Key-policy attribute-based encryption (KP-ABE) is a type of ABE that links access policies with a decryption key instead of ciphertext. The ciphertext can only be decrypted if its key attributes are associated with the specified policy.

How Key-Policy Attribute-Based Encryption Works

Similar to traditional ABE, KP-ABE uses attributes as conditions to access protected data. Usually, these attributes are associated with the user. For instance, they may refer to the user’s rank in their workplace. However, unlike traditional ABE, KP-ABE’s decryption key contains an access policy rather than a ciphertext.

Every user is assigned a key based on their attributes, and the key includes a policy that defines the attributes needed for decryption. If a user wants to decrypt data, they must input a decryption key to the system. The system will grant access only if the user’s attributes match the access policy associated with the key.

Applications of Key-Policy Attribute-Based Encryption

Challenges of Key-Policy Attribute-Based Encryption