[rfc-dist] RFC 4757 on The RC4-HMAC Kerberos Encryption Types Used by Microsoft Windows

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        RFC 4757

        Title:      The RC4-HMAC Kerberos Encryption Types 
                    Used by Microsoft Windows 
        Author:     K. Jaganathan, L. Zhu,
                    J. Brezak
        Status:     Informational
        Date:       December 2006
        Mailbox:    karthikj at microsoft.com, 
                    lzhu at microsoft.com, 
                    jbrezak at microsoft.com
        Pages:      18
        Characters: 36562
        Updates/Obsoletes/SeeAlso:   None

        I-D Tag:    draft-jaganathan-rc4-hmac-03.txt

        URL:        http://www.rfc-editor.org/rfc/rfc4757.txt

The Microsoft Windows 2000 implementation of Kerberos introduces a
new encryption type based on the RC4 encryption algorithm and using
an MD5 HMAC for checksum.  This is offered as an alternative to using
the existing DES-based encryption types.

The RC4-HMAC encryption types are used to ease upgrade of existing
Windows NT environments, provide strong cryptography (128-bit key 
lengths), and provide exportable (meet United States government export
restriction requirements) encryption.  This document describes the
implementation of those encryption types.  This memo provides information 
for the Internet community.


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