
The 9 revised full papers presented were carefully reviewed and selected for presentation. This book is the first archival publication devoted to the new class of security protocols called human interactive proofs. The variant of HIPs being used in e-commerce and Web services today is completely automatic public Turing tests to tell computers and humans apart, CAPTCHAs. The papers in this book are organized in topical sections on CAPTCHAs and performance analysis, HIP architectures, HIP as security systems components.
| douglas hyde nicola jenkins state b california state board of trade vickie l buchanan wally lamb | r kevin hennelly e a coddington allison amend terry o brien s r a beisner |