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_VPN_SERVERS }+ servers in ${ TOTAL_VPN_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 mais de ${ TOTAL_VPN_SERVERS } servidores em mais de ${ TOTAL_VPN_COUNTRIES } países, conexão com até 10 dispositivos, acesso a serviços de streaming do mundo todo, um bloqueador de anúncios e malware 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":{"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 ${ issues[0] }."],"We are experiencing issues with one or more services at the moment.":["No momento, estamos com problemas em um ou mais serviços."]},"Status Banner":{"At the moment we are experiencing issues with the Proton VPN service":["No momento estamos enfrentando problemas com o serviço Proton VPN"],"Learn more":["Saiba mais"]},"suggestions":{"Suggestions":["Sugestões"]},"Support":{"Sub category":["Subcategoria","Subcategorias"]},"Support article":{"${ 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 troubleshooting":{"App version":["Versão do aplicativo"],"Browser":["Navegador"],"Check if this helps":["Confira se isso ajuda"],"Choose a product":["Selecione um produto"],"Did this solve your issue?":["Isso resolveu seu problema?"],"Faster assistance is just a few clicks away":["Assistência mais rápida a apenas alguns cliques de distância"],"How can we help?":["Como podemos ajudar?"],"No, contact support":["Não, entrar em contato com o suporte"],"Please fill out one field after another":["Preencha os campos em sequência"],"Please make your selections":["Faça suas seleções"],"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"],"What can we help with?":["Com o que podemos ajudar?"],"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":{"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_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.":["Acesse conteúdo bloqueado e navegue com privacidade. Inclui mais de ${ TOTAL_VPN_SERVERS } servidores em mais de ${ TOTAL_VPN_COUNTRIES } países, a maior velocidade de VPN, ${ TOTAL_VPN_CONNECTIONS } conexões VPN, serviços de streaming do mundo todo, bloqueador de anúncios e malware 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 ${ years } anos"]},"wallet_signup_2024: Wallet app":{"Store and transact Bitcoin privately with an encrypted self-custody wallet.":["Guarde e negocie bitcoins de modo privado usando uma carteira com autocustódia criptografada."]},"wallet_signup_2024:Action":{"Get Proton Wallet":["Obtenha o Proton Wallet"]},"wallet_signup_2024:Homepage hero product link title":{"Wallet":["Wallet"]},"wallet_signup_2024:Homepage product navigation bar":{"Wallet":["Wallet"]},"wallet_signup_2024:menu item":{"Bitcoin guide":["Guia sobre bitcoins"],"Proton Wallet news":["Novidades do Proton Wallet"],"Proton Wallet support":["Suporte do Proton Wallet"],"Wallet features":["Recursos do Wallet"]},"wallet_signup_2024:Plan Feature":{"${ maxAccountsWallet } account per wallet":["${ maxAccountsWallet } conta por carteira","${ maxAccountsWallet } contas por carteira"],"${ maxAddresses } Proton Mail email address":["${ maxAddresses } endereço de e-mail do Proton Mail","${ maxAddresses } endereços de e-mail do Proton Mail"],"${ maxWallets } wallet":["${ maxWallets } carteira","${ maxWallets } carteiras"],"Access to Proton Sentinel, maximum protection for your account using human analysis with machine learning.":["Acesse o Proton Sentinel, proteção máxima para sua conta usando análise humana com aprendizado de máquina."],"Bitcoin via email":["Bitcoin via e-mail"],"Early access to new features":["Acesso antecipado a novos recursos"],"Encrypted and secure email. You can easily send Bitcoin to anyone with just their Proton name.":["E-mail criptografado e seguro. Envie bitcoins facilmente para qualquer pessoa usando apenas o nome do usuário na Proton."],"Encrypted email with ${ maxMailSpaceFormatted } storage":["E-mail criptografado com ${ maxMailSpaceFormatted } de armazenamento"],"Link up to ${ maxAddresses } email address":["Vincule até ${ maxAddresses } endereço de e-mail","Vincule até ${ maxAddresses } endereços de e-mail"],"Securely exchange Bitcoin via email instead of complex, 26 character Bitcoin address. Transacting Bitcoin is as easy as hitting send.":["Troque bitcoins com segurança por e-mail em vez de usar endereços complexos de bitcoins de 26 caracteres. Negociar bitcoins é tão fácil como pressionar o botão \"Enviar\"."]},"wallet_signup_2024:Pricing":{"Includes everything in Proton Unlimited and":["Inclui todos os recursos do Proton Unlimited e"],"Limited availability":["Disponibilidade limitada"],"The easiest way to securely own, send, and receive Bitcoin":["A maneira mais fácil de guardar, enviar e receber bitcoins com segurança"]},"wallet_signup_2024:ProductRange":{"Discover Proton Wallet":["Conheça o Proton Wallet"],"Proton Wallet":["Proton Wallet"],"Store and transact Bitcoin privately with an encrypted self-custody wallet.":["Guarde e negocie bitcoins de modo privado usando uma carteira com autocustódia criptografada."]},"wallet_signup_2024:Wallet app":{"Store and transact Bitcoin privately with an encrypted self-custody wallet.":["Guarde e negocie bitcoins de modo privado usando uma carteira com autocustódia criptografada."]},"wallet_signup_2024:wallet bitcoin":{"Learn about Bitcoin, the Internet's value network.":["Saiba mais sobre bitcoins, a rede de valor da internet."]},"wallet_signup_2024:wallet overview":{"Ensure you're always in control of your Bitcoin.":["Tenha certeza de ter sempre o controle das suas bitcoins."]},"wallet_signup_2024:wallet security":{"The encrypted, open-source wallet that puts you in control.":["A carteira criptografada e de código aberto que coloca você no controle."]}}},"base":"blog","imageCDNEnabled":false,"cdnUrl":"https://pmecdn.protonweb.com/","unleashApi":"https://account.proton.me/api","cdn":{"enabledForImages":false,"enabledForAssets":true,"url":"https://pmecdn.protonweb.com/"}};
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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(new window) 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(new window). 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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