Most likely about the idea of KP-ABE ("key-policy attribute-based
encryption") see "Attribute-based encryption for fine-grained access
control of encrypted data" by Goyal, et al.
http://eprint.iacr.org/2006/309.pdf

Also, he could have been talking about "Ciphertext-policy
attribute-based encryption" (CP-ABE). There has been some work done on
this during 2007-08 (see Oakland 2007, a paper by Bethencourt et al. I
believe there's also a paper in ICALP 2008).

Best would be to directly mail Sahai and ask him.

Hope this helps.
Amitabh


On Fri, May 23, 2008 at 4:04 PM, Sarad AV <jtrjtrjtr2001@...> wrote:
> http://news.bbc.co.uk/1/hi/technology/7409303.stm
>
> Is anyone having a better reference to what this is about?
>
>



--
Amitabh Saxena
Department of Information and Communication Technology
University of Trento, Italy
http://dit.unitn.it/~amitabh/

GPG public key http://dit.unitn.it/~amitabh/amitabh.txt
Fingerprint 083A C786 EE27 DD9D 0493 FFD2 C8B5 6FA8 6CED B0EC