all-in-one privacy solution":["Proton Unlimited è una soluzione completa per la privacy"],"Black Friday":["Black Friday"],"No ads. Privacy by default.":["Niente pubblicità. La prima regola è la privacy."],"People before profits":["Le persone prima dei profitti"],"Security through transparency":["Più sicurezza grazie alla trasparenza"],"The best Proton Mail ${ BLACK_FRIDAY } deals":["Le migliori offerte di Proton Mail per il ${ BLACK_FRIDAY }"],"The world’s only community- supported email service":["L'unico servizio di posta elettronica al mondo supportato dalla community"]},"specialoffer:limited":{"${ hours } hour":["${ hours } ora","${ hours } ore"],"${ hoursLeft }, ${ minutesLeft } and ${ secondsLeft } left":["Restano ${ hoursLeft }, ${ minutesLeft } e ${ secondsLeft }"],"${ minutes } minute":["${ minutes } minuto","${ minutes } minuti"],"${ seconds } second":["${ seconds } secondo","${ seconds } secondi"],"Limited time offer":["Offerta a tempo limitato"]},"specialoffer:listitem":{"Create multiple addresses":["Crea indirizzi multipli"],"Hide-my-email aliases":["Alias hide-my-email"],"Quickly unsubscribe from newsletters":["Annulla rapidamente l'iscrizione alle newsletter"],"Use your own domain name":["Utilizza il tuo nome di dominio"]},"specialoffer:logos":{"As featured in":["Ne hanno parlato"]},"specialoffer:metadescription":{"Get an encrypted email that protects your privacy":["Scegli un'email cifrata per proteggere la tua privacy"]},"specialoffer:metatitle":{"Proton Mail Black Friday Sale - Up to 40% off":["Offerta Black Friday di Proton Mail - sconti fino al 40%"]},"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.":["Per questo Black Friday ti offriamo fino al 40% di sconto sugli abbonamenti a Proton Mail. Scopri le straordinarie offerte sui piani di abbonamento alla nostra email dotata di crittografia end-to-end."]},"specialoffer:newmetatitle":{"Proton Mail Black Friday sale | Up to 40% off secure email":["Offerta di Proton Mail per il Black Friday | Fino al 40% di sconto sulla nostra email sicura"]},"specialoffer:note":{"* Billed at ${ TOTAL_SUM } for the first year":["* Addebito di ${ TOTAL_SUM } per il primo anno"],"*Billed at ${ TOTAL_SUM } for the first 2 years":["*Addebito di ${ TOTAL_SUM } per i primi 2 anni"],"30-day money-back guarantee":["Garanzia soddisfatti o rimborsati di 30 giorni"],"Billed at ${ TOTAL_SUM } for the first 2 years":["Addebito di ${ TOTAL_SUM } per i primi 2 anni"],"Billed at ${ TOTAL_SUM } for the first year":["Addebito di ${ TOTAL_SUM } per il primo anno"],"You save ${ SAVE_SUM }":["Risparmi ${ SAVE_SUM }"]},"specialoffer:off":{"${ DISCOUNT } off":["−${ DISCOUNT }"],"${ PERCENT_OFF } off":["−${ PERCENT_OFF }"]},"specialoffer:testimonial":{"I love my ProtonMail":["Adoro ProtonMail"],"My favorite email service":["Il mio servizio email preferito"],"Thanks Proton for keeping us all safe in the complicated internet universe.":["Grazie Proton perché ci proteggi nell'universo complicato di 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":["Ottieni quello per cui hai pagato. Nel caso di big tech, se non paghi niente, vieni usato. Ho smesso di usare Gmail e sono passata a @ProtonMail"]},"specialoffer:time":{"Days":["Giorni"],"Hours":["Ore"],"Min":["Min"]},"specialoffer:title":{"And much more":["E molto altro"],"Make your inbox yours":["Personalizza la tua casella di posta"],"Safe from trackers":["Protezione dai tracker"],"Stay organized":["Mantieni tutto organizzato"],"Black Friday email deals":["Offerte email del Black Friday"],"Don’t just take our word for it":["Non lo diciamo solo noi"],"Our story":["La nostra storia"],"Transfer your data from Google in one click":["Trasferisci i tuoi dati da Google con un solo 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.":["Accedi a contenuti bloccati e naviga in modalità privata. Include ${ TOTAL_SERVERS } server in più di ${ TOTAL_COUNTRIES } Paesi, possibilità di connettere fino a 10 dispositivi, accesso a servizi di streaming in tutto il mondo, blocco di malware e adblocker, e altro ancora."],"Easily share your calendar with your family, friends or colleagues, and view external calendars.":["Condividi facilmente il tuo calendario con familiari, amici o colleghi e visualizza calendari esterni."],"Includes support for 1 custom email domain, 10 email addresses, 10 hide-my-email aliases, calendar sharing, and more.":["Include il supporto per 1 dominio email personalizzato, 10 indirizzi email, 10 alias hide-my-email, condivisione del calendario e altro ancora."],"Includes support for 3 custom email domains, 15 email addresses, unlimited hide-my-email aliases, calendar sharing, and more.":["Include il supporto per 3 domini email personalizzati, 15 indirizzi email, alias hide-my-email illimitati, condivisione del calendario e altro ancora."],"Manage up to 25 calendars, mobile apps, secured with end-to-end encryption, 1-click calendar import from Google, and more.":["Gestisci fino a 25 calendari, app per dispositivi mobili, protezione con la crittografia end-to-end, importazione del calendario da Google in un solo clic e altro ancora."]},"Status Banner":{"At the moment we are experiencing issues with the Proton VPN service":["Al momento abbiamo dei problemi con il servizio di Proton VPN"],"Learn more":["Scopri di più"]},"Status banner":{"Learn more":["Scopri di più"],"Please note that at the moment we are experiencing issues with the ${ issues[0] } service.":["Attenzione: stiamo riscontrando dei problemi con il servizio di ${ issues[0] }"],"We are experiencing issues with one or more services at the moment.":["Stiamo riscontrando dei problemi con uno o più servizi."]},"suggestions":{"Suggestions":["Suggerimenti"]},"Support":{"Sub category":["Sottocategoria","Sottocategorie"]},"Support article":{"${ readingTime } min":["${ readingTime } minuto","${ readingTime } minuti"],"Category":["Categoria","Categorie"],"Didn’t find what you were looking for?":["Non hai trovato quello che cercavi?"],"General contact":["Contatti generali"],"Get help":["Ottieni supporto"],"Legal contact":["Contatti legali"],"Media contact":["Contatti per la stampa"],"Partnerships contact":["Contatti per collaborazioni"],"Reading":["Lettura"]},"Support categories":{"Browse Proton product support":["Consulta l'assistenza sui prodotti Proton"]},"Support category":{"There is no article in this category yet.":["Per ora non ci sono articoli in questa categoria."]},"Support troubleshooting":{"--- Select ---":["--- Seleziona ---"],"App version":["Versione dell'app"],"Browser":["Browser"],"Check if this helps":["Verifica se questo ti è utile"],"Choose a category for your question":["Scegli una categoria per la tua domanda"],"Did this solve your issue ?":["Ti ha risolto il problema?"],"Faster assistance is just a few clicks away — please make your selections":["Ottieni assistenza più velocemente con pochi clic. Fai la tua selezione"],"No, contact support":["No, contatta il supporto"],"Thank you for your feedback":["Grazie per il feedback"],"Troubleshooting":["Risoluzione dei problemi"],"What can we help with ?":["In cosa possiamo esserti di aiuto?"],"Yes":["Sì"]},"support_modal_search_query":{"Search query":["Query di ricerca"]},"support_search_button":{"Search":["Cerca"]},"support_search_i_am_looking_for":{"I'm looking for":["Sto cercando"]},"SupportForm":{"For a faster resolution, please report the issue from the Bridge app: Help > Report a problem.":["Per una risoluzione più rapida, segnala il problema dall'app Bridge: Aiuto > Segnala un problema."],"Information":["Informazioni"]},"SupportForm:option":{"Account Security":["Sicurezza dell'account"],"Contacts":["Contatti"],"Custom email domain":["Dominio email personalizzato"],"Email delivery and Spam":["Consegna delle email e spam"],"Encryption":["Crittografia"],"Login and password":["Login e password"],"Merge aliases and accounts":["Unione di alias e account"],"Migrate to Proton":["Migrazione a Proton"],"Notifications":["Notifiche"],"Other":["Altro"],"Plans and billing":["Piani e fatturazione"],"Proton for Business":["Proton for Business"],"Sign up":["Iscrizione"],"Storage":["Archiviazione"],"Users, addresses, and identities":["Utenti, indirizzi e identità"]},"SupportForm:optionIntro":{"Select a topic":["Seleziona un argomento"]},"swiss_baseed_feature":{"Swiss based":["Con sede in Svizzera"]},"Testimonial":{"Awards":["Premi"],"Customers":["Clienti"],"Featured":["In evidenza"],"Go to testimonial source":["Vai alle testimonianze"],"Reviews":["Recensioni"],"Videos":["Video"]},"Text":{"Find the plan that's right for you":["Trova il piano che fa per te"],"If you need help, check out our ${ supportLink }.":["Se ti serve assistenza dai un’occhiata alla nostra ${ supportLink }."],"The page you’re looking for might have been removed, or it could be an\nold link.":["La pagina che stai cercando potrebbe essere stata rimossa, o il link potrebbe essere vecchio."]},"Title":{"On this page":["In questa pagina"],"Related articles":["Articoli correlati"],"Share ${ thisPage }":["Condividi ${ thisPage }"],"Thank you!":["Grazie"],"this page":["questa pagina"]},"Tooltip":{"More information":["Ulteriori informazioni"]},"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.":["Puoi creare fino a 20 calendari cifrati personalizzati e condivisibili. Puoi inoltre aggiungere fino a 5 calendari di amici, familiari, colleghi e organizzazioni."]},"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.":["Accedi a contenuti bloccati e naviga in modalità privata. Il piano include più di ${ TOTAL_SERVERS } server in oltre ${ TOTAL_COUNTRIES } Paesi, massima velocità della VPN, ${ TOTAL_VPN_CONNECTIONS } connessioni alla VPN, servizi di streaming in tutto il mondo, anti-malware, ad-blocker e altro ancora."],"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.":["Accedi a contenuti bloccati e naviga in modalità privata. Il piano include più di ${ TOTAL_SERVERS } server in oltre ${ TOTAL_COUNTRIES } Paesi, massima velocità della VPN, 10 connessioni alla VPN, servizi di streaming in tutto il mondo, anti-malware, ad-blocker e altro ancora."]},"version_history_label":{"Version history":["Cronologia delle versioni"]},"version_history_tooltip":{"Store up to ${ versionHistoryNumber } versions of each file for up to ${ years } years":["Conserva fino a ${ versionHistoryNumber } versioni di ciascun file fino a un massimo di ${ years } anni"]},"vpn_features_link":{"View VPN plans":["Visualizza i piani VPN"]},"vpn_features_useCase":{"Access blocked content and browse privately":["Accedi ai contenuti bloccati e naviga in modalità privata"]}}},"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
window.frameworkContext = frameworkContext;
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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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