all-in-one privacy solution":["Proton Unlimited es una solución de privacidad todo en uno"],"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 ${ BLACK_FRIDAY } de Proton Mail"],"The world’s only community- supported email service":["El único servicio de correo electrónico financiado la comunidad"]},"specialoffer:limited":{"${ 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 ${ SAVE_SUM }"]},"specialoffer:off":{"${ 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"],"Safe from trackers":["Evita los rastreadores"],"Stay organized":["Mantén el 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"],"Make your inbox yours":["Toma posesión de tu bandeja de entrada"],"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_VPN_SERVERS }+ servers in ${ TOTAL_VPN_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_VPN_SERVERS } servidores en más de ${ TOTAL_VPN_COUNTRIES } países. Conecta hasta 10 dispositivos, accede a servicios de streaming de todo el mundo, 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"]},"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 ${ issues[0] } está dando problemas de funcionamiento."],"We are experiencing issues with one or more services at the moment.":["Uno o varios servicios están dando problemas de funcionamiento en estos momentos."]},"steps":{"Step":["Paso"]},"suggestions":{"Suggestions":["Sugerencias"]},"Support":{"Sub category":["Subcategoría","Subcategorías"]},"Support article":{"${ 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 Form Platform option":{"VPN for Android TV":["VPN para Android TV"],"VPN for Apple TV":["VPN para Apple TV"],"VPN for Chromebook":["VPN para Chromebook"]},"Support troubleshooting":{"App version":["Versión de la aplicación"],"Browser":["Navegador"],"Check if this helps":["Comprueba a ver si te sirve"],"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":["Solo te separan unos clics de una asistencia más rápida"],"How can we help?":["¿Cómo podemos ayudarte?"],"No, contact support":["No, contactar con el equipo de asistencia"],"Please fill out one field after another":["Rellena un campo después de otro"],"Please make your selections":["Realiza tus selecciones"],"Proton account":["Cuenta de Proton"],"Proton for Business":["Proton for Business"],"Thank you for your feedback":["Gracias por tus comentarios"],"What can we help with?":["¿En qué 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"]},"Testimonial":{"Awards":["Premios"],"Customers":["Clientes"],"Featured":["Destacado"],"Go to testimonial source":["Ir a la fuente del testimonio"],"Open source of award":["Fuente disponible del premio"],"Open source of quote":["Fuente disponible del testimonio"],"Reviews":["Opiniones"],"Videos":["Vídeos"],"Watch on TikTok":["Ver en TikTok"],"Watch on YouTube":["Ver en YouTube"]},"TestimonialCategory":{"Awards":["Premios"],"Customers":["Clientes"],"Featured":["Destacado"],"Media":["Medios"],"Reviews":["Opiniones"],"Videos":["Vídeos"]},"Text":{"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."],"Your question may already have an answer in our knowledge base:":["Puede que haya respuesta a tu pregunta en nuestra base de conocimientos:"]},"Title":{"On this page":["En esta página"],"Page not found":["No se encontró la página"],"Related articles":["Artículos relacionados"],"Share ${ thisPage }":["Compartir ${ thisPage }"],"Switch to Proton Pass - Contact us":["Cambia a Proton Pass - Contáctanos"],"Thank you!":["¡Gracias!"],"this page":["esta página"]},"tooltip_vpn":{"Access blocked content and browse privately. Includes ${ TOTAL_VPN_SERVERS }+ servers in ${ TOTAL_VPN_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. 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What is end-to-end encryption and how does it work? | Proton
The most private and secure way to communicate online is by using end-to-end encryption. If you send an end-to-end encrypted email, it’s encrypted on your device (your iPhone, Android, or laptop) and isn’t decrypted until it reaches the device of the person you sent the message to.
End-to-end encryption (E2EE) has historically been very complicated, which limited who could effectively use it. An early iteration of E2EE for email, known as Pretty Good Privacy (PGP), required you to handle the encryption keys yourself, making it notoriously difficult even for tech-savvy users.
However, recent technological advances in device capabilities and secure protocols have enabled services (such as Proton Mail) to make end-to-end encryption much easier to use. In fact, Proton Mail handles all end-to-end encryption automatically – you don’t need to do anything.
This article explains what end-to-end encryption is, how it works, and its advantages over other types of encryption.
Encryption is the process of scrambling data that people can read (for example, a plaintext email) into unreadable ciphertext that only authorized parties can decrypt using the right cryptographic key.
End-to-end encryption is the term used for a type of encryption where your data is encrypted at every stage of its journey from one device to another. The ends in “end-to-end” refer to the beginning and final destination of your data’s journey. For example, if you’re sending an email, the beginning point is your device and the destination is your recipient’s device.
This makes end-to-end encryption a secure communication method that prevents all third parties from accessing the content of your messages, including while they are transferred from one device to another or “at rest” on a server. When you use E2EE to send an email to someone, no one else can see the content of your message — not your network administrator, not your internet service provider (ISP), not hackers, not the government, and not even the company that handles the delivery of your email (for example, Proton Mail). They can’t read your email because your recipient holds the only key that can decrypt it.
How does end-to-end encryption work?
To understand how end-to-end encryption works for email, it helps to look at a diagram. In the example below, Bob wants to say hello to Alice privately. Alice has a public key and a private key, which are two mathematically related cryptographic keys. Alice can share her public key with anyone, but she must keep her private key secure and not let anyone else access it.
First, Bob uses Alice’s public key to encrypt his message, turning “Hello Alice” into ciphertext — scrambled, seemingly random characters.
Bob sends this encrypted message over the public internet. Along the way, it may pass through multiple servers, including those belonging to their email service and internet service providers. Although those companies may try to read the message (or even share it with third parties), it is computationally unfeasible for them to convert the ciphertext back into readable plaintext. Only Alice can decrypt the message with her private key when it lands in her inbox, as Alice is the only person with access to her private key.
If Alice wants to reply with her own end-to-end encrypted message, she would repeat the process, encrypting her message to Bob using Bob’s public key.
What is the difference between E2EE and other security paradigms?
End-to-end encryption is unique compared to other security paradigms because only the sender and receiver (the “ends” of the communication) can decrypt and read the data that has been encrypted. This differs from other security paradigms, such as point-to-point or in-transit encryption like the Transport Layer Security (TLS) protocol.
TLS is the security mechanism used in the HTTPS communication protocol that prevents hackers and your ISP(ventana nueva) from seeing what information you submit to websites (like your credit card number or address) and is responsible for encrypting most of the internet, including your connection to our blog right now. However, TLS is only implemented between endpoints of an HTTP channel. For example, as you’re reading our blog, HTTPS is using TLS to encrypt your connection between your device and our server.
This works fine if you are connecting to a website, but it’s insufficient if you’re sending an email. When you use a standard email provider, such as Gmail or Hotmail, all traffic toward it, including emails sent to you, will be protected in transit by TLS. The same is true in reverse; Emails you send from a standard email provider are also encrypted using TLS and sent to your recipient’s email provider . However, all TLS-protected traffic is decrypted once it arrives at these companies’ servers, including your emails. Most companies will then re-encrypt your messages while they are stored on their servers – using keys they control. This means that the company can decrypt and access the content of your messages at any time.
Services that use end-to-end encryption eliminate this possibility because the service provider does not actually possess the private key required for decryption. With Proton Mail or any other E2EE service, your private key is only available on your device, making E2EE much more secure and private.
Advantages of end-to-end encryption services
End-to-end encryption offers multiple advantages over other security paradigms. Protecting your data with E2EE makes you less vulnerable to leaks or attacks, prevents your government or ISP from snooping on you, and even helps defend democracy.
E2EE keeps your data safe from hacks
When you use end-to-end encryption, fewer parties can access your unencrypted data. Even if hackers compromised the servers where your encrypted data is stored (as was the case with the Yahoo Mail hack), they would not be able to decrypt your data because they would not possess your private key.
E2EE ensures data is not tampered with
When set up correctly, end-to-end encryption guarantees data integrity across the whole path of a message. This is particularly important when sharing information that might not be sensitive but must be delivered correctly in its original form.
E2EE keeps your data private
End-to-end encryption prevents anyone from accessing your data, including the email service you are using. In contrast, if you use an email service that does not use end-to-end encryption, such as Gmail, it can access every intimate detail stored in your emails at any time, for any reason, without you ever knowing. In fact, Gmail regularly gives third-party developers access to your emails(ventana nueva). Using an end-to-end encrypted email service gives you control over who can read your emails.
E2EE is good for democracy
Everyone has a right to privacy. End-to-end encryption protects free speech by preventing governments from accessing their citizens’ data and using the information stored in their emails to persecute or intimidate them. This is particularly important for dissidents, activists, and journalists who live under oppressive regimes.
How to use end-to-end encryption
Although you can set up end-to-end encryption yourself for some methods of communication, the easiest and fastest way to protect your privacy with E2EE is to use a service that implements it automatically for you.
As the first and largest end-to-end encrypted email provider, we protect millions of people every day. End-to-end encryption is the technological backbone of our vision for a more private and secure internet. When you use Proton Mail, your messages are automatically end-to-end encrypted whenever a public key is available for the recipient, including when you send an email to someone who uses Proton Mail or PGP.
You can use end-to-end encryption for free by signing up for a free Proton Mail account. With Easy Switch, you can also quickly transfer your emails and calendars to Proton from other, less private providers.
End-to-end encryption FAQs
What is ciphertext?
Ciphertext is unreadable encrypted data. An encryption algorithm scrambles plaintext (or human-readable data) into ciphertext, which can only be deciphered by a person or device that holds the unique decryption key. Without the decryption key, anyone who intercepted an encrypted message would only see ciphertext — an unreadable string of letters, numbers, and symbols.
What is encrypted with end-to-end encryption?
When you send an end-to-end encrypted message with Proton Mail, the message body and attachments are fully end-to-end encrypted whenever a public key is available for the recipient. If you email a contact who isn’t using Proton Mail or PGP, the message will only be end-to-end encrypted if you use our Password-protected Emails feature. Otherwise, your message will be encrypted in transit (in most cases) with TLS and will be readable by your recipient’s email provider. Proton Mail encryption explained
What are encryption keys?
An encryption key is a random string of bits used by an encryption algorithm to scramble plaintext into ciphertext. Some types of encryption use the same encryption key to encrypt and decrypt data (this is symmetric encryption), while others will have an encryption and a decryption key (this is asymmetric encryption). However, the most common encryption methodology is a combination of both, called hybrid encryption. Proton Mail’s end-to-end encryption protocol uses hybrid encryption.
What is PGP?
The most popular email encryption system in the world is PGP, which stands for Pretty Good Privacy. PGP is the encryption technique that transforms your messages into unintelligible ciphertext on your device before they are transmitted over the internet. Additionally, it verifies that the message was not altered while in transit and, if keys are obtained from a trustworthy source, it authenticates the sender’s identity. Proton Mail’s end-to-end encryption is based on an open-source version of PGP. Learn more about PGP
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