A popular counterexample directed against externalist epistemological views is that of an agent (Lehrer's "Truetemp" for example) whose beliefs are clearly neither justified nor known but that were generated in the manner that the externalist requires, thereby demonstrating externalism to be insufficient. In this essay I develop and defend an externalist account of knowledge – essentially an elaboration of Fred Dreske's information-theoretic account – that is not susceptible to those criticisms. I then briefly discuss the relationship between knowledge and justification.