Add proposal for new security blueprint

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+# Utilities
+
+- **busybox**: Software that provides several stripped-down Unix tools in a
+  single executable file. Of course, it will be necessary to use a "production"
+  version of **busybox** in order to avoid all the tools useful only in
+  development mode.
+
+<!-- config -->
+
+Domain               | `Tool` name | _State_
+-------------------- | ----------- | ----------------------------------------------------------------------
+Platform-Utilities-1 | `busybox`   | _Used_ to provide a number of tools. Do not compile development tools.
+
+<!-- endconfig -->
+
+## Functionalities to exclude in production mode
+
+In production mode, a number of tools must be disabled to prevent an attacker
+from finding logs for example. This is useful to limit the visible surface and
+thus complicate the fault finding process. The tools used only in development
+mode are marked by an '**agl-devel**' feature. When building in production mode,
+these tools will not be compiled.
+
+<!-- config -->
+
+Domain                | `Utility` name and normal `path`                     | _State_
+--------------------- | ---------------------------------------------------- | ----------
+Platform-Utilities-1  | `chgrp` in `/bin/chgrp`                              | _Disabled_
+Platform-Utilities-2  | `chmod` in `/bin/chmod`                              | _Disabled_
+Platform-Utilities-3  | `chown` in `/bin/chown`                              | _Disabled_
+Platform-Utilities-4  | `dmesg` in `/bin/dmesg`                              | _Disabled_
+Platform-Utilities-5  | `Dnsdomainname` in `/bin/dnsdomainname`              | _Disabled_
+Platform-Utilities-6  | `dropbear`, Remove "dropbear" from `/etc/init.d/rcs` | _Disabled_
+Platform-Utilities-7  | `Editors` in (vi) `/bin/vi`                          | _Disabled_
+Platform-Utilities-8  | `find` in `/bin/find`                                | _Disabled_
+Platform-Utilities-9  | `gdbserver` in `/bin/gdbserver`                      | _Disabled_
+Platform-Utilities-10 | `hexdump` in `/bin/hexdump`                          | _Disabled_
+Platform-Utilities-11 | `hostname` in `/bin/hostname`                        | _Disabled_
+Platform-Utilities-12 | `install` in `/bin/install`                          | _Disabled_
+Platform-Utilities-13 | `iostat` in `/bin/iostat`                            | _Disabled_
+Platform-Utilities-14 | `killall` in `/bin/killall`                          | _Disabled_
+Platform-Utilities-15 | `klogd` in `/sbin/klogd`                             | _Disabled_
+Platform-Utilities-16 | `logger` in `/bin/logger`                            | _Disabled_
+Platform-Utilities-17 | `lsmod` in `/sbin/lsmod`                             | _Disabled_
+Platform-Utilities-18 | `pmap` in `/bin/pmap`                                | _Disabled_
+Platform-Utilities-19 | `ps` in `/bin/ps`                                    | _Disabled_
+Platform-Utilities-20 | `ps` in `/bin/ps`                                    | _Disabled_
+Platform-Utilities-21 | `rpm` in `/bin/rpm`                                  | _Disabled_
+Platform-Utilities-22 | `SSH`                                                | _Disabled_
+Platform-Utilities-23 | `stbhotplug` in `/sbin/stbhotplug`                   | _Disabled_
+Platform-Utilities-24 | `strace` in `/bin/trace`                             | _Disabled_
+Platform-Utilities-25 | `su` in `/bin/su`                                    | _Disabled_
+Platform-Utilities-26 | `syslogd` in (logger) `/bin/logger`                  | _Disabled_
+Platform-Utilities-27 | `top` in `/bin/top`                                  | _Disabled_
+Platform-Utilities-28 | `UART` in `/proc/tty/driver/`                        | _Disabled_
+Platform-Utilities-29 | `which` in `/bin/which`                              | _Disabled_
+Platform-Utilities-30 | `who` and `whoami` in `/bin/whoami`                  | _Disabled_
+Platform-Utilities-31 | `awk` (busybox)                                      | _Enabled_
+Platform-Utilities-32 | `cut` (busybox)                                      | _Enabled_
+Platform-Utilities-33 | `df` (busybox)                                       | _Enabled_
+Platform-Utilities-34 | `echo` (busybox)                                     | _Enabled_
+Platform-Utilities-35 | `fdisk` (busybox)                                    | _Enabled_
+Platform-Utilities-36 | `grep` (busybox)                                     | _Enabled_
+Platform-Utilities-37 | `mkdir` (busybox)                                    | _Enabled_
+Platform-Utilities-38 | `mount` (vfat) (busybox)                             | _Enabled_
+Platform-Utilities-39 | `printf` (busybox)                                   | _Enabled_
+Platform-Utilities-40 | `sed` in `/bin/sed` (busybox)                        | _Enabled_
+Platform-Utilities-41 | `tail` (busybox)                                     | _Enabled_
+Platform-Utilities-42 | `tee` (busybox)                                      | _Enabled_
+Platform-Utilities-43 | `test` (busybox)                                     | _Enabled_
+
+<!-- endconfig --> <!-- note -->
+
+The _Enabled_ Unix/Linux utilities above shall be permitted as they are often
+used in the start-up scripts and for USB logging. If any of these utilities are
+not required by the device then those should be removed.
+
+<!-- endnote -->