Authentication of sequences with the SL 2 hash function: application to video sequences

This paper presents an interesting application of the Tillich–Zémor function TZ . In particular, we emphasize the concatenation property of this one-way hash function. i.e., TZ ( S | T ) = TZ ( S ) TZ ( T ) where S and T are two binary strings. This property is combined with a multisignature scheme in a journalism context. The aim is to authenticate reports or interviews.