This paper introduces a cryptographic engine, Janus, which assists clients in establishing
and maintaining secure and pseudonymous relationships with multiple servers. The setting
is such that clients reside on a particular subnet (eg, corporate intranet, ISP) and the servers
reside anywhere on the Internet. The Janus engine allows each client-server relationship to
use either weak or strong authentication on each interaction. At the same time, each
interaction preserves privacy by neither revealing a clients true identity (except for the …

This paper introduces a cryptographic engine, Janus, that assists clients in establishing and
maintaining secure and pseudonymous relationships with multiple servers. The setting is
such that clients reside on a particular subnet (eg, corporate intranet, ISP) and the servers
reside anywhere on the Internet. The Janus engine allows for each client-server relationship
to use either weak or strong authentication on each interaction. At the same time, each
interaction preserves privacy by neither revealing a client's true identity (\modulo" the …