com\/wp-content\/uploads\/2025\/02\/119-3-300x170.png 300w, https:\/\/base4sec.com\/wp-content\/uploads\/2025\/02\/119-3-150x85.png 150w, https:\/\/base4sec.com\/wp-content\/uploads\/2025\/02\/119-3.png 601w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-6764 aligncenter\" src=\"https:\/\/base4sec.com\/wp-content\/uploads\/2025\/02\/119-4-300x126.png\" alt=\"\" width=\"300\" height=\"126\" srcset=\"https:\/\/base4sec.com\/wp-content\/uploads\/2025\/02\/119-4-300x126.png 300w, https:\/\/base4sec.com\/wp-content\/uploads\/2025\/02\/119-4-150x63.png 150w, https:\/\/base4sec.com\/wp-content\/uploads\/2025\/02\/119-4.png 568w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-6767 aligncenter\" src=\"https:\/\/base4sec.com\/wp-content\/uploads\/2025\/02\/119-5-300x157.png\" alt=\"\" width=\"300\" height=\"157\" srcset=\"https:\/\/base4sec.com\/wp-content\/uploads\/2025\/02\/119-5-300x157.png 300w, https:\/\/base4sec.com\/wp-content\/uploads\/2025\/02\/119-5-150x79.png 150w, https:\/\/base4sec.com\/wp-content\/uploads\/2025\/02\/119-5.png 601w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>Conclus\u00e3o<br \/>\nO mundo da seguran\u00e7a qu\u00e2ntica \u00e9 complexo e abrangente. Apesar do progresso que foi feito, ainda h\u00e1 muito mais a ser explorado. Manter-se \u00e0 frente da curva \u00e9 um imperativo no campo da seguran\u00e7a cibern\u00e9tica, onde as amea\u00e7as e as tecnologias evoluem todos os dias, exigindo novas solu\u00e7\u00f5es e abordagens inovadoras para garantir a prote\u00e7\u00e3o das informa\u00e7\u00f5es em um ambiente cada vez mais desafiador.<\/p>\n<p>Refer\u00eancias:<\/p>\n<p><a href=\"https:\/\/csrc.nist.gov\/projects\/post-quantum-cryptography\" rel=\"nofollow\">https:\/\/csrc.nist.gov\/projects\/post-quantum-cryptography<\/a><\/p>\n<p><a href=\"https:\/\/www.global.toshiba\/ww\/products-solutions\/security-ict\/qkd.html\" rel=\"nofollow\">https:\/\/www.global.toshiba\/ww\/products-solutions\/security-ict\/qkd.html<\/a><\/p>\n<p><a href=\"https:\/\/es.wikipedia.org\/wiki\/Wikipedia\" rel=\"nofollow\">https:\/\/es.wikipedia.org\/wiki\/Wikipedia<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>&nbsp; At\u00e9 hoje, usamos sistemas baseados em bin\u00e1rio, ou seja, em 1 ou 0, ligado e desligado, mas, neste caso, vamos nos concentrar em algo que vai al\u00e9m do mundo bin\u00e1rio, que \u00e9 o mundo qu\u00e2ntico. Bem, os computadores qu\u00e2nticos baseados nos princ\u00edpios da mec\u00e2nica qu\u00e2ntica permitem trabalhar fora do estado bin\u00e1rio, com isso podem [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":6753,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_wpcom_ai_launchpad_first_post":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[260],"tags":[],"class_list":["post-6774","post","type-post","status-publish","format-standard","has-post-thumbnail","category-technical-pt-br"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.9 (Yoast SEO v27.9) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Criptograf\u00eda cu\u00e1ntica en la actualidad - BASE4 Security<\/title>\n<meta name=\"description\" content=\"BASE4 Security, consultora de ciberseguridad con presencia en Argentina, Chile, Per\u00fa, Colombia, M\u00e9xico y Espa\u00f1a. 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