Shishi is a (still incomplete) implementation of the RFC 1510 and RFC 1510bis network authentication system. RFC 1510 can be used to authenticate users in distributed systems. Shishi contains a library ('libshishi') that can be used by application developers to add support for RFC 1510. Shishi contains a command line utility ('shishi') that is used by users to interface with the library, to acquire and manage tickets (and more). Included are also a TELNET client and server (based on GNU InetUtils) for remote network login, and a PAM module for host security. Of course, a manual documenting user aspects as well as the programming API is included. Shishi currently supports AS/TGS exchanges for acquiring tickets, and the AP exchange for performing client and server authentication. Shishi is internationalized; error and status messages can be translated into the users' language; username and passwords can be converted into any available character set (normally including ISO-8859-1 and UTF-8) and be processed using an experimental Stringprep profile. The des-cbc-md4, des-cbc-md5, des3-cbc-sha1-kd, aes128-cts-hmac-sha1-96, and aes256-cts-hmac-sha1-96 encryption types, and the rsa-md4-des, rsa-md5-des, hmac-sha1-des3-kd, hmac-sha1-96-aes128, hmac-sha1-96-aes256 checksum types are supported. The internal source code layout of Shishi is illustrated in . It is primarily intended for Shishi developers, but may assist in getting a in-depth understanding of the API.