Resilio Sync Key _top_ May 2026

A Resilio Sync key (formerly known as a "secret") is a unique, alphanumeric string used to link folders across different devices without relying on third-party cloud storage. Because Resilio Sync uses peer-to-peer (P2P) technology, these keys act as the essential bridge that allows your devices to find and securely communicate with each other. Types of Resilio Sync Keys

Resilio Sync utilizes different key types to manage how data is accessed and shared. You can identify the key type by its first letter:

Read-Write Key (Starts with 'A'): Grants full access to sync, add, modify, or delete files within a folder.

Read-Only Key (Starts with 'B'): Allows a device to download files but prevents it from uploading changes back to other peers. resilio sync key

Identity Key (Starts with 'M'): Used for "Linking My Devices," allowing all your folders to automatically sync across your own hardware without needing individual folder keys.

Encrypted Key (Starts with 'F'): Typically used for untrusted nodes (like a rented server). The device can store and seed data but cannot decrypt filenames or file content.

One-Time Use Key: A temporary key that expires after a single use or a set time, enhancing security for one-off shares. Folder Share Keys vs. License Keys A Resilio Sync key (formerly known as a

It is important to distinguish between folder-specific keys and license keys: File Sync with Resilio

Troubleshooting Common Key Issues

Key types (summary)

Read & Write (full) — full sync and edit access.
Read-Only — can download/receive files but cannot modify or upload changes back.
Encrypted (one-way) — an encrypted read-only key used for one-way backup to an untrusted peer (peer stores only encrypted blocks).
Time-limited / use-limited — keys can be created with expiration or limited uses (if set when generated).

On Mobile (iOS / Android)

Tap the folder you wish to share.
Tap the Share icon (usually a square with an arrow).
Select "Copy Encrypted Key" or "Copy Read Only Key" . (Note: Full Access keys are rarely shared via mobile for security reasons).

Part 5: Critical Warning – The "Key Lost = Data Lost" Rule

This is the single most important paragraph in this article. Resilio Sync is not a cloud service. There is no "Forgot Password" button.

If you lose the Full Access Key to a folder, and you lose all devices connected to that folder, the data is gone forever. Troubleshooting Common Key Issues Key types (summary)

Resilio does not have a copy of your keys. The company cannot recover your folder for you.

Resilio Sync Key vs. Modern Alternatives