| TABLE 1: IIS 5.0 Authentication Methods | ||||
| Authentication Method | Security Level | Server Requirements | Client Requirements | Comments |
| Anonymous | None | IUSR_computername or similar account | Any browser | Used for public areas of Internet sites |
| Basic | Low | Valid accounts on server | Enter username and password | Transmits password in clear text |
| Digest | High | Plain clear text copy of every password; valid accounts. | Browsers that support HTTP 1.1 | Usable across proxy servers and firewalls |
| Integrated Windows | High | Valid accounts | Browser support | Suitable for private areas of intranets |
| Certificate | High | Obtain server certificates and configure certificate trust lists (for first use only) | Browser support | Widely used for secure transactions over the Internet |
| FTP Anonymous | None | IUSR_computername or similar account | None | Used for public areas of FTP sites |
| FTP Basic | Low | Valid accounts on server | Enter username and password | Transmits password in clear text |