International Association
for Cryptologic Research

Computational privacy is a property of cryptographic

system that ensures the privacy of data (and/or operations)

while being processed at an untrusted server. Cryptography

has been an indispensable tool for computer security but its

readiness for this new generational shift of computing platform

i.e. Cloud Computing is still questionable.

Theoretical constructions like Fully Homomorphic Encryption,

Functional encryption, Server aided Multiparty Computation,

Verifiable Computation, Instance Hiding etc. are few

directions being pursued. These cryptographic techniques solve

Cloud privacy problems at different levels but most of them dont

fit well in overall scheme of things.

We state the privacy requirements for Cloud offerings in

various delivery methods. We discuss the challenges with current

cryptographic techniques being pursued by researchers and show

that they dont cater to blanket cover these privacy requirements.

We urge the need to find generalizations and connections

among these isolated techniques. As this might give more insights

into the underpinnings of Computational Privacy and lead to

better solutions.