LDAP v1 1993 (implemented in the University on Michigan)
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LDAP v2 1995 RFC 1777,1823,1959 (also implemented in the University of Michigan)
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strings based on ASCII characters rather than Unicode
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insecure, clear-text password-based authentication
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no extensibility
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LDAP v3 December 1997 RFC 2222, 2251-2256
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Unicode UTF-8 encoding replaced ASCII strings
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improves performance, scalability, security, support for international character sets
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security take advantage of X.509 strong authentication
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