I am sometimes asked where I find the material that goes into these columns and whether it is difficult to write something new every month. When I started it was easy because I had a large stock of material accumulated over many years during which I did not write columns. And, yes it is becoming increasingly difficult as the stock has dwindled with the passage of time. I am always on the lookou...

All that said, this is still a book for dipping into. The American English is easily readable, and the tables are helpful. None the less, it defies the imagination to think that trainees in any clinical discipline should have to know that on chromosome 9 there are "genes in the breakpoint cluster region (bcr) of 22 cell lines established from CML expressing a new messenger RNA which reflects th...

This paper presents a recursive hiding scheme for 2 out of 3 secret sharing. In recursive hiding of secrets, the user encodes additional information about smaller secrets in the shares of a larger secret without an expansion in the size of the latter, thereby increasing the efficiency of secret sharing. We present applications of our proposed protocol to images as well as text.

A collaboration network is a graph formed by communication channels between parties. Parties communicate over these channels to establish secrets, simultaneously enforcing interdependencies between the secrets. The paper studies properties of these interdependencies that are induced by the topology of the network. In previous work, the authors developed a complete logical system for one such pr...