David Freeman : 2012 Security Session

In recent years, "homomorphic encryption" has received much attention as a solution for protecting data confidentiality in the cloud. We consider the parallel problem of data *integrity* in the cloud. Specifically, if Alice uploads some data to the cloud that is processed by the server and then downloaded by Bob, how can Bob determine whether the result he receives is correct? "Homomorphic signatures" are a cryptographic tool that can solve this problem. In this talk we give an overview of homomorphic signatures and describe some recent advances in the field.

David Mandell Freeman is a Postdoctoral Scholar in the Applied Cryptography Group at Stanford. His research focuses on mathematical cryptography and computational number theory; specialties include elliptic curves, lattices, and systems for computing on encrypted or authenticated data.