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Client-side encryption is the cryptographic technique of encrypting data on the sender's side, before it is transmitted to a server such as a cloud storage service. [1] Client-side encryption features an encryption key that is not available to the service provider, making it difficult or impossible for service providers to decrypt hosted data.
In other words, an email sent with end-to-end encryption would be encrypted at the source, unreadable to service providers like Gmail in transit, and then decrypted at its endpoint. Crucially, the email would only be decrypted for the end user on their computer and would remain in encrypted, unreadable form to an email service like Gmail, which ...
Skiff offers client side encryption, [165] schedule send, undo send, multiple aliases, crypto wallet aliasing, email import, custom signatures, auto replies, and email filters. Skiff Mail also integrates with an end-to-end encrypted work suite with notes, drive storage, and a calendar with video conferencing.
Some email services integrate end-to-end encryption automatically. OpenPGP is a data encryption standard that allows end-users to encrypt the email contents. There are various software and email-client plugins that allow users to encrypt the message using the recipient's public key before sending it.
Some encrypted backup and file sharing services provide client-side encryption. This type of encryption is not referred to as end-to-end encryption because only one end has the ability to decrypt the data. However, the term "end-to-end encryption" is sometimes incorrectly used to describe client-side encryption. [29]
Unlike other popular email services such as Gmail and Outlook, it uses client-side encryption to safeguard email content and user data before it is delivered to ProtonMail servers.
To cryptographically protect IMAP connections between the client and server, IMAPS on TCP port 993 can be used, which utilizes SSL/TLS. [2] [3] As of January 2018, TLS is the recommended mechanism. [20] Alternatively, STARTTLS can be used to encrypt the connection when connecting to port 143 after initially communicating over plaintext.
Transport Layer Security (TLS) is a cryptographic protocol designed to provide communications security over a computer network, such as the Internet.The protocol is widely used in applications such as email, instant messaging, and voice over IP, but its use in securing HTTPS remains the most publicly visible.