Authenticated Encryption Algorithms (AEAD) – OPC Unified Architecture

When not using encryption or when using AEAD algorithms, each MessageChunk has a footer with the fields defined in Table 62.

Table 62 – Message Footer for Sign Mode and AEAD Encryption

Name	Data Type	Description
Signature	OctetString	The signature for the MessageChunk. The signature includes the headers and all Message data. The signature is encoded as sequence of Bytes with a length specified by the SecurityPolicy.

Name

Data Type

Description

Signature

OctetString

The signature for the MessageChunk.

The signature includes the headers and all Message data.

The signature is encoded as sequence of Bytes with a length specified by the SecurityPolicy.