https://atosh502.github.io/tags/kp-abe/Recent content in Kp-Abe on Aashutosh PoudelHugoen-USCopyright © \b20\d{2}\b, Aashutosh Poudel.Mon, 13 Apr 2026 00:00:00 +0000https://atosh502.github.io/blog/til/2026/april/cp-abe-and-kp-abe/Mon, 13 Apr 2026 00:00:00 +0000https://atosh502.github.io/blog/til/2026/april/cp-abe-and-kp-abe/<p>A very basic overview of CP-ABE vs KP-ABE</p> <ul> <li> <p>Policy vs Attribute</p> <ul> <li>attribute describes a person/entity (something they are or they have)</li> <li>policy is a set of conditions a person/entity needs to satisfy with their attributes</li> <li>attributes can be compared to a key an entity has</li> <li>policy can be compared to a lock an encryptor decides</li> </ul> </li> <li> <p>Ciphertext-Policy Attributed Based Encryption (CP-ABE)</p> <ul> <li>policy is embedded inside the ciphertext, attributes are defined on the key</li> <li>Example: a student with their student id card (key with attributes: &ldquo;cs department&rdquo;, &ldquo;grad student&rdquo;) can only access a certain set of labs or classrooms (locks/ciphertexts with policy) within a school</li> <li>useful if the encryptor is a user/client who want to limit access to data</li> </ul> </li> <li> <p>Key-Policy Attributed Based Encryption (KP-ABE)</p>