Attribute-based encryption: Difference between revisions

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== Types of attribute-based encryption schemes ==

There are mainly two types of attribute-based encryption schemes: Key-policy attribute-based encryption (KP-ABE)<ref name=":0" /> and ciphertext-policy attribute-based encryption (CP-ABE).<ref>{{Cite book|last1=Bethencourt|first1=J.|last2=Sahai|first2=A.|last3=Waters|first3=B.|date=2007-05-01|title=Ciphertext-Policy Attribute-Based Encryption|journal=2007 IEEE Symposium on Security and Privacy (SP '07) |chapter=Ciphertext-Policy Attribute-Based Encryption |date=2007-05-01|pages=321–334|doi=10.1109/SP.2007.11|isbn=978-0-7695-2848-9|citeseerx=10.1.1.69.3744|s2cid=6282684 }}</ref>

In KP-ABE, users' secret keys are generated based on an access tree that defines the privileges scope of the concerned user, and data are encrypted over a set of attributes. However, CP-ABE uses access trees to encrypt data and users' secret keys are generated over a set of attributes.