Data encryption over ethernet...

Does anyone know of a method/product for encrypting sensitive data over a public ethernet.

This may not be the best group to post to, so I will accept replies along the lines of "this is not the correct group to post to", as long as they indicate what the correct group might be.

Thanks for your time, Michael.

-- 
Michael Collier (Programmer)                           The Computer Unit,
Email: M.P.Collier_at_city.ac.uk                          The City University,
Tel: 071 477-8000 x3769 (general) or x8199 (MAC)       London,
Fax: 071 477-8565                                      EC1V 0HB,