diff --git a/docs/_static/css/custom.css b/docs/_static/css/custom.css
index 93747c8..9377480 100644
--- a/docs/_static/css/custom.css
+++ b/docs/_static/css/custom.css
@@ -1,5 +1,5 @@
 /*-----------------------------------------------------------------------------
-# Copyright (c) 2020, Arm Limited and Contributors. All rights reserved.
+# Copyright (c) 2020-2022, Arm Limited and Contributors. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
@@ -83,3 +83,19 @@
    font-size: 6rem;
    color: #343131;
 }
+
+/* override table width restrictions */
+.wy-table-responsive table td, .wy-table-responsive table th {
+    white-space: normal;
+}
+
+.wy-table-responsive {
+    margin-bottom: 24px;
+    max-width: 100;
+    overflow: visible;
+}
+
+wy-table-bordered-all, .rst-content table.docutils {
+    max-width: 100%;
+    min-width: 100%;
+}
\ No newline at end of file
diff --git a/docs/security/generic-data-flow.graphml b/docs/security/generic-data-flow.graphml
new file mode 100644
index 0000000..5d96f00
--- /dev/null
+++ b/docs/security/generic-data-flow.graphml
@@ -0,0 +1,500 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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+  <key attr.name="url" attr.type="string" for="node" id="d4"/>
+  <key attr.name="description" attr.type="string" for="node" id="d5"/>
+  <key for="node" id="d6" yfiles.type="nodegraphics"/>
+  <key for="graphml" id="d7" yfiles.type="resources"/>
+  <key attr.name="url" attr.type="string" for="edge" id="d8"/>
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+  <key for="edge" id="d10" yfiles.type="edgegraphics"/>
+  <graph edgedefault="directed" id="G">
+    <data key="d0" xml:space="preserve"><![CDATA[Copyright (c) 2022, Arm Limited and Contributors. All rights reserved.
+SPDX-License-Identifier: BSD-3-Clause
+
+Generic threat modell of a Trusted Service.
+]]></data>
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+HW<y:LabelModel><y:SmartNodeLabelModel distance="4.0"/></y:LabelModel><y:ModelParameter><y:SmartNodeLabelModelParameter labelRatioX="0.0" labelRatioY="0.0" nodeRatioX="0.0" nodeRatioY="0.0" offsetX="0.0" offsetY="0.0" upX="0.0" upY="-1.0"/></y:ModelParameter></y:NodeLabel>
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+          <y:Fill color="#DDD55F" transparent="false"/>
+          <y:BorderStyle color="#000000" raised="false" type="line" width="1.0"/>
+          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="48.103515625" horizontalTextPosition="center" iconTextGap="4" modelName="custom" textColor="#000000" verticalTextPosition="bottom" visible="true" width="131.39453125" x="13.03757812500021" xml:space="preserve" y="11.563280078128969">Dedicated,
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+HW<y:LabelModel><y:SmartNodeLabelModel distance="4.0"/></y:LabelModel><y:ModelParameter><y:SmartNodeLabelModelParameter labelRatioX="0.0" labelRatioY="0.0" nodeRatioX="0.0" nodeRatioY="0.0" offsetX="0.0" offsetY="0.0" upX="0.0" upY="-1.0"/></y:ModelParameter></y:NodeLabel>
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+        <y:ShapeNode>
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+Physically protected
+HW<y:LabelModel><y:SmartNodeLabelModel distance="4.0"/></y:LabelModel><y:ModelParameter><y:SmartNodeLabelModelParameter labelRatioX="0.0" labelRatioY="0.0" nodeRatioX="0.0" nodeRatioY="0.0" offsetX="0.0" offsetY="0.0" upX="0.0" upY="-1.0"/></y:ModelParameter></y:NodeLabel>
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+        <y:ShapeNode>
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+          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="48.103515625" horizontalTextPosition="center" iconTextGap="4" modelName="custom" textColor="#000000" verticalTextPosition="bottom" visible="true" width="131.39453125" x="13.03757812500021" xml:space="preserve" y="11.563280078128969">Non dedicated,
+Not physically protected
+HW<y:LabelModel><y:SmartNodeLabelModel distance="4.0"/></y:LabelModel><y:ModelParameter><y:SmartNodeLabelModelParameter labelRatioX="0.0" labelRatioY="0.0" nodeRatioX="0.0" nodeRatioY="0.0" offsetX="0.0" offsetY="0.0" upX="0.0" upY="-1.0"/></y:ModelParameter></y:NodeLabel>
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diff --git a/docs/security/index.rst b/docs/security/index.rst
index ac271be..513c3fd 100644
--- a/docs/security/index.rst
+++ b/docs/security/index.rst
@@ -6,14 +6,15 @@
     :caption: Contents:
 
     self
+    threat-model
 
-TODO:
-SDL
-Threat Modell
-etc..
+The security model of Trusted Services build on the `Platform Security Model`_ v1.1 beta. For a concept level overview
+please refer to this document.
 
 --------------
 
-*Copyright (c) 2020-2021, Arm Limited and Contributors. All rights reserved.*
+.. _`Platform Security Model`: https://developer.arm.com/documentation/den0128/1-1/?lang=en
+
+*Copyright (c) 2020-2022, Arm Limited and Contributors. All rights reserved.*
 
 SPDX-License-Identifier: BSD-3-Clause
diff --git a/docs/security/threat-model.rst b/docs/security/threat-model.rst
new file mode 100644
index 0000000..3bd9dd0
--- /dev/null
+++ b/docs/security/threat-model.rst
@@ -0,0 +1,439 @@
+Generic Threat Model
+====================
+
+Threat modeling is a process to identify security requirements, pinpoint security threats and potential vulnerabilities,
+quantify threat and vulnerability criticality and prioritize remediation methods.
+
+In the next sections you can find the output of this process the for a generic, use-case and service independent
+assessment.
+
+Target evaluation
+-----------------
+
+In this threat model, the target of evaluation is the S-EL0 SPs part of the PSA RoT hosting a "generalized" trusted
+service.
+
+This evaluation is based on the following assumptions:
+
+    * The implementation is based on the |FF-A| standard.
+    * Trusted boot is enabled. This means an attacker can’t boot arbitrary images that are not approved by platform
+      providers.
+    * Each trusted service is running in an S-EL0 secure partition. Access to memory and hardware is controlled by the
+      SPM based on the FF-A manifest or FF-A framework messages.
+    * Components running at higher privilege levels than S-EL0 are to be inherently trusted. (I.e. the SPM).
+
+Data flow diagram
+-----------------
+
+The data flow diagram visualizes the connection between components and where the data flow crosses security boundaries.
+
+.. image:: ./generic-data-flow.svg
+   :target: Attachments_
+
+.. table:: List of data flows
+
+    +-----------+---------------------------------------------------------------------------------+----------+
+    | Data flow | Description                                                                     | In scope |
+    +-----------+---------------------------------------------------------------------------------+----------+
+    | DF1       | Trusted Service interacts with NWd client directly.                             | Yes      |
+    +-----------+---------------------------------------------------------------------------------+----------+
+    | DF2       | Trusted Service interacts with NWd client through SPM.                          | Yes      |
+    +-----------+---------------------------------------------------------------------------------+----------+
+    | DF3       | Trusted Services interact through SPM.                                          | Yes      |
+    +-----------+---------------------------------------------------------------------------------+----------+
+    | DF4       | Trusted Service logs debug information.                                         | Yes      |
+    +-----------+---------------------------------------------------------------------------------+----------+
+    | DF5       | Trusted Services interact directly.                                             | Yes      |
+    +-----------+---------------------------------------------------------------------------------+----------+
+    | DF6, DF7  | Trusted Services interacts with shared hardware.                                | Yes      |
+    +-----------+---------------------------------------------------------------------------------+----------+
+    | DF8       | Trusted Service interacts with dedicated peripheral interface.                  | Yes      |
+    +-----------+---------------------------------------------------------------------------------+----------+
+    | DF9, DF10 | Trusted Service interacts with shared, external hardware.                       | Yes      |
+    +-----------+---------------------------------------------------------------------------------+----------+
+    | DF11      | Trusted Service interacts with dedicated, external hardware.                    | Yes      |
+    +-----------+---------------------------------------------------------------------------------+----------+
+    | DF12      | NWd interacts with more privileged software.                                    | No       |
+    +-----------+---------------------------------------------------------------------------------+----------+
+    | DF13      | FF-A manifest and other data is handed over to a Trussed Service                | No       |
+    +-----------+---------------------------------------------------------------------------------+----------+
+
+Trust boundaries
+----------------
+
+.. list-table:: List of trust boundaries
+
+    * - Trust boundary
+      - Description
+    * - TB1
+      - Trust boundary between TEE and normal world.
+    * - TB2
+      - Trust boundary between higher privilege level SW and Trusted Services.
+    * - TB3, TB4
+      - Trust boundary between trusted services.
+    * - TB5
+      - Trust boundary to physically accessible external hardware.
+
+Assets
+------
+
+The above dataflow identifies the following generalized assets.
+
+.. table::
+
+    +----------------------+----------------------------------------------------------------------------------+
+    | Asset                | Description                                                                      |
+    +----------------------+----------------------------------------------------------------------------------+
+    | ``availability``     | Availability of a trusted service to clients.                                    |
+    +----------------------+----------------------------------------------------------------------------------+
+    | ``code execution``   | Code or code flow of a trusted service.                                          |
+    +----------------------+----------------------------------------------------------------------------------+
+    | ``sensitive data``   | Data that an attacker must not tamper with. These include device identity key,   |
+    |                      | Initial Attestation Key, Protected Storage Key, UEFI variables, tpm-event log,   |
+    |                      | etc...                                                                           |
+    +----------------------+----------------------------------------------------------------------------------+
+    |``sensitive hardware``| Hardware that an attacker must not be tamper with. Examples are control interface|
+    |                      | of storage medium, true random number generator, crypto accelerator.             |
+    +----------------------+----------------------------------------------------------------------------------+
+
+Attackers and threat agents
+---------------------------
+
+This section identifies the generalized stakeholders interacting with secure services.
+
+.. list-table::
+    :widths: 20,70,10
+
+    * - Attacker/Threat agent
+      - Description
+      - In scope
+    * - ``NSClient``
+      - Client executing in the normal world.
+      - Yes
+    * - ``SClient``
+      - Client running in SWd.
+      - Yes
+    * - ``HPComponent``
+      - Components running at higher privilege level than the trusted service.
+      - No
+    * - ``AppDebug``
+      - Physical attacker using debug signals to access resources.
+      - Yes
+    * - ``PhysAcc``
+      - Physical attacker having access to the external device communication bus and to the external flash communication
+        bus using common hardware.
+      - Yes
+    * - ``AdvPhysAcc``
+      - Attackers who are able to use specialist hardware for attacks that require irreversible changes to the target
+        system (e.g., "rewiring" a chip using a Focused IonBeam FIB workstation).
+      - No
+
+
+
+Threat Priority
+---------------
+
+Threat priority calculation is based on `Common Vulnerability Scoring System`_ (CVSS) Version 3.1. The threat priority
+is represented by the `Severity Rating Scale`_ calculated from the CVSS score of each threat. The CVSS score is
+calculated using the `Vulnerability Calculator`_.
+
+For each threat the priority and a link to CVSS calculator capturing the calculator settings will be listed.
+
+Threat Types
+------------
+
+In this threat model we categorize threats using the `STRIDE threat analysis technique`_. In this technique a threat is
+categorized as one or more of these types: ``Spoofing``, ``Tampering``, ``Repudiation``, ``Information disclosure``,
+``Denial of service`` or ``Elevation of privilege``.
+
+.. list-table::
+    :widths: 15,80
+
+    * - **ID**
+      - 1
+    * - Description
+      - Information leak via debug logs.
+
+        During development it is common practice to help understanding code execution by emitting
+        debug logs.
+    * - Data flow
+      - DF4
+    * - Asset(s)
+      - ``Sensitive Data``
+    * - Threat Agent/Attacker
+      - ``AppDebug``
+    * - Threat type
+      - ``Information disclosure``
+    * - Impact
+      - Sensitive information may get to unauthorized people. Information can potentially help
+        compromising the target or other systems.
+    * - Scoring/CVSS
+      - Medium, 4.6 `CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N <https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N>`_
+    * - Mitigation
+      - Log messages are put to "verbosity categories". Release builds limit printed log messages
+        to "error" category.
+    * - Mitigation in place
+      - yes
+
+.. list-table::
+    :widths: 15,80
+
+    * - **ID**
+      - 2
+    * - Description
+      - An attacker can tamper with sensitive data and execute arbitrary code through hardware-assisted
+        debug interface.
+    * - Data flow
+      - N/A.
+    * - Asset(s)
+      - ``Sensitive Data``, ``Code Execution``, ``Sensitive Hardware``
+    * - Threat Agent/Attacker
+      - ``AppDebug``
+    * - Threat type
+      - ``Information disclosure``, ``Tampering``
+    * - Impact
+      - Sensitive information may get to unauthorized people. Information can potentially help
+        compromising the target or other systems.
+
+        An attacker may modify sensitive data and alter device behavior and thus compromise the
+        target or other systems.
+    * - Scoring/CVSS
+      - Medium, 6.8 `CVSS:3.1/AV:P/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H <https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:P/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H>`_
+    * - Mitigation
+      - Hardware platform specific means to disable or limit access to debug functionality.
+    * - Mitigation in place
+      - yes
+
+.. list-table::
+    :widths: 15,80
+
+    * - **ID**
+      - 3
+    * - Description
+      - An attacker can perform a denial-of-service attack by using a broken service call that
+        causes the service to enter an unknown state.
+
+        Secure and non-secure clients access a trusted service through FF-A calls. Malicious code
+        can attempt to place the service into an inconsistent state by calling unimplemented
+        calls or by passing invalid arguments.
+    * - Data flow
+      - DF1, DF2, DF3, DF5
+    * - Asset(s)
+      - ``Availability``
+    * - Threat Agent/Attacker
+      - ``NSclient``, ``SClient``
+    * - Threat type
+      - ``Denial of service``
+    * - Impact
+      - The service or the whole system may temporarily or permanently enter an unusable state.
+    * - Scoring/CVSS
+      - Medium, 6.8 `CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H <https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H>`_
+    * - Mitigation
+      - The service must validate all inputs before usage. Input validation shall be checked during
+        code review and by testing.
+    * - Mitigation in place
+      - yes
+
+.. list-table::
+    :widths: 15,80
+
+    * - **ID**
+      - 4
+    * - Description
+      - Memory corruption due to memory overflows and lack of boundary checking when accessing
+        resources.
+
+        Allows an attacker to execute arbitrary code, modify memory content to change
+        program flow.
+    * - Data flow
+      - DF1, DF2, DF3, DF5
+    * - Asset(s)
+      - ``Code execution``, ``Sensitive Data``, ``Denial of service``
+    * - Threat Agent/Attacker
+      - ``SClient``, ``NSClient``, ``HSComponent``
+    * - Threat type
+      - ``Tampering``, ``Information disclosure``, ``Elevation of privilege``, ``Denial of service``
+    * - Impact
+      - The service or the whole system may temporarily or permanently enter an unusable state.
+
+        Malicious code might be executed in the context of the compromised service.
+        Leakage of sensitive data.
+    * - Scoring/CVSS
+      - High, 8.4 `CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H <https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H>`_
+    * - Mitigation
+      - The service must validate boundaries and sanity check incoming data. Validation shall be
+        checked during code reviews and by testing.
+    * - Mitigation in place
+      - yes
+
+.. list-table::
+    :widths: 15,80
+
+    * - **ID**
+      - 5
+    * - Description
+      - External devices connected to the system storing sensitive data. An attacker could eavesdrop external signals.
+    * - Data flow
+      - DF9, DF10, DF11
+    * - Asset(s)
+      - ``Sensitive Data``
+    * - Threat agent/Attacker
+      - ``PhysAcc``
+    * - Threat type
+      - ``Information disclosure``
+    * - Impact
+      - An attacker may get access to sensitive data, could tamper with sensitive data, or could attack the service
+        using the external device by injecting malicious data, which could lead to malfunction or execution of malicious
+        code.
+    * - Scoring/CVSS
+      - Medium, 5.9 `CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H <https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H>`_
+    * - Mitigation
+      - When designing the use case, storage services must be assessed to understand which protection type they can
+        implement (integrity, authenticity, confidentiality, rollback-protection). Sensitive data must be categorized
+        and mapped to the storage service which can provide the needed protection.
+
+        For example integrity can be safeguarded by using checksums. Authenticity by using digital signatures.
+        Confidentiality by using encryption. Rollback protection by using nonce values.
+    * - Mitigation in place
+      - yes
+
+.. list-table::
+    :widths: 15,80
+
+    * - **ID**
+      - 6
+    * - Description
+      - State of external devices connected to the system might be modified by an attacker.
+
+        This includes modifying signals, replacing the device, or modifying device content.
+    * - Data flow
+      - DF9, DF10, DF11
+    * - Asset(s)
+      - ``Sensitive Data``, ``Denial of service``, ``Code execution``
+    * - Threat agent/Attacker
+      - ``PhysAcc``
+    * - Threat type
+      - ``Tampering``, ``Denial of service``, ``Code execution``
+    * - Impact
+      - An attacker could tamper with sensitive data, or could attack the system by injecting malicious data, which
+        could lead to malfunction, execution of malicious code, or using old state with known vulnerability.
+    * - Scoring/CVSS
+      - High, 7.3 `CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H <https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H>`_
+    * - Mitigation
+      - When designing the use case, storage services must be assessed to understand which protection type they can
+        implement (integrity, authenticity, confidentiality, rollback-protection). Sensitive data must be categorized
+        and mapped to the storage service which can provide the needed protection.
+
+        For example integrity can be safeguarded by using checksums. Authenticity by using digital signatures.
+        Confidentiality by using encryption. Rollback protection by using hardware backed nonce values.
+    * - Mitigation in place
+      - yes
+
+
+.. list-table::
+    :widths: 15,80
+
+    * - ID
+      - 7
+    * - Description
+      - Invalid or conflicting access to shared hardware.
+
+    * - Data flow
+      - DF6, DF7, DF9, DF10
+    * - Asset(s)
+      - ``Sensitive Data``, ``Denial of service``, ``Code execution``
+    * - Threat Agent/Attacker
+      - ``SClient``, ``NSClient``, ``HPComponent``
+    * - Threat type
+      - ``Tampering``, ``Information disclosure``, ``Denial of service``, ``Code execution``
+    * - Impact
+      - A trusted service relying on shared hardware usage might get compromised or misbehaving if other stakeholders
+        affect shared hardware in unexpected way.
+
+    * - Scoring/CVSS
+      - High, 7.0 `CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:H <https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:H>`_
+    * - Mitigation
+      - Access to peripherals must be limited to the smallest possible set of services. Ideally each peripheral should be
+        dedicated to a single trusted service and sharing of peripherals should be avoided is possible. If sharing can
+        not be avoided, a strict handover process shall be implemented to allow proper context switches, where hardware
+        state can be controlled.
+    * - Mitigation in place
+      - yes
+
+.. list-table::
+    :widths: 15,80
+
+    * - **ID**
+      - 8
+    * - Description
+      - Unauthenticated access to hardware.
+
+        A trusted service relying on hardware usage might get compromised or misbehaving if hardware state is
+        maliciously altered.
+    * - Data flow
+      - DF6, DF7, DF9, DF10
+    * - Asset(s)
+      - ``Sensitive Data``, ``Denial of service``, ``Code execution``
+    * - Threat Agent/Attacker
+      - ``SClient``, ``NSClient``, ``HPComponent``
+    * - Threat type
+      - ``Tampering``, ``Information disclosure``, ``Denial of service``, ``Code execution``
+    * - Impact
+      - An attacker may get access to sensitive data of might make a trusted service or the system enter an unusable
+        state by tampering with hardware peripherals.
+    * - Scoring/CVSS
+      - Medium, 6.4 `CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H <https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H>`_
+    * - Mitigation
+      - Access to peripherals must be limited to the smallest possible set of services. Ideally each peripheral should be
+        dedicated to a single trusted service, and sharing of peripherals should be avoided is possible. If sharing can
+        not be avoided, a strict handover process shall be implemented to allow proper context switches, where register
+        values can be controlled.
+    * - Mitigation in place
+      - yes
+
+
+.. list-table::
+    :widths: 15,80
+
+    * - **ID**
+      - 9
+    * - Description
+      - Unauthenticated access to sensitive data.
+    * - Data flow
+      - DF1, DF2, DF3, DF5
+    * - Asset(s)
+      - ``Sensitive Data``, ``Denial of service``
+    * - Threat Agent/Attacker
+      - ``SClient``, ``NSClient``, ``HPComponent``
+    * - Threat type
+      - ``Tampering``, ``Information disclosure``, ``Denial of service``
+    * - Impact
+      - A trusted service may manage data of multiple clients. Different clients shall not be able to access each
+        other's data unless in response to explicit request.
+    * - Scoring/CVSS
+      - Medium, 6.8 `CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N <https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N>`_
+    * - Mitigation
+      - Trusted services must implement access control based on identification data provided by higher privileged
+        components (i.e. FF-A endpoint ID).
+    * - Mitigation in place
+      - yes
+
+
+--------------
+
+.. _Attachments:
+.. Rubric:: Attachments
+
+Source file of the `Data flow diagram`_. Please use the yEd_ for editing. :download:`./generic-data-flow.graphml`
+
+--------------
+
+.. _`Common Vulnerability Scoring System`: https://www.first.org/cvss/v3.1/specification-document
+.. _`Vulnerability Calculator`: https://www.first.org/cvss/calculator/3.1
+.. _`Severity Rating Scale`: https://www.first.org/cvss/v3.1/specification-document#Qualitative-Severity-Rating-Scale
+.. _`STRIDE threat analysis technique`: https://docs.microsoft.com/en-us/azure/security/develop/threat-modeling-tool-threats#stride-model
+.. _yEd: https://www.yworks.com/products/yed
+
+*Copyright (c) 2022, Arm Limited and Contributors. All rights reserved.*
+
+SPDX-License-Identifier: BSD-3-Clause