all-in-one privacy solution":["O Proton Unlimited é uma solução única de privacidade"],"Black Friday":["Black Friday"],"No ads. Privacy by default.":["Sem anúncios. Privacidade por padrão."],"People before profits":["Pessoas acima do lucro"],"Security through transparency":["Segurança por meio da transparência"],"The best Proton Mail ${ BLACK_FRIDAY } deals":["As melhores ofertas de ${ BLACK_FRIDAY } do Proton Mail"],"The world’s only community- supported email service":["O único serviço de e-mail do mundo apoiado pela comunidade"]},"specialoffer:limited":{"${ hours } hour":["${ hours } hora","${ hours } horas"],"${ hoursLeft }, ${ minutesLeft } and ${ secondsLeft } left":["${ hoursLeft }, ${ minutesLeft }, e ${ secondsLeft } restantes"],"${ minutes } minute":["${ minutes } minuto","${ minutes } minutos"],"${ seconds } second":["${ seconds } segundo","${ seconds } segundos"],"Limited time offer":["Oferta por tempo limitado"]},"specialoffer:listitem":{"Create multiple addresses":["Crie vários endereços"],"Hide-my-email aliases":["Use aliases do hide-my-email"],"Quickly unsubscribe from newsletters":["Cancele a assinatura de newsletters rapidamente"],"Use your own domain name":["Use seu próprio nome de domínio"]},"specialoffer:logos":{"As featured in":["Destaques"]},"specialoffer:metadescription":{"Get an encrypted email that protects your privacy":["Obtenha um e-mail criptografado que proteja sua privacidade"]},"specialoffer:metatitle":{"Proton Mail Black Friday Sale - Up to 40% off":["Oferta de Black Friday do Proton Mail - Até 40% de desconto"]},"specialoffer:newmetadescription":{"Get up to 40% off Proton Mail subscriptions this Black Friday. Find great deals on our secure end-to-end encrypted email plans.":["Obtenha até 40% de desconto nas assinaturas do Proton Mail nesta Black Friday. Confira ótimas ofertas em nossos planos de e-mail seguro com criptografia de ponta a ponta."]},"specialoffer:newmetatitle":{"Proton Mail Black Friday sale | Up to 40% off secure email":["Oferta de Black Friday do Proton Mail - Até 40% de desconto no e-mail protegido"]},"specialoffer:note":{"* Billed at ${ TOTAL_SUM } for the first year":["* Com o preço de ${ TOTAL_SUM } no primeiro ano"],"*Billed at ${ TOTAL_SUM } for the first 2 years":["*Com o preço de ${ TOTAL_SUM } nos primeiros dois anos"],"30-day money-back guarantee":["Garantia de reembolso de 30 dias"],"Billed at ${ TOTAL_SUM } for the first 2 years":["Com o preço de ${ TOTAL_SUM } nos primeiros dois anos"],"Billed at ${ TOTAL_SUM } for the first year":["Com o preço de ${ TOTAL_SUM } no primeiro ano"],"You save ${ SAVE_SUM }":["Economize ${ SAVE_SUM }"]},"specialoffer:off":{"${ DISCOUNT } off":["-${ DISCOUNT }"],"${ PERCENT_OFF } off":["-${ PERCENT_OFF }"]},"specialoffer:testimonial":{"I love my ProtonMail":["Adoro ProtonMail"],"My favorite email service":["Meu serviço favorito de e-mail"],"Thanks Proton for keeping us all safe in the complicated internet universe.":["Agradecemos ao Proton por nos manter a salvo no complicado universo da internet."],"You get what you pay for. In the case of big tech, if you pay nothing, you get used. I quit using Gmail and switched to @ProtonMail":["Você recebe pelo que paga. No caso das grandes tecnologias, você se acostuma quando não paga nada. Parei de usar o Gmail e troquei para o @ProtonMail"]},"specialoffer:time":{"Days":["Dias"],"Hours":["Horas"],"Min":["Min"]},"specialoffer:title":{"And much more":["E muito mais"],"Make your inbox yours":["Deixe a caixa de entrada do seu jeito"],"Safe from trackers":["A salvo de rastreadores"],"Stay organized":["Mantenha-se organizado"],"Black Friday email deals":["Ofertas de e-mail da Black Friday"],"Don’t just take our word for it":["Não confie apenas em nossa palavra"],"Our story":["Nossa história"],"Transfer your data from Google in one click":["Transfira seus dados do Google com um clique"]},"specialoffer:tooltip":{"Access blocked content and browse privately. Includes ${ TOTAL_SERVERS }+ servers in ${ TOTAL_COUNTRIES }+ countries, connect up to 10 devices, access worldwide streaming services, malware and ad-blocker, and more.":["Acesse conteúdo bloqueado e navegue com privacidade. Inclui ${ TOTAL_SERVERS } servidores em +${ TOTAL_COUNTRIES } países, conecte até 10 dispositivos, acesse serviços de streaming do mundo todo, malware e bloqueador de anúncios e muito mais."],"Easily share your calendar with your family, friends or colleagues, and view external calendars.":["Compartilhe facilmente seus calendários com amigos, familiares ou colegas e visualize calendários externos."],"Includes support for 1 custom email domain, 10 email addresses, 10 hide-my-email aliases, calendar sharing, and more.":["Inclui suporte para 1 domínio de e-mail personalizado, 10 endereços de e-mail, 10 aliases do hide-my-email, compartilhamento de calendário e muito mais."],"Includes support for 3 custom email domains, 15 email addresses, unlimited hide-my-email aliases, calendar sharing, and more.":["Inclui suporte para 3 domínios de e-mail personalizados, 15 endereços de e-mail, aliases ilimitados do hide-my-email, compartilhamento de calendário e muito mais."],"Manage up to 25 calendars, mobile apps, secured with end-to-end encryption, 1-click calendar import from Google, and more.":["Gerencie até 25 calendários, apps para dispositivos móveis, protegidos com criptografia de ponta a ponta, importação de calendário com 1 clique do Google e muito mais."]},"Status Banner":{"At the moment we are experiencing issues with the Proton VPN service":["No momento estamos enfrentando problemas com o serviço Proton VPN"],"Learn more":["Saiba mais"]},"Status banner":{"Learn more":["Saiba mais"],"Please note that at the moment we are experiencing issues with the ${ issues[0] } service.":["No momento, estamos com problemas no serviço ${ issues[0] }."],"We are experiencing issues with one or more services at the moment.":["No momento, estamos com problemas em um ou mais serviços."]},"suggestions":{"Suggestions":["Sugestões"]},"Support":{"Sub category":["Subcategoria","Subcategorias"]},"Support article":{"${ readingTime } min":["${ readingTime } min","${ readingTime } min"],"Category":["Categoria","Categorias"],"Didn’t find what you were looking for?":["Não encontrou o que procura?"],"General contact":["Contato geral"],"Get help":["Obter ajuda"],"Legal contact":["Contato jurídico"],"Media contact":["Contato de mídia"],"Partnerships contact":["Contato de parcerias"],"Reading":["Leitura"]},"Support categories":{"Browse Proton product support":["Navegar pelo suporte a produtos da Proton"]},"Support category":{"There is no article in this category yet.":["Ainda não há nenhum artigo nesta categoria."]},"Support troubleshooting":{"--- Select ---":["--- Selecionar ---"],"App version":["Versão do aplicativo"],"Browser":["Navegador"],"Check if this helps":["Confira se isso ajuda"],"Choose a category for your question":["Escolha uma categoria para sua pergunta"],"Choose a product":["Selecione um produto"],"Did this solve your issue ?":["Isso resolveu seu problema?"],"Faster assistance is just a few clicks away — please make your selections":["Assistência mais rápida está a apenas alguns cliques de distância — faça suas seleções"],"No, contact support":["Não, entrar em contato com o suporte"],"Proton account":["Conta Proton"],"Proton Bridge":["Proton Bridge"],"Proton Calendar":["Proton Calendar"],"Proton Drive":["Proton Drive"],"Proton for Business":["Proton for Business"],"Proton Mail":["Proton Mail"],"Proton Pass":["Proton Pass"],"Proton VPN":["Proton VPN"],"Thank you for your feedback":["Agradecemos pelo feedback"],"Troubleshooting":["Solução de problemas"],"What can we help with ?":["Como podemos ajudar você?"],"Yes":["Sim"]},"support_modal_search_query":{"Search query":["Consulta de pesquisa"]},"support_search_button":{"Search":["Pesquisar"]},"support_search_i_am_looking_for":{"I'm looking for":["Estou procurando"]},"SupportForm":{"For a faster resolution, please report the issue from the Bridge app: Help > Report a problem.":["Para uma resolução mais rápida, informe o problema no aplicativo Bridge: Ajuda > Comunicar um problema."],"Information":["Informações"]},"SupportForm:option":{"Account Security":["Segurança da conta"],"Contacts":["Contatos"],"Custom email domain":["Domínio de e-mail personalizado"],"Email delivery and Spam":["Entrega de e-mail e spam"],"Encryption":["Criptografia"],"Login and password":["Início de sessão e senha"],"Merge aliases and accounts":["Combinar alias e contas"],"Migrate to Proton":["Migrar para a Proton"],"Notifications":["Notificações"],"Other":["Outros"],"Plans and billing":["Planos e faturamento"],"Proton for Business":["Proton for Business"],"Sign up":["Criar conta"],"Storage":["Armazenamento"],"Users, addresses, and identities":["Usuários, endereços e identidades"]},"SupportForm:optionIntro":{"Select a topic":["Selecione um tópico"]},"swiss_baseed_feature":{"Swiss based":["Sediado na Suíça"]},"Testimonial":{"Awards":["Prêmios"],"Customers":["Clientes"],"Featured":["Em destaque"],"Go to testimonial source":["Ir para a página inicial de depoimentos"],"Reviews":["Avaliações"],"Videos":["Vídeos"]},"Text":{"Find the plan that's right for you":["Encontre o plano certo para você"],"If you need help, check out our ${ supportLink }.":["Se precisar de ajuda, confira nossa ${ supportLink }."],"The page you’re looking for might have been removed, or it could be an\nold link.":["É possível que a página que você está procurando tenha sido removida ou seja um\nlink antigo."]},"Title":{"On this page":["Nesta página"],"Related articles":["Artigos relacionados"],"Share ${ thisPage }":["Compartilhar ${ thisPage }"],"Thank you!":["Obrigado!"],"this page":["esta página"]},"Tooltip":{"More information":["Mais informações"]},"tooltip_calendar":{"Create up to 20 custom & shareable encrypted calendars. On top of that, add up to 5 calendars from friends, family, colleagues, and organizations.":["Crie até 20 calendários compartilháveis personalizados e criptografados. Além disso, é possível adicional até 5 calendários de amigos, família, colegas e organizações."]},"tooltip_vpn":{"Access blocked content and browse privately. Includes ${ TOTAL_SERVERS }+ servers in ${ TOTAL_COUNTRIES }+ countries, highest VPN speed, ${ TOTAL_VPN_CONNECTIONS } VPN connections, worldwide streaming services, malware and ad-blocker, and more.":["Acesse conteúdo bloqueado e navegue com privacidade. Inclui mais de ${ TOTAL_SERVERS } servidores em mais de +${ TOTAL_COUNTRIES } países, VPN com a mais alta velocidade, ${ TOTAL_VPN_CONNECTIONS } conexões VPN, serviços de streaming no mundo todo, malware e bloqueador de anúncios e muito mais."],"Access blocked content and browse privately. Includes ${ TOTAL_SERVERS }+ servers in ${ TOTAL_COUNTRIES }+ countries, highest VPN speed, 10 VPN connections, worldwide streaming services, malware and ad-blocker, and more.":["Acesse conteúdo bloqueado e navegue com privacidade. Inclui mais de ${ TOTAL_SERVERS } servidores em mais de +${ TOTAL_COUNTRIES } países, VPN com a mais alta velocidade, 10 conexões VPN, serviços de streaming no mundo todo, malware e bloqueador de anúncios e muito mais."]},"version_history_label":{"Version history":["Histórico de versões"]},"version_history_tooltip":{"Store up to ${ versionHistoryNumber } versions of each file for up to ${ years } years":["Armazene até ${ versionHistoryNumber } versões de cada arquivo por até ${ years } anos"]},"vpn_features_link":{"View VPN plans":["Visualizar planos de VPN"]},"vpn_features_useCase":{"Access blocked content and browse privately":["Acesse conteúdo bloqueado e navegue com privacidade"]}}},"unleashApi":"https://account.proton.me/api"};
// We need to import data (the framework context) from the server
// This Astro feature with define:vars works well but creates an inline script
// So we can't directly import the initFramework helper, we have to store the context
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How Proton Drive downloads your files without breaking encryption | Proton
Whenever we develop a service, our goal is to make sure it does not leak or expose any of your information at any time to anyone, including ourselves. This is a radically different approach to most Big Tech offerings, where data collection is the true purpose of the service. This approach also means we often have to create entire new frameworks to handle what otherwise might seem like a simple function.
In this article, we explain how Proton Drive downloads your files so that you receive them quickly while making sure your information remains private and encrypted, even from us.
How other cloud storage services download your files
Before we can explain how Proton Drive downloads your files, we’ll need to look at how most cloud storage services download files.
In the early days of the internet, servers handled the vast majority of the “work” (data processing, encryption, etc.), and web apps did relatively little beyond relaying information to the user.
As the internet developed, applications became more complex and handled more of the processing themselves on the user’s devices. While this allows for more functionality, it comes with a downside. Instead of being able to use the massive amounts of memory and computational power of a server in a data center, the application is bound by the amount of memory, features, and computational power of the device it’s running on.
Current app development is a balancing act between what tasks the server will handle and what tasks the client (or app) will handle.
This brings us to your standard cloud storage service. The simplest way to fetch an encrypted file is to:
Have the frontend client, such as your browser, initiate a request and have the backend server deal with it.
The backend server finds the files, creates an archive (if needed), and sends everything back to your browser as a file download.
In this example, your cloud storage service’s backend server does most of the work. Your browser simply receives the file.
This system, while efficient and direct, requires the server to be able to decrypt your files. This simply does not meet Proton’s standard for privacy.
Proton Drive decrypts files locally and doesn’t have access to your data
Our focus on privacy means we do not want any unencrypted data sent to our servers. Consequently, we have our client handle computational work that other cloud storage services can delegate to their centralized servers.
As a result, the way Proton Drive fetches files looks more complex. If the file being downloaded is small, a download on Proton Drive uses the following process:
The frontend client (your browser) initiates the request.
Proton Drive fetches all the related data and sends it in an encrypted state to your browser.
Your browser (the client) decrypts the data, buffers it in memory, and creates an archive that’s then sent out as a classic download.
This way, the Proton server never interacts with unencrypted data or the unencrypted keys that would allow us to decrypt your data. Your client (your browser) handles this entire process. This solution is fast, robust, and straightforward, and the user experience is nearly the same as a standard download.
While this file fetch system works, it is not scalable. We only do this with small files because the size of the file you can download is constrained by the device’s memory, which can vary from device to device. If you’re trying to download 10 GB of files on a device that only has 8 GB of memory, it will simply not work.
Proton Drive “streams” encrypted data to avoid memory constraints
If you want to download a large file (or a lot of files at once), Proton Drive uses another approach: a streaming solution with service workers, which are a type of web worker. A web worker is a web technology that’s used to do work in the background. They let browsers do heavy data processing without freezing or locking up.
A service worker is a special type of web worker that also runs in the background, but it has an important ability: it can act as a proxy, essentially a “middle” layer that can be used for caching. As discussed earlier, a browser can’t create and download a stream without storing the entire file in its device’s memory. Using service workers allows us to work around this limitation. The process of downloading a large encrypted file (or many encrypted files at once) from Proton Drive looks like the following:
The client (your browser) initiates the request.
Proton Drive fetches all the related data and sends it in an encrypted state to a web worker on your browser.
The web worker receives each bit of data, decrypts it, verifies the signature on the file(s), creates an archive (if it’s multiple files), and sends it along in a stream to a service worker. At no point is the entire download compiled or buffered, so it doesn’t matter how much memory your device has.
The data then passes through the service worker in a streaming fashion and is sent to your browser as a standard download.
This process is clearly more complex than normal file downloads, but we have done this extra engineering because we’re committed to your privacy. The use of encrypted data streams is an additional complexity, but an important one because it allows Proton Drive to handle much larger files than most other end-to-end encrypted cloud storage solutions. In fact, the only limit on the size of your download is the amount of storage that comes with your Proton Drive plan (and, of course, your device’s storage capacity).
This system led to a longer development time for Proton Drive, but it enables a more seamless user experience, with the download experience being virtually indistinguishable from unencrypted cloud storage services.
Taking security to the next level with digital signatures
With Proton Drive, we don’t just encrypt your data — we also sign it. We have several signatures to protect our users from possible MITM attacks, including from us. These signatures prove that the data has not been altered, intercepted, or replaced. Checking those signatures on the fly is part of the streaming download process as well.
If we discover an issue, such as a missing or incorrect signature (which could lead to a garbled file or is a sign of a tampered file), we’ll pause the download and show you a pop-up dialog that asks if you want to continue.
Proton Drive – Better cloud storage for a better internet
As you can see, Proton Drive does not simply use the same technology as standard cloud storage services. Our focus on making sure you remain in control of your data at every step while also wanting to deliver seamless, fast service means we must build our own process from the ground up. This can make development tricky, but it’s what is necessary to build the world’s most secure and private cloud storage.
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