diff --git a/unit04_public_key/.DS_Store b/unit04_public_key/.DS_Store
index 96d0304..0b403d7 100644
Binary files a/unit04_public_key/.DS_Store and b/unit04_public_key/.DS_Store differ
diff --git a/unit04_public_key/lab/bill_public_key.txt b/unit04_public_key/lab/bill_public_key.txt
index aaf33af..114d8fa 100644
--- a/unit04_public_key/lab/bill_public_key.txt
+++ b/unit04_public_key/lab/bill_public_key.txt
@@ -1,31 +1,52 @@
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diff --git a/unit04_public_key/lab/gpg/1.asc b/unit04_public_key/lab/gpg/1.asc
deleted file mode 100644
index 6fbd2a6..0000000
--- a/unit04_public_key/lab/gpg/1.asc
+++ /dev/null
@@ -1,19 +0,0 @@
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------END PGP MESSAGE-----
- 
diff --git a/unit04_public_key/lab/gpg/1.key b/unit04_public_key/lab/gpg/1.key
deleted file mode 100644
index 28ffeec..0000000
--- a/unit04_public_key/lab/gpg/1.key
+++ /dev/null
@@ -1,41 +0,0 @@
------BEGIN PGP PUBLIC KEY BLOCK-----
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diff --git a/unit04_public_key/lab/gpg/1.txt b/unit04_public_key/lab/gpg/1.txt
deleted file mode 100644
index f866236..0000000
--- a/unit04_public_key/lab/gpg/1.txt
+++ /dev/null
@@ -1,551 +0,0 @@
-Content-Type: multipart/mixed; boundary="------------Q9IJzJbmgzms0FpJIe1ripWd";
- protected-headers="v1"
-Subject: Re: Your PGP message
-From: Declan Cox <40735779@live.napier.ac.uk>
-To: "Buchanan, Bill" <B.Buchanan@napier.ac.uk>
-Message-ID: <de131c24-841e-4570-81fe-5d1489a5a8e9@live.napier.ac.uk>
-References: <12D8938A-4206-4C9C-82B3-661D6668609E@napier.ac.uk>
-In-Reply-To: <12D8938A-4206-4C9C-82B3-661D6668609E@napier.ac.uk>
-
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-
---------------GOrClR0WgXDnMeRRniOlTk5Y
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- boundary="------------K0HW5cWO9VUuWVwtfQslxIjR"
-
---------------K0HW5cWO9VUuWVwtfQslxIjR
-Content-Type: text/plain; charset=UTF-8; format=flowed
-Content-Transfer-Encoding: 7bit
-
-Hi Bill,
-
-I hope you are well. I enjoyed your interview with Ivan Damgaard very 
-much, having spent a few years living in Denmark myself I especially 
-appreciated his insights into why he believes Denmark 'punches above 
-it's weight' in areas of technology and innovation. Great questions! One 
-other in the interview that I found fascinating was Zero Knowledge 
-Proofs - heard the term many times but it prompted me to look into it - 
-I hope to learn more while at Napier,
-
-Best regards,
-
-Declan
-
-
-On 21/02/2025 14:31, Buchanan, Bill wrote:
->
-> If you have not already done so, please send me your public key, and 
-> send me back and encrypted message using my public key [here 
-> <https://asecuritysite.com/public.txt>]:
->
-> -----BEGIN PGP PUBLIC KEY BLOCK-----
->
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->
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->
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->
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->
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->
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->
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->
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->
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->
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->
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->
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->
-> -----END PGP PUBLIC KEY BLOCK-----
->
-> *Details:*
->
-> 	
->
-> Prof. William (Bill) J Buchanan, OBE, FRSE (Fellow of the Royal 
-> Society of Edinburgh), PhD, PFHEA, CEng, BSc (Hons)
->
-> *Address:*
->
-> 	
->
-> Professor of Applied Cryptography, Edinburgh Napier University,
-> 10 Colinton Road, Edinburgh. EH10 5DT
->
-> *Tel:*
->
-> *My Web Site:*
->
-> *YouTube:*
->
-> *Wikipedia page:*
->
-> *LinkedIn:*
->
-> *Twitter:*
->
-> *My Blog:*
->
-> 	
->
-> +44 (0)131 455 2759
->
-> https://asecuritysite.com <https://asecuritysite.com>
->
-> https://www.youtube.com/billbuchanan 
-> <https://www.youtube.com/billbuchanan>
->
-> https://en.wikipedia.org/wiki/Bill_Buchanan_(computer_scientist) 
-> <https://en.wikipedia.org/wiki/Bill_Buchanan_(computer_scientist)>
->
-> https://www.linkedin.com/in/billatnapier/ 
-> <https://www.linkedin.com/in/billatnapier/>
->
-> https://twitter.com/billatnapier <https://twitter.com/billatnapier>
->
-> https://medium.com/asecuritysite-when-bob-met-alice 
-> <https://medium.com/asecuritysite-when-bob-met-alice>
->
->
-> 	
->
-> 	
->
-> *Research page:***
->
-> *Instagram:*
->
-> *Research: *
->
-> 	
->
-> https://napier-repository.worktribe.com/person/110736/bill-buchanan 
-> <https://napier-repository.worktribe.com/person/110736/bill-buchanan>
->
-> https://www.instagram.com/billatnapier 
-> <https://www.instagram.com/billatnapier>
->
-> [Google Scholar 
-> <https://scholar.google.com/citations?hl=en&user=ghqbp04AAAAJ&view_op=list_works&sortby=pubdate>][ResearchGate 
-> <https://www.researchgate.net/profile/William-Buchanan-3>][ORCID 
-> <https://orcid.org/0000-0003-0809-3523>][Arxiv 
-> <https://arxiv.org/search/cs?searchtype=author&query=Buchanan%2C+W+J>][DBLP 
-> <https://dblp.org/pid/04/5266.html>]
->
-> *Podcast:*
->
-> 	
->
-> Apple [here 
-> <https://podcasts.apple.com/us/podcast/a-security-podcast/id1617044319>] 
-> Spotify [here <https://open.spotify.com/show/3SX5sY2PqQowc3aA6xGoVO>]
->
---------------K0HW5cWO9VUuWVwtfQslxIjR
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-  <head>
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-  </head>
-  <body>
-    <p>Hi Bill, <br>
-    </p>
-    <p>I hope you are well. I enjoyed your interview with Ivan Damgaard
-      very much, having spent a few years living in Denmark myself I
-      especially appreciated his insights into why he believes Denmark
-      'punches above it's weight' in areas of technology and innovation.
-      Great questions! One other in the interview that I found
-      fascinating was Zero Knowledge Proofs - heard the term many times
-      but it prompted me to look into it - I hope to learn more while at
-      Napier, <br>
-    </p>
-    <p>Best regards,</p>
-    <p>Declan</p>
-    <p><br>
-    </p>
-    <div class="moz-cite-prefix">On 21/02/2025 14:31, Buchanan, Bill
-      wrote:<br>
-    </div>
-    <blockquote type="cite"
-      cite="mid:12D8938A-4206-4C9C-82B3-661D6668609E@napier.ac.uk">
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-          send me your public key, and send me back and encrypted
-          message using my public key [<a
-            href="https://asecuritysite.com/public.txt"
-            moz-do-not-send="true">here</a>]:<br>
-          <br>
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-        <p class="MsoNormal"><o:p> </o:p></p>
-        <p class="MsoNormal"><o:p> </o:p></p>
-        <p class="MsoNormal"><span
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-              <td width="149" valign="top"
-style="width:111.75pt;background:#E5E5E5;padding:0cm 5.4pt 0cm 5.4pt">
-                <p class="MsoNormal"><b><span
-style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:black;mso-fareast-language:EN-GB">Details:</span></b><span
-style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
-              </td>
-              <td width="1180" valign="top"
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-                <p class="MsoNormal"><span
-style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:black;mso-fareast-language:EN-GB">Prof.
-                    William (Bill) J Buchanan, OBE, FRSE (Fellow of the
-                    Royal Society of Edinburgh), PhD, PFHEA, CEng, BSc
-                    (Hons)</span><span
-style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
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-                <p class="MsoNormal"><b><span
-style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:black;mso-fareast-language:EN-GB">Address:</span></b><span
-style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
-              </td>
-              <td width="1180" valign="top"
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-                <p class="MsoNormal"><span
-style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:black;mso-fareast-language:EN-GB">Professor
-                    of Applied Cryptography, Edinburgh Napier
-                    University, <br>
-                    10 Colinton Road, Edinburgh. EH10 5DT</span><span
-style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
-              </td>
-            </tr>
-            <tr>
-              <td width="149" valign="top"
-style="width:111.75pt;background:#E5E5E5;padding:0cm 5.4pt 0cm 5.4pt">
-                <p class="MsoNormal"><b><span
-style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:black;mso-fareast-language:EN-GB">Tel:</span></b><span
-style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
-                <p class="MsoNormal"><b><span
-style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:black;mso-fareast-language:EN-GB">My
-                      Web Site:</span></b><span
-style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
-                <p class="MsoNormal"><b><span
-style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:black;mso-fareast-language:EN-GB">YouTube:<o:p></o:p></span></b></p>
-                <p class="MsoNormal"><b><span
-style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:black;mso-fareast-language:EN-GB">Wikipedia
-                      page:</span></b><span
-style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
-                <p class="MsoNormal"><b><span
-style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:black;mso-fareast-language:EN-GB">LinkedIn:</span></b><span
-style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
-                <p class="MsoNormal"><b><span
-style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:black;mso-fareast-language:EN-GB">Twitter:<o:p></o:p></span></b></p>
-                <p class="MsoNormal"><b><span
-style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:black;mso-fareast-language:EN-GB">My
-                      Blog:</span></b><span
-style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
-              </td>
-              <td width="1180" valign="top"
-style="width:885.0pt;background:white;padding:0cm 5.4pt 0cm 5.4pt">
-                <p class="MsoNormal"><span
-style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:black;mso-fareast-language:EN-GB">+44
-                    (0)131 455 2759</span><span
-style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
-                <p class="MsoNormal"><span
-style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:black;mso-fareast-language:EN-GB"><a
-                      href="https://asecuritysite.com"
-                      moz-do-not-send="true"><span style="color:#0563C1">https://asecuritysite.com</span></a>
-                  </span><span
-style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
-                <p class="MsoNormal"><span
-style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:black;mso-fareast-language:EN-GB"><a
-                      href="https://www.youtube.com/billbuchanan"
-                      moz-do-not-send="true"><span style="color:#0563C1">https://www.youtube.com/billbuchanan</span></a><o:p></o:p></span></p>
-                <p class="MsoNormal"><span
-style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:black;mso-fareast-language:EN-GB"><a
-href="https://en.wikipedia.org/wiki/Bill_Buchanan_(computer_scientist)"
-                      moz-do-not-send="true"><span style="color:#0563C1">https://en.wikipedia.org/wiki/Bill_Buchanan_(computer_scientist)</span></a><o:p></o:p></span></p>
-                <p class="MsoNormal"><span
-style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:black;mso-fareast-language:EN-GB"><a
-                      href="https://www.linkedin.com/in/billatnapier/"
-                      moz-do-not-send="true"><span style="color:#0563C1">https://www.linkedin.com/in/billatnapier/</span></a><o:p></o:p></span></p>
-                <p class="MsoNormal"><span
-style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:black;mso-fareast-language:EN-GB"><a
-                      href="https://twitter.com/billatnapier"
-                      moz-do-not-send="true"><span style="color:#0563C1">https://twitter.com/billatnapier</span></a>
-                    <o:p></o:p></span></p>
-                <p class="MsoNormal"><span
-style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:black;mso-fareast-language:EN-GB"><a
-href="https://medium.com/asecuritysite-when-bob-met-alice"
-                      moz-do-not-send="true"><span style="color:#0563C1">https://medium.com/asecuritysite-when-bob-met-alice</span></a>
-                  </span><span
-style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
-              </td>
-            </tr>
-            <tr>
-              <td width="149" valign="top"
-style="width:111.75pt;background:#E5E5E5;padding:0cm 5.4pt 0cm 5.4pt"> <br>
-              </td>
-              <td width="1180" valign="top"
-style="width:885.0pt;background:white;padding:0cm 5.4pt 0cm 5.4pt"> <br>
-              </td>
-            </tr>
-            <tr>
-              <td width="149" valign="top"
-style="width:111.75pt;background:#E5E5E5;padding:0cm 5.4pt 0cm 5.4pt"> <br>
-              </td>
-              <td width="1180" valign="top"
-style="width:885.0pt;background:white;padding:0cm 5.4pt 0cm 5.4pt"> <br>
-              </td>
-            </tr>
-            <tr>
-              <td width="149" valign="top"
-style="width:111.75pt;background:#E5E5E5;padding:0cm 5.4pt 0cm 5.4pt">
-                <p class="MsoNormal"><b><span
-style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:black;mso-fareast-language:EN-GB">Research
-                      page:</span></b><b><span
-style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;mso-fareast-language:EN-GB"><o:p></o:p></span></b></p>
-                <p class="MsoNormal"><b><span
-style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:black;mso-fareast-language:EN-GB">Instagram:<o:p></o:p></span></b></p>
-                <p class="MsoNormal"><b><span
-style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:black;mso-fareast-language:EN-GB">Research:
-                      <o:p></o:p></span></b></p>
-              </td>
-              <td width="1180" valign="top"
-style="width:885.0pt;background:white;padding:0cm 5.4pt 0cm 5.4pt">
-                <p class="MsoNormal"><span
-style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:black;mso-fareast-language:EN-GB"><a
-href="https://napier-repository.worktribe.com/person/110736/bill-buchanan"
-                      moz-do-not-send="true"><span style="color:#0563C1">https://napier-repository.worktribe.com/person/110736/bill-buchanan</span></a><o:p></o:p></span></p>
-                <p class="MsoNormal"><span
-style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:black;mso-fareast-language:EN-GB"><a
-                      href="https://www.instagram.com/billatnapier"
-                      moz-do-not-send="true"><span style="color:#0563C1">https://www.instagram.com/billatnapier</span></a><o:p></o:p></span></p>
-                <p class="MsoNormal"><span
-style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:black;mso-fareast-language:EN-GB">[<a
-href="https://scholar.google.com/citations?hl=en&amp;user=ghqbp04AAAAJ&amp;view_op=list_works&amp;sortby=pubdate"
-                      moz-do-not-send="true"><span style="color:#0563C1">Google
-                        Scholar</span></a>][<a
-href="https://www.researchgate.net/profile/William-Buchanan-3"
-                      moz-do-not-send="true"><span style="color:#0563C1">ResearchGate</span></a>][<a
-                      href="https://orcid.org/0000-0003-0809-3523"
-                      moz-do-not-send="true"><span style="color:#0563C1">ORCID</span></a>][<a
-href="https://arxiv.org/search/cs?searchtype=author&amp;query=Buchanan%2C+W+J"
-                      moz-do-not-send="true"><span style="color:#0563C1">Arxiv</span></a>][<a
-                      href="https://dblp.org/pid/04/5266.html"
-                      moz-do-not-send="true"><span style="color:#0563C1">DBLP</span></a>]<o:p></o:p></span></p>
-              </td>
-            </tr>
-            <tr>
-              <td width="149" valign="top"
-style="width:111.75pt;background:#E5E5E5;padding:0cm 5.4pt 0cm 5.4pt">
-                <p class="MsoNormal"><b><span
-style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:black;mso-fareast-language:EN-GB">Podcast:<o:p></o:p></span></b></p>
-              </td>
-              <td width="1180" valign="top"
-style="width:885.0pt;background:white;padding:0cm 5.4pt 0cm 5.4pt">
-                <p class="MsoNormal"><span
-style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:black;mso-fareast-language:EN-GB">Apple
-                    [<a
-href="https://podcasts.apple.com/us/podcast/a-security-podcast/id1617044319"
-                      target="_blank" moz-do-not-send="true"><span
-                        style="color:#0563C1">here</span></a>] Spotify [<a
-href="https://open.spotify.com/show/3SX5sY2PqQowc3aA6xGoVO"
-                      target="_blank" moz-do-not-send="true"><span
-                        style="color:#0563C1">here</span></a>]</span><span
-style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
-              </td>
-            </tr>
-          </tbody>
-        </table>
-        <p class="MsoNormal"><span
-style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:white"> </span><o:p></o:p></p>
-      </div>
-    </blockquote>
-  </body>
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diff --git a/unit04_public_key/lab/gpg/MSc Napier Distributed Key shares.docx b/unit04_public_key/lab/gpg/MSc Napier Distributed Key shares.docx
deleted file mode 100644
index aab8740..0000000
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diff --git a/unit04_public_key/lab/gpg/MSc Napier Privacy-aware signing.docx b/unit04_public_key/lab/gpg/MSc Napier Privacy-aware signing.docx
deleted file mode 100644
index 30817c8..0000000
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diff --git a/unit04_public_key/lab/gpg/PGP-MIME version identification b/unit04_public_key/lab/gpg/PGP-MIME version identification
deleted file mode 100644
index d446591..0000000
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diff --git a/unit04_public_key/lab/gpg/emailtobill.txt.asc b/unit04_public_key/lab/gpg/emailtobill.txt.asc
deleted file mode 100644
index cd1f2df..0000000
--- a/unit04_public_key/lab/gpg/emailtobill.txt.asc
+++ /dev/null
@@ -1,13 +0,0 @@
------BEGIN PGP MESSAGE-----
-
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diff --git a/unit04_public_key/lab/gpg/hello.txt b/unit04_public_key/lab/gpg/hello.txt
index 1cbf8c7..20ee372 100644
--- a/unit04_public_key/lab/gpg/hello.txt
+++ b/unit04_public_key/lab/gpg/hello.txt
@@ -1,5 +1,3 @@
-Hello.
-
-Thanks for the message.
+Thank you for the message. Here is a reply.
 
 -- Bill
diff --git a/unit04_public_key/lab/gpg/hello.txt.asc b/unit04_public_key/lab/gpg/hello.txt.asc
deleted file mode 100644
index 56299ee..0000000
--- a/unit04_public_key/lab/gpg/hello.txt.asc
+++ /dev/null
@@ -1,15 +0,0 @@
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diff --git a/unit04_public_key/lab/gpg/hello1.txt b/unit04_public_key/lab/gpg/hello1.txt
deleted file mode 100644
index b13970a..0000000
--- a/unit04_public_key/lab/gpg/hello1.txt
+++ /dev/null
@@ -1 +0,0 @@
-It is getting so difficult to tell online what is real and what is not; we really have to move towards public key signing of messages and content.
diff --git a/unit04_public_key/lab/gpg/hello1.txt.asc b/unit04_public_key/lab/gpg/hello1.txt.asc
deleted file mode 100644
index 2aa2102..0000000
--- a/unit04_public_key/lab/gpg/hello1.txt.asc
+++ /dev/null
@@ -1,20 +0,0 @@
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diff --git a/unit04_public_key/lab/gpg/hello2.txt b/unit04_public_key/lab/gpg/hello2.txt
deleted file mode 100644
index 011fa54..0000000
--- a/unit04_public_key/lab/gpg/hello2.txt
+++ /dev/null
@@ -1 +0,0 @@
-No problem.
diff --git a/unit04_public_key/lab/gpg/key.asc b/unit04_public_key/lab/gpg/key.asc
deleted file mode 100644
index f4a9034..0000000
--- a/unit04_public_key/lab/gpg/key.asc
+++ /dev/null
@@ -1,53 +0,0 @@
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diff --git a/unit04_public_key/lab/gpg/message3 b/unit04_public_key/lab/gpg/message3
deleted file mode 100644
index 7418c82..0000000
--- a/unit04_public_key/lab/gpg/message3
+++ /dev/null
@@ -1,25 +0,0 @@
------BEGIN PGP MESSAGE-----
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diff --git a/unit04_public_key/lab/gpg/msg01.txt b/unit04_public_key/lab/gpg/msg01.txt
deleted file mode 100644
index ee6d530..0000000
--- a/unit04_public_key/lab/gpg/msg01.txt
+++ /dev/null
@@ -1,20 +0,0 @@
------BEGIN PGP MESSAGE-----
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diff --git a/unit04_public_key/lab/gpg/myfile.asc b/unit04_public_key/lab/gpg/myfile.asc
deleted file mode 100644
index d5c5976..0000000
--- a/unit04_public_key/lab/gpg/myfile.asc
+++ /dev/null
@@ -1,17 +0,0 @@
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diff --git a/unit04_public_key/lab/mypub.key b/unit04_public_key/lab/mypub.key
deleted file mode 100644
index 61a59f1..0000000
--- a/unit04_public_key/lab/mypub.key
+++ /dev/null
@@ -1,52 +0,0 @@
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