A blind signature is a cryptographic concept that allows a party to sign a message without knowing its content. This process enhances privacy by ensuring that the signer does not see the message they are signing.

In practice, the party wanting a signature first blinds the message by applying a transformation, making it unreadable. They then send this blinded message to the signer, who signs it without knowing what it contains.

After receiving the signed message back, the original party can unblind it, revealing a valid signature for the original content. This technique is useful in various scenarios, such as voting systems or anonymous transactions, where participants seek to prove authenticity without exposing their identity or message details.

By employing blind signatures, users can enhance their privacy while still ensuring the integrity of their transactions or communications.