Kaon electroproduction on deuterium and hydrogen targets has been measured at beam energies of 3.245 and 2.445 GeV and momentum transfer Q2 = 0.38 and 0.5 (GeV/c)2. Associated Λ production off a proton in the deuteron exhibits a quasifree production mechanism. The electroproduction of a Σ− off the neutron could be extracted for the first time with reasonable errors.