"Chaffing and winnowing in molecular biology" Ronald L. Rivest's method for hiding information by breaking it in to packets mixed with other meaningless packets is similar to an approach which is used in organic systems, at the DNA level. In our bodies, packets of meaningful information from the DNA used for encoding protein sequences, called exons, are mixed with meaningless stretches of DNA, called introns. Certain rules exist for putting protein coding sequences together which are based on information around the intron/exon border. The analogy between cryptographic techniques and biological processes at the genetic level are striking. I believe that principles of protien coding may be useful to the cryptographic community. In turn, the principles and methods used by the cryptographic community may be useful to those who are analysing DNA sequences which are available and are becoming available from the Human Genome Project and other non-human Genome projects. Dmitry Goldgaber