Presented by Philip Hawkes and Rick Wietfeldt, co-chairs of the MIPI Security Working Group MIPI Automotive SerDes Solutions (MASS) allows transmission of sensor and display data between sensors, electronic control units (ECUs) and displays distributed around a vehicle. The MIPI Security Working Group is developing a MASS security framework for protecting this data against malicious attacks. This session covers the objectives of the security framework and explains how the framework achieves those objectives.

1. © 2021 MIPI Alliance, Inc.
Phil Hawkes, Rick Wietfeldt
Qualcomm Inc.
Security Working Group Co-Chairs
MIPI Security for Automotive & IoT –
Initial Focus on MASS

2. © 2021 MIPI Alliance, Inc. 2
Overview
• MIPI Data Security Services
– Mitigate attacks on image data, control messages, IoT debug messages
• Flexible MIPI Security Framework
– System Security Mgmt (SSM) Suite establishes Data Security Services
• Security for MIPI Automotive SerDes Solutions (MASS)
– Overlays MIPI Security Framework on the 1-5 Automotive Model
– SSM Suite: leverages DMTF security protocols
– Data Security Services for MIPI CSI-2SM, MIPI DSI-2SM, VESA eDP/DP,
MIPI CCISM and MIPI A-PHYSM control
• Status
DMTF: Distributed
Management Task Force

3. © 2021 MIPI Alliance, Inc. 3
MIPI Automotive SerDes Solution (MASS) in the car
Electronic Control Unit (ECU)
– Advanced driver assistance
system (ADAS) based on
sensor feeds
– Produces display feeds
Sensors
– Camera
– Radar, Lidar
Displays
– Dashboard
– Console
– Side view mirrors
– Entertainment
(Opt) A-PHY Bridges
– Translates between
short-range MIPI C-PHYSM/ D-PHYSM
& long-range MIPI A-PHYSM
Dashboard
Rear sensors
Front sensors
Console
ECU
MIPI Interconnects via Automotive PHY (A-PHY)
A-PHY Bridge

4. © 2021 MIPI Alliance, Inc. 4
Security Concepts 101
• Authentication establishes trust
– Securely identifying a component
– Mutual authentication – two components authenticate each other
• Once trust is established, then address
– Integrity
• Being sure that information came from the expected source and is
unaltered
• Provided by Message Authentication Code (MAC)
– Confidentiality
• Protecting information against unauthorized access
• Provided by encrypting messages

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What are the Data Security Services protecting?
• Image Data Security Considerations
– Integrity of Sensor images Manipulating ADAS
– Confidentiality of Sensor images Privacy: location-revealing images
– Integrity of Display images Incorrect dashboard display
• Control Data
– Integrity of Sensors Capabilities/config Disable/manipulate sensor
– Integrity of Display Capabilities/config Disable/manipulate display
– Integrity of A-PHY Capabilities/config Disrupt A-PHY network
– Confidentiality of all config Proprietary/sensitive/privacy
• IoT Debug Data
– Integrity of read/write config Disable/manipulate component
– Confidentiality of proprietary data Proprietary/sensitive/privacy
– Not discussed further in this presentation. Will leverage some of MIPI security framework

6. © 2021 MIPI Alliance, Inc. 6
MASS 1-5 Model & MIPI Protocols
Controller ~ SoC ; Target is either Camera sensor or Display
(Opt)
(Opt)
#1
Controller
(SoC)
#5
Target
(Peripheral)
(SNS or
Display
TCON/
DDIC)
(C/D/DP-
PHY)
A-PHY A-PHY
(C/D/DP-
PHY)
Display Display
Camera Camera
(Application)
Control Plane Messages
(in-band or sideband)
Sideband
PHY
Sideband
PHY (Opt)
#2
C.Bridge
(Opt)
#3
A-PHY
Forwarding
Element
(Opt)
#4
T.Bridge
(Opt)
(Application)
Data Plane Messages
(in-band)
in-band
sideband
A-PHY Network
A-PHY Control Plane
Messages
(sideband)
(Opt)
(Opt)
(Opt)
(Opt)

7. © 2021 MIPI Alliance, Inc. 7
(Opt)
(Opt)
#1
Controller
(SoC)
#5
Target
(Peripheral)
(SNS or
Display
TCON/
DDIC)
(C/D/DP-
PHY)
A-PHY A-PHY
(C/D/DP-
PHY)
Display Display
Camera Camera
(Application)
Control Plane Messages
(in-band or sideband)
Sideband
PHY
Sideband
PHY (Opt)
#2
C.Bridge
(Opt)
#3
A-PHY
Forwarding
Element
(Opt)
#4
T.Bridge
(Opt)
(Application)
Data Plane Messages
(in-band)
in-band
sideband
A-PHY Network
A-PHY Control Plane
Messages
(sideband)
(Opt)
(Opt)
(Opt)
(Opt)
Data Security Services
In-band security and side-band security
In-band security
(CSI-2, DSI-2, DP/eDP)
Side-band security
(CCI, A-PHY Control)

8. © 2021 MIPI Alliance, Inc. 8
MIPI Security Flow
Applies to all Data Security Services (DSS)
2.
Read
Capabilities
Read/Identify
DSS supported
security
algorithms per
component
3.
Build multiple DSS
configurations
Combo of DSS security
algorithms, keys.
Built based on
supported DSS security
algorithms and desired
DSS operation
5.
Build Real-time
Operating Control
Per-message DSS controls,
selecting
• A DSS config
• payload encryption on/off
• payload integrity on/off)
System Security Management (SSM) Suite
Component Configuration over secure connection
established by Controller
Out of scope
Implementation details depending
on policy of Integrator.
Data Security
Service (DSS)
6.
Communicate &
execute per-
message DSS
controls
1.
Authenticate &
establish secure
session
For protecting
Steps 1 & 2.
4.
Provision
multiple DSS
configurations
SSM Suite Establishes Data Security Services

9. © 2021 MIPI Alliance, Inc. 9
System Security Management (SSM) Suite.
SSMC = SSM Controller (in #1)
SSMT = SSM Target (in #2/3/4/5)
1. Authenticate & establish secure session
DMTF protocols (DSP0274, DSP0277)
2. Read support security algorithms
3. (Out of scope) Build DSS config
4. Write DSS config
5. (Out of scope) Build real time operating control
6. Apply Data Security Services
0. (Out of scope) Integrator provisions
authentication credentials
This can be applied directly from
Controller #1 to Target #5 over any MIPI
PHY – does not require presence of A-PHY
MIPI Security Framework
#1
Controller
#5
Target
(C/D/DP-
PHY)
A-PHY A-PHY
(C/D/DP-
PHY)
Sideband
PHY
Sideband
PHY (Opt)
#2
C.Bridge
#3
A-PHY
Forwarding
Element
#4
T.Bridge
SSMC
Camera Control Interface (CCI) Security
SSMT
SSMT
SSMT
SSM Suite
SSMT

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System Security Management (SSM) Suite
Set of protocols between Controller #1 and other
Components (#2-#5)
• DMTF’s SPDM (DSP0274) performs symmetric or
asymmetric mutual authentication to establish
secure session
• DMTF’s Secured Messages (DSP0277)
protects MIPI SACP
– Encryption and integrity protection
• MIPI’s Service Association Configuration Protocol
(SACP)
– Read Security Capability Registers for Data
Security Services
– Write Security SA Registers for Data Security Services
MIPI’s SSM Suite is defined in MIPI Security
Specification
SPDM: Security Protocol
and Data Model
DMTF: Distributed
Management Task Force
#1
Controller
#5
Target
(C/D/DP-
PHY)
A-PHY A-PHY
(C/D/DP-
PHY)
Sideband
PHY
Sideband
PHY (Opt)
#2
C.Bridge
#3
A-PHY
Forwarding
Element
#4
T.Bridge
SSMC
Camera Control Interface (CCI) Security
SSMT
SSMT
SSMT
SSM Suite
SSMT

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Data Security Services
• SEP Security
– MIPI CSI-2SM, MIPI DSI-2SM, VESA eDP/DP
– To be defined in Camera/Display Service Extensions
(MIPI CSESM/MIPI DSESM) specifications
• ESS CCI2 Security for CCI (Camera Control Interface)
– I2C-based register access
– To be defined in MIPI CSESM specification
• ACMP2 Security for MIPI A-PHYSM Control
– I2C-based register access
– Reuse ESS CCI2 protocol
– To be defined in MIPI A-PHYSM specification
Integrity protection via Message Authentication Code
(MAC) adds communication and computation overhead
– Sending MAC Per-frame vs per-message reduces
communication overhead
– Protecting a fraction of image payloads reduces
computation overhead with security trade-off
SEP: Service
Extension Packet
ESS CCI2: Extended
Safety & Security CCI
ACMP2: A-PHY Configuration
& Management Protocol
#1
Controller
#5
Target
(C/D/DP-
PHY)
A-PHY A-PHY
(C/D/DP-
PHY)
Sideband
PHY
Sideband
PHY (Opt)
#2
C.Bridge
#3
A-PHY
Forwarding
Element
#4
T.Bridge
SSMC
Camera Control Interface (CCI) Security
SSMT
SSMT
SSMT
SSM Suite
SSMT

12. © 2021 MIPI Alliance, Inc. 12
Conclusion
• MIPI Security Framework
– Supports various topologies, with and without A-PHY integration
– System Security Management (SSM) Suite managing Data Security Services
• System Security Management (SSM) Suite
– Provides mutual authentication & configuration of Data Security Services
– Defined in MIPI Security Specification
• Data Security Services (DSS)
– Protects image data (MIPI CSI-2SM, MIPI DSI-2SM, VESA eDP/DP) and control data
– Provides end-to-end security
– Defined in MIPI CSESM, MIPI DSESM, MIPI A-PHYSM Specifications
• Set of security specifications expected mid 2022

13. © 2021 MIPI Alliance, Inc.