didentd is a modular RfC1423 (identd) server for FreeBSD and Linux written with security in mind. The Server normally runs chrooted under /proc/net on an unprivileged id. Normally didentd does not send an username but an encrypted audit token to the client. This token contains all information about the requested connection: userid owning the connection, source ip:port, destination ip:port, a timestamp. If a remote admin has a complaint about something from your machine he can send this audit token back to you, you can pipe it through didentd-decrypt and find out which user did the connection. didentd-decrypt outputs all the information from the audit token. So you can have the benefit of ident without revealing internal information from your system. There is also didentd-name which is a server returning the username of the uid owning the requested connection. This is the classic ident approach. didentd-static is a server which delivers a fixed reply defined by the administrator to every request.