# Is Order-preserving encryption part of the functional encryption family?

I believe I know quite well OPE and ORE, but I'm unsure about what family to put them in. Can we consider them as a sub family of Functional Encryption, like Attribute Based Encryption or Inner Product Encryption or are they a new paradigm of their own ?

• @Maeher I was going to comment that... FE for inner product suffers from more or less the same problem fgrieu pointed out: given a functional key for a hidden vector $v$, if one is able to encrypt several vectors $u_i$ by themselves, then they can decrypt several inner products $u_i \cdot v$ and then recover $v$ by linear algebra... So this type of FE for inner product is also secret key FE. Jun 28 at 8:48