{"id":2671,"date":"2026-03-18T16:51:04","date_gmt":"2026-03-18T19:51:04","guid":{"rendered":"https:\/\/hackerrangers.com\/?p=2671"},"modified":"2026-03-18T17:08:02","modified_gmt":"2026-03-18T20:08:02","slug":"o-que-e-nfc-e-quais-cuidados-voce-deve-tomar-com-esta-tecnologia","status":"publish","type":"post","link":"https:\/\/tmp-hackerrangers.siteup.dev\/pt\/awareness\/o-que-e-nfc-e-quais-cuidados-voce-deve-tomar-com-esta-tecnologia\/","title":{"rendered":"O que \u00e9 NFC e quais cuidados voc\u00ea deve tomar com esta tecnologia"},"content":{"rendered":"

Voc\u00ea certamente j\u00e1 ouviu falar \u2014 ou leu em algum lugar \u2014 a respeito da tecnologia NFC, mas nem todos sabem exatamente o que ela \u00e9 e tampouco como funciona. Antes de mais nada, aqui vai uma verdade que pode ser chocante para muitos: embora tenha se popularizado no Brasil s\u00f3 nos \u00faltimos anos, o padr\u00e3o NFC (sigla para Near Field Communications ou Comunica\u00e7\u00f5es por Campo de Proximidade) n\u00e3o \u00e9 algo novo. Ele foi inventado em 2002 atrav\u00e9s de esbo\u00e7os t\u00e9cnicos feitos pela Philips e pela Sony.<\/span><\/p>\n

A ideia era simples: criar uma tecnologia que permitisse com que dois dispositivos trocassem informa\u00e7\u00f5es entre si sem o aux\u00edlio de fios ao entrarem em um campo eletromagn\u00e9tico de baixa amplitude \u2014 em termos de unidade de comprimento, estamos falando de uma dist\u00e2ncia de no m\u00e1ximo 10 cent\u00edmetros (mas geralmente \u00e9 ainda menor, ficando na faixa dos tr\u00eas ou dois cent\u00edmetros). As aplica\u00e7\u00f5es do NFC s\u00e3o variadas e, com a ajuda da nip\u00f4nica Sony, popularizou-se de imediato na regi\u00e3o asi\u00e1tica.<\/span><\/p>\n

O mais bacana da tecnologia \u00e9 que, similar \u00e0 mais antiga RFID (Radio-Frequency Identification ou Identifica\u00e7\u00e3o por Radiofrequ\u00eancia), a NFC n\u00e3o exige que o portador de seu chip possua uma fonte pr\u00f3pria de energia, o que lhe permite ser incorporado em cart\u00f5es, tags e at\u00e9 mesmo adesivos. Na chamada leitura passiva, \u00e9 o aparelho leitor (que pode ser um smartphone ou um receptor dedicado para tal) que energiza o chip no momento em que ele se aproxima, lendo, gravando ou modificando as informa\u00e7\u00f5es gravadas em tal.<\/span><\/p>\n

Hoje em dia, o NFC j\u00e1 tomou o mundo \u2014 e \u00e9 bem prov\u00e1vel que ele esteja presente na sua vida mesmo que voc\u00ea n\u00e3o perceba. Aqui no Brasil, sua \u201cinaugura\u00e7\u00e3o silenciosa\u201d foi celebrada nos cart\u00f5es de transporte p\u00fablico, como no paulistano <\/span>Bilhete \u00danico; ele cont\u00e9m um chip NFC do padr\u00e3o Mifare em seu interior e, gra\u00e7as a isso, \u00e9 poss\u00edvel inserir cr\u00e9ditos nele atrav\u00e9s de um celular que tenha um leitor embutido. Mais recentemente, cart\u00f5es de cr\u00e9dito tamb\u00e9m passaram a abra\u00e7ar tal padr\u00e3o para permitir pagamentos sem contato.<\/span><\/p>\n

Encostou, pagou\u2026 Ou roubou<\/b><\/h2>\n

E \u00e9 a\u00ed que a coisa complica. Os pagamentos sem contato (contactless) se popularizaram de forma absurda durante os per\u00edodos mais cr\u00edticos da crise do novo coronav\u00edrus (SARS-CoV2), j\u00e1 que era muito mais seguro apenas aproximar seu cart\u00e3o de cr\u00e9dito da maquininha do que permitir que o vendedor o pegasse nas m\u00e3os. O brasileiro se acostumou com tal facilidade rapidamente; o que poucos sabem \u00e9 que, da mesma forma que o NFC pode ser uma m\u00e3o-na-roda, ele tamb\u00e9m representa riscos \u00e0 sua seguran\u00e7a.<\/span><\/p>\n

N\u00e3o \u00e9 dif\u00edcil, para um criminoso cibern\u00e9tico, roubar dinheiro da sua conta utilizando um aparelho constru\u00eddo para tal. Basta que voc\u00ea esteja em um lugar cheio<\/a>e ele vai se aproximar, encostar o leitor malicioso em seu bolso e \u201crequisitar\u201d ao chip do cart\u00e3o que ele lhe envie dinheiro, como uma maquininha de vendas convencional. N\u00e3o \u00e9 \u00e0 toa que a recomenda\u00e7\u00e3o entre os especialistas de seguran\u00e7a \u00e9 que voc\u00ea desative o pagamento por aproxima\u00e7\u00e3o caso pretenda comparecer a lugares cheios, como uma festa, por exemplo.<\/span><\/p>\n

Os golpes n\u00e3o param por a\u00ed. Pela rapidez e aparente praticidade dos pagamentos contactless, \u00e9 comum que o cidad\u00e3o, ao fazer uma compra, nem sequer confira se o valor que est\u00e1 sendo cobrado na maquininha est\u00e1 correto. S\u00e3o muitas as queixas de clientes de aplicativos de delivery que foram lesados por pessoas mal-intencionadas \u2014 h\u00e1 at\u00e9 quem quebre intencionalmente o display da maquineta para que, em vez de R$ 20, sejam cobrados R$ 200 do cliente desatento.<\/span><\/p>\n

\u00c9 bom ficar de olho<\/b><\/h2>\n

Como dissemos, embora extremamente popular na \u00c1sia, a tecnologia NFC ainda \u00e9 nova no Brasil e \u00e9 natural que os cidad\u00e3os n\u00e3o estejam acostumados a tomar os devidos cuidados. Caso opte pelos pagamentos contactless, sempre confira o valor que est\u00e1 sendo cobrado na maquineta antes de aproximar seu cart\u00e3o \u2014 jamais aceite efetuar transfer\u00eancias em dispositivos que estejam \u201cquebrados\u201d ou cuja leitura no display seja dif\u00edcil. Sempre pe\u00e7a tamb\u00e9m a sua via do comprovante de pagamento para checar o valor cobrado.<\/span><\/p>\n

Em rela\u00e7\u00e3o aos \u201cleitores ladr\u00f5es\u201d, a recomenda\u00e7\u00e3o \u00e9 simplesmente desativar o pagamento por aproxima\u00e7\u00e3o caso voc\u00ea saiba que passar\u00e1 por locais de grande movimenta\u00e7\u00e3o \u2014 isso pode ser feito pelo app de seu banco. Se esse \u201cliga-desliga\u201d lhe parecer muito inc\u00f4modo, vale a pena ent\u00e3o investir em uma carteira anti-furto NFC: elas s\u00e3o feitas com um revestimento especial em alum\u00ednio, que impede a comunica\u00e7\u00e3o entre o chip e leitores. Estas carteiras j\u00e1 s\u00e3o facilmente encontradas em lojas online e t\u00eam pre\u00e7os acess\u00edveis.<\/span><\/p>\n

Por fim, tamb\u00e9m \u00e9 interessante tomar cuidado com o seu celular equipado com uma antena NFC. Mantenha a fun\u00e7\u00e3o desligada at\u00e9 que seja necess\u00e1rio us\u00e1-la, visto que voc\u00ea pode ler, sem querer, uma tag que desencadear\u00e1 o download de um malware em seu dispositivo m\u00f3vel. Esse \u00e9 um cen\u00e1rio perfeitamente poss\u00edvel e assustador, visto que, novamente, os chips podem ser embutidos em qualquer coisa \u2014 um chaveiro, um adesivo ou at\u00e9 mesmo o anel de algu\u00e9m que lhe pede seu smartphone emprestado por alguns segundos.<\/span><\/p>","protected":false},"excerpt":{"rendered":"

You’ve certainly heard \u2014 or read somewhere \u2014 about NFC technology, but not everyone knows exactly what it is or how it works. First of all, this may come as a surprise to many: although it has only become popular in Brazil in recent years, the NFC standard (an acronym for Near-Field Communications) is not […]<\/p>\n","protected":false},"author":4009,"featured_media":2672,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"content-type":"","inline_featured_image":false,"footnotes":""},"categories":[46],"tags":[157,90,64,160,161],"class_list":["post-2671","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-awareness","tag-awarenesss","tag-cybercrime","tag-cybersecurity","tag-nfc","tag-payment"],"yoast_head":"\nWhat is NFC and what precautions should you take with this technology? | Hacker Rangers<\/title>\n<meta name=\"description\" content=\"What is NFC and how does it work? 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