IEEE MEDIA INDEPENDENT HANDOVER DCN: REVP-Proposal-on-the-security-of Title: Proposal on the security of Date Submitted: May 13, 2015 Presented at IEEE session #68 in Vancouver, Canada Authors or Source(s): Yuji Unagami, Yusuke Shimizu(Panasonic) Abstract: This document proposed a security of the We have been studying to use standard as the security technology with HEMS. We propose two items for flexible implementation REVP-Proposal-on-the-security-of

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Background of this proposal Japanese Government(METI: Ministry of Economy, Trade and Industry) is leading the initiative to achieve HEMS(Home Energy Management System) systems. Note: Currently Each manufacture is using their own proprietary technology. Panasonic is one of the board member of this initiative to utilize ECHONET-Lite protocol for seamless communication between various home appliance product. Panasonic has been studying to use standard as the security technology with ECHONET-Lite. Home gateway device Currently Home gateway Future Proprietary non- interoperability non- interoperability Interoperability with standardized Interoperability with standardized Home gateway device REVP-Proposal-on-the-security-of

Background of this proposal We are studying to use d protocol for HEMS in Japan market. PoS with Group Manager : home gateway PoS : device(e.g. air conditioner, sensor, etc..) Flexible implementation is very important for the use of d. Processing of signature for each multicast transmission is too burden for air conditioner. PoS with Group Manager PoS MN Multicast Transport REVP-Proposal-on-the-security-of

ID_TYPE of SAID TLV Add new parameter in “ID_TYPE” field for the use of other key management technology. e.g. ECDH, Key distribution from the PoS with Group Manager, etc. TYPELENGTHSEQUENCE (ID_TYPE, ID_VALUE) SAID TLV ID_TYPE 0: TLS-generated 1: EAP-generated 2: GKB-generated 3: Other-generated REVP-Proposal-on-the-security-of

MIC of AES_CCM It is stated in the specification of d. (8.4.2) A Signature TLV should be used for multicast MIH messages in order to provide source origin authentication for multicast MIH massages. Otherwise, a message alternation(alteration?) attack by an insider who has a GKB SA is possible even if the multicast MIH message is integrity protected by the group key corresponding to the GKB SA. Signature verification process is too much burden for the low- power computing device, however, there should be some scheme to prevent tampering by a third party. MIH header (S=1) Source MIHF Identifier TLV Destination MIHF Identifier TLV SAID TLVService Specific TLV AES_CCM MIH header (S=1) Source MIHF Identifier TLV Destination MIHF Identifier TLV SAID TLV ENC_DATAMIC_DATA Security TLV a message alteration attack by a third party who does not have a GKB SA is possible REVP-Proposal-on-the-security-of

MIC of AES_CCM Generate MIC_DATA not only by Service Specific TLV but also MIH frame. MIH header (S=1) Source MIHF Identifier TLV Destination MIHF Identifier TLV SAID TLVService Specific TLV AES_CCM(MIC) AES_CCM(Enc) MIH header (S=1) Source MIHF Identifier TLV Destination MIHF Identifier TLV SAID TLV Security TLV ENC_DATAMIC_DATA Third party who does not have GKB SA can not execute alteration attack REVP-Proposal-on-the-security-of

Supplement REVP-Proposal-on-the-security-of

Background details Japanese Government is leading the initiative to achieve HEMS systems REVP-Proposal-on-the-security-of The scope of standardization in HEMS-TF I/F home appliance Stationary battery PV Reference Device List Smart meter PV(Photovoltaics) Stationary battery Fuel cell EVPS(EV Power Station) Air conditioner Lighting Hot water dispenser

Background details The Japanese government has recommended ECHONET Lite as standard interface REVP-Proposal-on-the-security-of home appliance housing equipment energy equipment Service Network Command Protocol ECHONET Lite standard Network of lower layer(PHY, MAC) Discussed in HEMS-TF Communication address using IP address IP address Reference

Background details HEMS-TF were selected standard media REVP-Proposal-on-the-security-of Reference Layer 5-7 Layer 4 Layer 3 Layer 2 Layer 1 Network layer Network of lower layer 920MHz 2.4GHzPLC Service 5GHz Ether net

Background details d is implemented between UDP and ECHONET Lite REVP-Proposal-on-the-security-of Reference Layer 5-7 Layer 4 Layer 3 Layer 2 Layer 1 920MHz 2.4GHzPLC5GHz Ether net d Including state machine, fragment. Including state machine, fragment.