23 Security functions Page 109 of 142
MCS301 meter - product Manual 1.25 MetCom Solutions GmbH
Data transport security – message (ADPU) protection
Definitions for a security context with a security policy, security suite and the security material
elements.
• Cryptographic protection to messages – xDLMS APDUs – during transport
• authentication to ensure authenticity (legitimate source) and integrity of messages
• encryption to ensure confidentiality
• authenticated encryption to provide both
• digital signature: authentication and non-repudiation
these can be applied in any combination, separately on requests and responses
• Protection determined by
• security policy: sets general message protection requirements
• access rights: sets local, COSEM object attribute / method level
• protection requirements
• the stronger requirement applies
• protection can be applied independently on requests and responses
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