Security of smart grid communication protocols
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1 Security of smart grid communication protocols C-DAX is funded by the European Union's Seventh Framework Programme (FP7-ICT ) under grant agreement n Erik Poll Radboud University Nijmegen
2 Overview Before starting to secure communications End-to-end security limits of secure tunnels using eg. TLS Securing Information Centric Networking (ICN) in C-DAX Erik Poll - Security of smart grid communication protocols
3 Before starting to secure communications... Primary goal of ICT is to provide functionality Security is about controlling the risks that this functionality brings. This is always a secondary concern People will typically choose functionality over security... So, before starting to securing communications: Which functionality & data do you want to provide? When, where and to whom? Basis for deciding: a good risk assessment Erik Poll - Security of smart grid communication protocols 3
4 Example 1: smart metering in the Netherlands Original planned smart metering information architecture Detailed smart metering records held in central database Energy Supplier central database Independent Service Provider Erik Poll - Security of smart grid communication protocols 4
5 Example 1: smart metering in the Netherlands Revised architecture due to privacy concerns Detailed records kept in the meter itself, only fetched upon request Energy Supplier cache Independent Service Provider Erik Poll - Security of smart grid communication protocols 5
6 Example 2: smart metering in the Netherlands Smart meter can act as remote off switch restricting or stopping delivery Does this convenient functionality outweigh the security concerns it brings? After some discussion, smart meters in Netherlands now won t have this capability. Rare example of a choice for security over functionality! Erik Poll - Security of smart grid communication protocols 6
7 Example: Security as after-thought? Open Charge Point Protocol (OCPP) by Open Charge Alliance NB SHOULD not MUST This is the only mention of security, on the very last (200 th!) page + using a standard security solution such as TLS is a good idea securing this link might not provide end-to-end security we want Erik Poll - Security of smart grid communication protocols 7
8 Possible architecture for smart EV charging Erik Poll - Security of smart grid communication protocols 8
9 Possible architecture for smart EV charging Erik Poll - Security of smart grid communication protocols 9
10 Possible architecture for smart EV charging Erik Poll - Security of smart grid communication protocols 10
11 Limits of securing communication links Securing a communication link using standard solution like TLS is a great idea + we don t have to trust the underlying infrastructure except for availability + security is automatically enforced once data leaves the pipe, the security of the data is gone it provides end-to-end security for one link between two parties link-by-link security will not provide end-to-end security over multiple links we have to trust all intermediate parties Erik Poll - Security of smart grid communication protocols 11
12 Securing Information Centric Networking (ICN) One security benefit: clients need not know each other s IP address Secure TLS tunnels won t provide end-to-end security between publishers and subscribers publisher A topic 1 topic 2 subscriber S publisher B C-DAX cloud subscriber T Erik Poll - Security of smart grid communication protocols 12
13 Securing Information Centric Networking (ICN) One security benefit: clients need not know each other s IP address Secure TLS tunnels won t provide end-to-end security between publishers and subscribers publisher A topic 1 topic 2 subscriber S publisher B C-DAX cloud subscriber T Erik Poll - Security of smart grid communication protocols 13
14 Securing Information Centric Networking (ICN) We have to secure the data itself Conceptually: data in sealed closed envelope seal gives authenticity/integrity using digital signature or MAC closed evelope gives confidentiality using encryption publisher A topic 1 topic 2 subscriber S publisher B C-DAX cloud subscriber T Erik Poll - Security of smart grid communication protocols 14
15 Securing Information Centric Networking (ICN) NB no need to trust the C-DAX cloud at all publisher A Encryption & Signature/MAC topic 1 topic 2 C-DAX cloud Authentication subscriber S Decryption & Authentication Erik Poll - Security of smart grid communication protocols 15
16 Crypto scheme & key distribution Choice in cryptographic scheme & key distribution. Eg. Long lived public/private keypair per client for authentication (like normal PKI) Symmetric keys per topic different keys for authentication and encryption, so that cloud can authenticate but not eavesdrop Choice in which information to reveal on outside of envelope eg to allow filtering, though limited forms of filtering of encrypted data are possible We do need to include time stamps or sequence numbers to guarantee order & freshness which we get for free with TLS Erik Poll - Security of smart grid communication protocols 16
17 Securing Information Centric Networking (ICN) key distribution Security Server publisher A Encryption & Signature/MAC topic 1 topic 2 C-DAX cloud Authentication subscriber S Decryption & Authentication Erik Poll - Security of smart grid communication protocols 17
18 Securing Inter Domain Communications topic 2 less trusted subscriber X one-way copy via data diode topic 1 topic 2 C-DAX cloud Erik Poll - Security of smart grid communication protocols 18
19 Securing Inter Domain Communications cloud of TSO topic 2 less trusted subscriber X one-way copy via data diode topic 1 topic 2 cloud of DSO Erik Poll - Security of smart grid communication protocols 19
20 Conclusions Before you start securing communications, think about the data & functionality you want to expose Standard solutions like TLS are for securing connections but securing individual links might not provide the end-to-end security you want... Information-centric networking naturally provides end-to-end security C-DAX network overlay can provide end-to-end security independent of underlying communication networks After you secure communications, you still want to secure the end points... Erik Poll - Security of smart grid communication protocols 20
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