(This resource is a trial version _ revised version V1.1, I look forward to your reference. 1 Scope This document specifies the basic requirements for the maintenance of information system security levels, including basic technical requirements and basic management requirements, and is applicable to the security maintenance of information systems with different security levels. 2 Normative Citations The clauses in the following documents become clauses of this specification through citation in this specification. For dated cited documents, all subsequent amendments (excluding revised content) or revisions do not apply to this specification, however, all parties who reach an agreement based on this specification are encouraged to study whether to use the latest version of these documents . For undated references, the latest edition applies to this specification. GB17859-1999 "Guidelines for Classification of Computer Information System Security Maintenance Levels" GB/TXXXA-XXX "Guidelines for Classification of Information System Security Maintenance Levels" .........)
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