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Management of Critical Settings (MCS)

This software allows safe adjustment of interlock thresholds in critical machinery settings through digital signatures, ensuring data integrity and security during operation.

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Management of Critical Settings (MCS)

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  1. Management of Critical Settings (MCS) Management of Critical Settings (MCS) User Info… 19Dec06

  2. Introduction... TrimEditor RBA Role based access: authentication + authorisation If authorised: the new value is stored in the DB plus MCS digital signature. If cycle resident: the new value is sent to the HW plusMCS digital signature. LSA DB CMW FESA FESA verifies the MCS digital signature. If successful, new interlock threshold stored in HW. • Software to manage interlock thresholds which might need adjusting during operation in a safe way… In order to change a critical setting (interlock threshold)… Digital signature is generated from data set with a secret private key, guarantees integrity of data. 19Dec06

  3. Scope (1) • The MCS should only handle key machine protection related interlock settings and parameters • restricted to only these machine elements • Interlock settings can be • single values • functions of time, energy, b* • tables (LHC BLM thresholds,…) 19Dec06

  4. Scope (2) • The MCS will/could also be used to manage • reference values for beam dump XPOC • reference values for the Software Interlocking System • operating conditions during commissioning 19Dec06

  5. MCS & digital signatures…Info • Simplified picture: • MCS signs data with a private key and front-ends only accept data with the correct signature, verified with the public key. • MCS Method • after the initialisation or modification of critical settings • new signature is generated from data with private key AND stored with the data in the database • the data is sent to hardware from the database • FESA has the public key and verifies the signature • in case of correct signature data is transferred to front-end expert code otherwise rejected • front-end expert codes will stay untouched 19Dec06

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