use *.asciidoc(i) extension instead of *.adoc(i)

Signed-off-by: Olivier Gayot <duskcoder@gmail.com>

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-== PGPv8 Practical, Week 11 ==
-
-The purpose of this practical is to learn how to use PGP for encrypting and
-decrypting data.
-
-At the end of the practical, we should be able to verify the authenticity of
-emails using digital signatures. Moreover, we should be able to encrypt emails
-so that only the desired people can decrypt them.
-
-=== Problem 1: generating enough entropy ===
-
-Because entropy is mainly generated by hardware components, it is quite
-difficult to generate it quickly on a virtual machine which lacks hardware
-access.
-
-To generate our key quickly, we generate it (using 'gpg --gen-key') on a
-dedicated machine. But then we have to find a way to export it to our VM (using
-a trusted channel).
-
-==== Resolution ====
-
-A quick look at the manpage 'gpg (1)' gives us the following commands
-('D417B848' being our key ID). 'gpg' will prompt us our passphrase.
-
-    $ gpg --export-secret-keys D417B348 > key.asc
-
-Then, using 'rsync', we can upload our 'key.asc' file.
-
-Last but not least, back to our virtual machine, we can import the key using:
-
-    $ gpg --import key.asc
-
-=== Problem 2: testing the key to sign an email ===
-
-We will now try to sign an email with our private key and see if a client can
-verify our signature depending if he possesses our public key or not.
-
-==== Resolution ====
-
-Using 'mutt', we send en email signed with our private key. On another machine,
-we use it again to fetch the new emails. 'mutt' gives us the following warning:
-
-    > gpg: Signature made Sat 17 Jan 2015 14:45:31 GMT using RSA key ID D417B348
-    > gpg: Can't check signature: public key not found
-
-That output confirms us that this client cannot verify our signature because he
-does not possess our public key. We will now install it on his machine using:
-
-    $ gpg --recv-keys --keyserver keyserver.ubuntu.com D417B348
-
-This time, 'mutt' gives us the following information:
-
-    > PGP signature successfully verified.
-
-=== Problem 3: testing the key to encrypt an email ===
-
-This time, we want to encrypt an email with someone's public key so that only
-the ones possessing the associated private key will be able to decrypt it.
-
-==== Resolution ====
-
-Using, 'mutt', we encrypt the following email using the public key 'D417B348'
-and send it to an account accessible from our virtual machine.
-
-    > Can you see this content ?
-
-On the virtual machine, 'mutt' prompts us our passphrase. After entering it, we
-obtain the following decrypted output which confirms that we just succeeded.
-
-    > [-- The following data is PGP/MIME encrypted --]
-    >
-    > Can you see this content?
-    >
-    > [-- End of PGP/MIME encrypted data --]
-