Heimdal is a free implementation of Kerberos 5, that aims to be compatible with MIT Kerberos and is backwards compatible with Kerberos 4. Kerberos is a network authentication protocol. Basically it preserves the integrity of passwords in any untrusted network (like the Internet). Kerberized applications work hand-in-hand with sites that support Kerberos to ensure that passwords cannot be stolen. A Kerberos installation will make changes to the authentication mechanisms on your network and will overwrite several programs and daemons from the Coreutils, Inetutils, Qpopper and Shadow packages. Download (HTTP): Download (FTP): Download size: &heimdal-size; Estimated Disk space required: &heimdal-buildsize; Estimated build time: &heimdal-time; Required patch: and , , or , and krb4 Some sort of time synchronization facility on your system (like ) is required since Kerberos won't authenticate if the time differential between a kerberized client and the KDC server is more than 5 minutes.