Flow Ctrl Tech Engineering

OPC UA Security Policies: Basic256Sha256, Aes128_Sha256_RsaOaep & Deprecated Ciphers

Selecting secure OPC UA endpoints: why None and Basic128Rsa15 must be disabled immediately, evaluating AES-256 vs AES-128 GCM, and protecting user credentials.

  • The "None" security policy transmits raw control values in cleartext; it should only ever be used for temporary bench testing.
  • Policies utilizing SHA-1 hashing (Basic128Rsa15, Basic256) are cryptographically broken and must be disabled in compliance audits.
  • Always select "SignAndEncrypt" with "Basic256Sha256" or "Aes256_Sha256_RsaPss" for production networks.

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