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> The worrisome item was the statement that the copiers would add > some sort of unspecified marking to each copy made, allowing copies > to be traced back to their source. Steganographic signatures. Similarly, signatures are being put into explosives (although they are somewhat traceable already) by using various mixtures of trace elements. Paul E. Baclace peb@procase.com
> Steganographic signatures. Similarly, signatures are being put into > explosives (although they are somewhat traceable already) by using > various mixtures of trace elements. I believe that they also use small (microscopic) color coded chips of plastic. There is an OTA report on this topic with a name something like "Taggants in Explosives". I believe that the report is about 10 years old.
> > > Steganographic signatures. Similarly, signatures are being put into > > explosives (although they are somewhat traceable already) by using > > various mixtures of trace elements. > > I believe that they also use small (microscopic) color coded chips of > plastic. There is an OTA report on this topic with a name something > like "Taggants in Explosives". I believe that the report is about 10 > years old. > > I remember hearing about how one congress member removed the taggants from a sample of gunpowder using tweezers during a terrorism hearing. Taggants can't really be relied upon. Doug