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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.
== Relationship to
The related concept of [[role-based encryption]]<ref name="SuryakantBhise R.N pp. 15–20">{{cite journal | last1=SuryakantBhise | first1=Avdhut | last2=R.N | first2=Phursule | title=A Review of Role based Encryption System for Secure Cloud Storage | journal=International Journal of Computer Applications | publisher=Foundation of Computer Science | volume=109 | issue=14 | date=2015-01-16 | issn=0975-8887 | doi=10.5120/19255-0986 | pages=15–20| bibcode=2015IJCA..109n..15S | doi-access=free }}</ref> refers exclusively to access keys having roles that can be validated against an authoritative store of roles. In this sense, Role-based encryption can be expressed by Attribute-based encryption and within that limited context the two terms can be used interchangeably. Role-based Encryption cannot express Attribute-based encryption.
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