all-in-one privacy solution":["Proton Unlimited es solución de privacidad más completa"],"Black Friday":["Black Friday"],"No ads. Privacy by default.":["Sin publicidad. La privacidad por bandera."],"People before profits":["Nos importan las personas, no los beneficios"],"Security through transparency":["Seguridad con transparencia"],"The best Proton Mail ${ BLACK_FRIDAY } deals":["Las mejores ofertas del ${ BLACK_FRIDAY } de Proton Mail"],"The world’s only community- supported email service":["El único servicio de correo electrónico con apoyo de la comunidad"]},"specialoffer:limited":{"${ hours } hour":["${ hours } hora","${ hours } horas"],"${ hoursLeft }, ${ minutesLeft } and ${ secondsLeft } left":["Tiempo restante: ${ hoursLeft }, ${ minutesLeft } y ${ secondsLeft }"],"${ minutes } minute":["${ minutes } minuto","${ minutes } minutos"],"${ seconds } second":["${ seconds } segundo","${ seconds } segundos"],"Limited time offer":["Oferta por tiempo limitado"]},"specialoffer:listitem":{"Create multiple addresses":["Crea varias direcciones"],"Hide-my-email aliases":["Alias de hide-my-email"],"Quickly unsubscribe from newsletters":["Date de baja rápidamente de boletines"],"Use your own domain name":["Usa tu propio nombre de dominio"]},"specialoffer:logos":{"As featured in":["Hablan de nosotros"]},"specialoffer:metadescription":{"Get an encrypted email that protects your privacy":["Apuesta por un servicio de correo electrónico cifrado que protege tu privacidad"]},"specialoffer:metatitle":{"Proton Mail Black Friday Sale - Up to 40% off":["Rebajas de Black Friday de Proton: hasta un 40 % de descuento"]},"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.":["Contrata Proton Mail con hasta un 40 % de descuento en las rebajas de Black Friday. Encontrarás nuestros planes de correo electrónico cifrado de extremo a extremo al mejor precio."]},"specialoffer:newmetatitle":{"Proton Mail Black Friday sale | Up to 40% off secure email":["Rebajas de Black Friday en Proton Mail | Correo electrónico seguro con hasta un 40 % de descuento"]},"specialoffer:note":{"* Billed at ${ TOTAL_SUM } for the first year":["* A un precio de ${ TOTAL_SUM } durante el primer año"],"*Billed at ${ TOTAL_SUM } for the first 2 years":["*A un precio de ${ TOTAL_SUM } durante los 2 primeros años"],"30-day money-back guarantee":["Garantía de devolución de 30 días"],"Billed at ${ TOTAL_SUM } for the first 2 years":["A un precio de ${ TOTAL_SUM } durante los 2 primeros años"],"Billed at ${ TOTAL_SUM } for the first year":["A un precio de ${ TOTAL_SUM } durante el primer año"],"You save ${ SAVE_SUM }":["Ahorras ${ SAVE_SUM }"]},"specialoffer:off":{"${ DISCOUNT } off":["−${ DISCOUNT }"],"${ PERCENT_OFF } off":["−${ PERCENT_OFF }"]},"specialoffer:testimonial":{"I love my ProtonMail":["Adoro ProtonMail"],"My favorite email service":["Mi servicio de correo electrónico favorito"],"Thanks Proton for keeping us all safe in the complicated internet universe.":["Gracias, Proton, por brindarnos protección en este mundo salvaje de 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":["Dan justo lo que prometen. Si las grandes tecnológicas te ofrecen algo gratis, se aprovechan de ti, por eso dejé de usar Gmail y me pasé a @ProtonMail"]},"specialoffer:time":{"Days":["días"],"Hours":["horas"],"Min":["min"]},"specialoffer:title":{"And much more":["Y mucho más"],"Make your inbox yours":["Personaliza tu bandeja de entrada"],"Safe from trackers":["Evita los rastreadores"],"Stay organized":["Mantenlo todo en orden"],"Black Friday email deals":["Ofertas en correo electrónico del Black Friday"],"Don’t just take our word for it":["Lee testimonios de otras personas"],"Our story":["Nuestra historia"],"Transfer your data from Google in one click":["Transfiere tus datos de Google con un clic"]},"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.":["Accede a contenido bloqueado y navega con privacidad. Incluye ${ TOTAL_SERVERS } servidores en más de ${ TOTAL_COUNTRIES } países. Conecta hasta 10 dispositivos, acceder a servicios de streaming de todo el mundo, dispón de la protección de bloqueadores de malware y anuncios, etc."],"Easily share your calendar with your family, friends or colleagues, and view external calendars.":["Comparte tu calendario con familiares, amigos y compañeros fácilmente y consulta calendarios externos."],"Includes support for 1 custom email domain, 10 email addresses, 10 hide-my-email aliases, calendar sharing, and more.":["Incluye compatibilidad con 1 dominio de correo electrónico personalizado, 10 direcciones de correo electrónico, 10 alias de hide-my-email, posibilidad de compartir calendario, etc."],"Includes support for 3 custom email domains, 15 email addresses, unlimited hide-my-email aliases, calendar sharing, and more.":["Incluye compatibilidad con 3 dominios de correo electrónico personalizado, 15 direcciones de correo electrónico, alias ilimitados de hide-my-email, posibilidad de compartir calendario, etc."],"Manage up to 25 calendars, mobile apps, secured with end-to-end encryption, 1-click calendar import from Google, and more.":["Gestiona hasta 25 calendarios protegidos con cifrado de extremo a extremo y con opción, por ejemplo, de importar los de Google con un solo clic."]},"Status Banner":{"At the moment we are experiencing issues with the Proton VPN service":["Hay problemas con el servicio de Proton VPN en estos momentos"],"Learn more":["Más información"]},"Status banner":{"Learn more":["Más información"],"Please note that at the moment we are experiencing issues with the ${ issues[0] } service.":["Ten presente que, en estos momentos, el servicio de ${ issues[0] } está dando problemas de funcionamiento."],"We are experiencing issues with one or more services at the moment.":["Uno o varios servicios están dando problemas de funcionamiento en estos momentos."]},"suggestions":{"Suggestions":["Sugerencias"]},"Support":{"Sub category":["Subcategoría","Subcategorías"]},"Support article":{"${ readingTime } min":["${ readingTime } min","${ readingTime } min"],"Category":["Categoría","Categorías"],"Didn’t find what you were looking for?":["¿No has encontrado lo que buscabas?"],"General contact":["Contacto para consultas generales"],"Get help":["Obtener ayuda"],"Legal contact":["Contacto para cuestiones legales"],"Media contact":["Contacto para prensa y medios de comunicación"],"Partnerships contact":["Contacto para colaboraciones"],"Reading":["Lectura"]},"Support categories":{"Browse Proton product support":["Consulta la página de asistencia para productos de Proton"]},"Support category":{"There is no article in this category yet.":["No hay ningún artículo aún en esta categoría."]},"Support troubleshooting":{"--- Select ---":["--- Selecciona ---"],"App version":["Versión de la aplicación"],"Browser":["Navegador"],"Check if this helps":["Comprueba a ver si te sirve"],"Choose a category for your question":["Elige la categoría de tu consulta"],"Choose a product":["Elegir producto"],"Did this solve your issue ?":["¿Te ha resultado útil para resolver el problema?"],"Faster assistance is just a few clicks away — please make your selections":["Haz unos cuantos clics para obtener ayuda más rápidamente. Haz tu selección."],"No, contact support":["No, contactar con el equipo de asistencia"],"Proton account":["Cuenta de 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":["Gracias por tus comentarios"],"Troubleshooting":["Solución de problemas"],"What can we help with ?":["¿Cómo podemos ayudarte?"],"Yes":["Sí"]},"support_modal_search_query":{"Search query":["Consulta de búsqueda"]},"support_search_button":{"Search":["Buscar"]},"support_search_i_am_looking_for":{"I'm looking for":["Busco"]},"SupportForm":{"For a faster resolution, please report the issue from the Bridge app: Help > Report a problem.":["Para una resolución más rápida, informa del problema desde la aplicación Bridge: Ayuda > Notificar un problema."],"Information":["Información"]},"SupportForm:option":{"Account Security":["Seguridad de la cuenta"],"Contacts":["Contactos"],"Custom email domain":["Dominio de correo electrónico personalizado"],"Email delivery and Spam":["Envío de correos electrónico y spam"],"Encryption":["Cifrado"],"Login and password":["Inicio de sesión y contraseña"],"Merge aliases and accounts":["Fusionar seudónimos y cuentas"],"Migrate to Proton":["Migrar a Proton"],"Notifications":["Notificaciones"],"Other":["Otro"],"Plans and billing":["Planes y facturación"],"Proton for Business":["Proton for Business"],"Sign up":["Regístrate"],"Storage":["Almacenamiento"],"Users, addresses, and identities":["Usuarios, direcciones e identidades"]},"SupportForm:optionIntro":{"Select a topic":["Selecciona un tema"]},"swiss_baseed_feature":{"Swiss based":["Con sede en Suiza"]},"Testimonial":{"Awards":["Premios"],"Customers":["Clientes"],"Featured":["Destacado"],"Go to testimonial source":["Ir a la fuente del testimonio"],"Reviews":["Opiniones"],"Videos":["Vídeos"]},"Text":{"Find the plan that's right for you":["Encuentra el plan más adecuado para tus necesidades"],"If you need help, check out our ${ supportLink }.":["Si necesitas ayuda, consulta nuestra ${ supportLink }."],"The page you’re looking for might have been removed, or it could be an\nold link.":["Es posible que la página que buscas haya sido eliminada o que sea un\nenlace antiguo."]},"Title":{"On this page":["En esta página"],"Related articles":["Artículos relacionados"],"Share ${ thisPage }":["Compartir ${ thisPage }"],"Thank you!":["¡Gracias!"],"this page":["esta página"]},"Tooltip":{"More information":["Más información"]},"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.":["Crea hasta 20 calendarios personalizados y cifrados que puedes compartir con otras personas, y añade además hasta 5 calendarios de amigos, familiares, compañeros y organizaciones."]},"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.":["Accede a contenido bloqueado y navega en privado. Tendrás a tu disposición más de ${ TOTAL_SERVERS } servidores en más de ${ TOTAL_COUNTRIES } países, VPN de máxima velocidad, ${ TOTAL_VPN_CONNECTIONS } conexiones VPN, servicios de streaming en todo el mundo, bloqueadores de malware y de anuncios, y mucho más."],"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.":["Accede a contenido bloqueado y navega en privado. Tendrás a tu disposición más de ${ TOTAL_SERVERS } servidores en más de ${ TOTAL_COUNTRIES } países, VPN de máxima velocidad, 10 conexiones VPN, servicios de streaming en todo el mundo, bloqueadores de malware y de anuncios, y mucho más."]},"version_history_label":{"Version history":["Historial de versiones"]},"version_history_tooltip":{"Store up to ${ versionHistoryNumber } versions of each file for up to ${ years } years":["Almacena hasta ${ versionHistoryNumber } versiones de cada archivo durante ${ years } años como máximo"]},"vpn_features_link":{"View VPN plans":["Ver planes de VPN"]},"vpn_features_useCase":{"Access blocked content and browse privately":["Accede a contenido bloqueado y navega con privacidad"]}}},"unleashApi":"https://account.proton.me/api"};
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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.
Secure, seamless communication is the foundation of every business. As more
organizations secure their data with Proton, we’ve dramatically expanded our
ecosystem with new products and services, from our password manager to Dark Web
Monitoring for cr
On the subject of cybersecurity, one term that often comes up is brute force
attack. A brute force attack is any attack that doesn’t rely on finesse, but
instead uses raw computing power to crack security or even the underlying
encryption.
In this a
Section 702 of the Foreign Intelligence Surveillance Act has become notorious as
the legal justification allowing federal agencies like the NSA, CIA, and FBI to
perform warrantless wiretaps, which sweep up the data of hundreds of thousands
of US citi
In response to the growing number of data breaches, Proton Mail offers a feature
to paid subscribers called Dark Web Monitoring. Our system checks if your
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Your email address is your online identity, and you share it whenever you create
a new account for an online service. While this offers convenience, it also
leaves your identity exposed if hackers manage to breach the services you use.
Data breaches
Our mission at Proton is to help usher in an internet that protects your privacy
by default, secures your data, and gives you the freedom of choice.
Today we’re taking another step in this direction with the launch of our open
source password manage