End-to-end encryption
End-to-end encryption (E2EE) encrypts data on the sender's device and decrypts it only for the recipient, so intermediaries see only ciphertext. Learn how it works.
End-to-end encryption (E2EE) is a method where data is encrypted on the sender's device and decrypted only by the intended recipient, with no readable copy at any point in between. Intermediaries that relay or store the data, including the service provider and the network, see only ciphertext and cannot access the plaintext.
How it works
In end-to-end encryption, the endpoints hold the keys and the middle does not. The sender encrypts data locally before it leaves the device, the ciphertext travels across networks and through servers, and only an authorized recipient with the right key decrypts it. This contrasts with transport encryption like TLS, which protects data in transit but leaves it readable on the server. E2EE is most familiar from secure messaging, but the same model applies to storage and secrets: values are encrypted client-side, synced as ciphertext, and decrypted only by authorized users or processes. Strong E2EE pairs in-transit protection like TLS with at-rest ciphertext the provider cannot read.
End-to-end encryption for secrets
Applied to secrets management, end-to-end encryption means environment variables are encrypted on a developer's machine before upload and decrypted only on authorized devices or in authorized runtimes. The server stores and syncs ciphertext but never sees plaintext, which is the core of a zero-trust approach. Envless works this way: variable values are encrypted client-side before they reach the server, TLS protects them in transit, and encrypted copies are replicated across multiple cloud providers for durability without ever exposing the plaintext. Combined with passwordless sign-in and role-based access, this keeps secrets readable only to the people and systems that need them.
Related terms
End-to-end encryption FAQ
No. TLS encrypts data in transit between a client and a server, but the server can read the plaintext once it arrives. End-to-end encryption keeps data encrypted past the server, so only the endpoints can decrypt it and intermediaries see only ciphertext.
They overlap closely. End-to-end encryption describes data being readable only at the endpoints; zero-knowledge encryption emphasizes that the provider holds no keys and therefore knows nothing about the contents. A system can be both: encrypt at the client, and never give the server access to keys.
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