Add proposal for new security blueprint

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+# Part 1 - Hardware
+
+## Abstract
+
+You will find in this first part everything that concerns the hardware security.
+The goal is to protect system against all attacks that are trying to gain
+additional privileges by recovering and/or changing cryptographic keys in order
+to alter the integrity of the boot. We should also prevent hardware modifications
+in order to achieve this goal. We will expose below some examples of possible
+configurations.
+
+--------------------------------------------------------------------------------
+
+## Acronyms and Abbreviations
+
+The following table lists the terms utilized within this part of the document.
+
+Acronyms or Abbreviations | Description
+------------------------- | --------------------------------------
+_HSM_                     | **H**ardware **S**ecurity **M**odule
+_NVM_                     | **N**on-**V**olatile **M**emory
+_SHE_                     | **S**ecure **H**ardware **E**xtensions
+
+--------------------------------------------------------------------------------
+
+## Integrity
+
+The board must store hardcoded cryptographic keys in order to verify among others
+the _integrity_ of the _bootloader_. Manufacturers can use **HSM** and **SHE** to
+enhance the security of their board.
+
+<!-- config -->
+
+Domain               | Object     | Recommendations
+-------------------- | ---------- | ----------------------------------
+Hardware-Integrity-1 | Bootloader | Must control bootloader integrity.
+Hardware-Integrity-2 | Board      | Must use a HSM.
+Hardware-Integrity-3 | RTC        | Must not be alterable.
+
+<!-- endconfig -->
+
+--------------------------------------------------------------------------------
+
+<!-- pagebreak -->
+
+## Certificates
+
+<!-- config -->
+
+Domain                 | Object | Recommendations
+---------------------- | ------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------
+Hardware-Certificate-1 | System | Shall allow storing dedicated certificates.
+Hardware-Certificate-2 | ECU    | The ECU must verify the certification authority hierarchy.
+Hardware-Certificate-3 | System | Allow the modification of certificates only if the source can be authenticated by a certificate already stored or in the higher levels of the chain of trust.
+
+<!-- endconfig -->
+
+--------------------------------------------------------------------------------
+
+## Memory
+
+<!-- config -->
+
+Domain            | Object     | Recommendations
+----------------- | ---------- | ------------------------------------------------------------------------------------
+Hardware-Memory-1 | ECU        | The ECU shall never expose the unencrypted key in RAM when using cryptographic keys.
+Hardware-Memory-2 | Bootloader | Internal NVM only
+Hardware-Module-3 | -          | HSM must be used to secure keys.
+
+<!-- endconfig -->