DNP3 Secure Authentication Version 5 addresses security vulnerabilities and other issues found in previous versions, and is not backwards-compatible.Version 5 is the only recommended version that provides optional methods to remotely change User Update Keys using either symmetric or asymmetric (public key) cryptography.
Versions 1, 3, & 4 are withdrawn. Version 2, which was included in IEEE 1815-2010, is deprecated and should not be deployed in new implementations. Version 2 is not compatible with Version 5, which will be included in IEEE 1815-2012.
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