End-to-end encryption is a security protocol that ensures that email messages and file attachments are encrypted the entire length of the file transfer, so only the sender and message recipient can read its contents. This is achieved by encrypting the message or file at the sender’s device before it is sent, and then decrypting it at the recipient’s device instead of at the sender’s or recipient’s firewall. This means that even if a message is intercepted by a third party, they won’t be able to read its contents. End-to-end encryption can be used to protect a law firm’s internal and client communications and related files by using secure messaging apps, email services, or file sharing platforms that support this protocol.