IMAP/POP AUTHorize Extension for Simple Challenge/Response

摘要: While IMAP4 supports a number of strong authentication mechanisms as described in RFC 1731, it lacks any mechanism that neither passes cleartext, reusable passwords across the network nor requires either significant security infrastructure or mail server update mail-system-wide user file on each access. This specification provides simple challenge-response protocol is suitable for use with IMAP4. Since utilizes Keyed-MD5 digests and does not require secret be stored clear server, may also constitute an improvement APOP POP3 specified 1734.