Identity-based encryption
Identity-based encryption
Identity-based encryption (IBE) definition
Identity-based encryption (or IBE) is a method that encrypts messages with a user’s identity (like their email address) instead of a public key. IBE can be a great option when companies want to simplify encryption for the user. It is commonly used in secure email communication, access control systems, and messaging.
See also: AES encryption
How identity-based encryption works
- In most systems, a trusted authority called the Private Key Generator (PKG) manages all keys.
- When new users join, they provide their identity info (like email or username) to the PKG.
- The PKG creates a unique private key for each user using a master secret key and their identity. This private key is used for decryption.
- Senders encrypt messages using the recipient’s identity as the key — no need for the recipient’s public key.
- When the recipient receives the message, they ask the PKG for their private key. The PKG verifies the recipient and gives them the key.
- The recipient can decrypt the message and access its contents securely.
- The PKG also can revoke a user’s private key (for example, if it’s compromised).
Examples of IBE in use
- An insurance firm may use this encryption method to secure its email system.
- Universities may use IBE to manage access to various campus buildings.
- An instant messaging app may use identity-based encryption to let users communicate privately.
- A hospital may use IBE to securely access patient medical records.
- File-sharing services may use IBE to boost user security and privacy.