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Reuse USM?
Problems with mapping the pair msgAuthoritativeEngineID:msgUserName to session identifier (how to distinguish multiple sessions that have the same engineID:name pair)
Problems with clock (msgAuthoritativeEngineBoots: msgAuthoritativeEngineTime) (see previous page)
However, can reuse msgAuthenticationParameters and msgPrivacyParameters, and crypto procedures associated with values for usmUserAuthProtocol and usmUserPrivProtocol
PPT Version