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• OPC-10000-4 – OPC Unified Architecture - Part 4: Services
  7.40.2.3 EncryptedSecret Format
  KeyDataLength with the length of the encrypted KeyData; Append the Nonce and the Secret to the encrypted KeyData; Calculate padding required on the payload and append after the Secret; Encrypt ... KeyData is encrypted; Decrypt the payload; Verify the padding on the payload; Extract the Secret ; The fields in the EncryptedSecret are described in Table 183 . The first three fields TypeId
• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  6.8.3 ECC and RSA-DH Encrypted Secret
  Encrypted Secret OPC 10000-4 defines the layout of EccEncryptedSecret structure which is used to protect secrets with ECC and RSA-DH SecurityPolicies . Applying security with ... initialization vector are generated by using the EphemeralKey s to create the shared secret and then derive keys using the algorithm defined in 6.8.1 . Step 1 is slightly different