diff --git a/.DS_Store b/.DS_Store
index 5ffafda..bd66951 100644
Binary files a/.DS_Store and b/.DS_Store differ
diff --git a/unit04_public_key/.DS_Store b/unit04_public_key/.DS_Store
index 836cc4b..fb873be 100644
Binary files a/unit04_public_key/.DS_Store and b/unit04_public_key/.DS_Store differ
diff --git a/unit04_public_key/lab/gpg/bill.key b/unit04_public_key/lab/gpg/bill.key
new file mode 100644
index 0000000..61a59f1
--- /dev/null
+++ b/unit04_public_key/lab/gpg/bill.key
@@ -0,0 +1,52 @@
+-----BEGIN PGP PUBLIC KEY BLOCK-----
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+-----END PGP PUBLIC KEY BLOCK-----
diff --git a/unit04_public_key/lab/gpg/fred.key b/unit04_public_key/lab/gpg/fred.key
new file mode 100644
index 0000000..190c3d4
--- /dev/null
+++ b/unit04_public_key/lab/gpg/fred.key
@@ -0,0 +1,41 @@
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+
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+-----END PGP PUBLIC KEY BLOCK-----
diff --git a/unit04_public_key/lab/gpg/gpgcmds b/unit04_public_key/lab/gpg/gpgcmds
new file mode 100644
index 0000000..b109046
--- /dev/null
+++ b/unit04_public_key/lab/gpg/gpgcmds
@@ -0,0 +1,4 @@
+gpg --import otherkey.key
+gpg --list-keys
+gpg -e -a -u "Bill Buchanan" -r "Fred Smith" hello.txt
+gpg -d myfile.asc > myfile.txt
diff --git a/unit04_public_key/lab/gpg/hello.txt b/unit04_public_key/lab/gpg/hello.txt
new file mode 100644
index 0000000..e965047
--- /dev/null
+++ b/unit04_public_key/lab/gpg/hello.txt
@@ -0,0 +1 @@
+Hello
diff --git a/unit04_public_key/lab/gpg/hello.txt.asc b/unit04_public_key/lab/gpg/hello.txt.asc
new file mode 100644
index 0000000..5013764
--- /dev/null
+++ b/unit04_public_key/lab/gpg/hello.txt.asc
@@ -0,0 +1,14 @@
+-----BEGIN PGP MESSAGE-----
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+-----END PGP MESSAGE-----
diff --git a/unit04_public_key/lab/gpg/myfile.txt b/unit04_public_key/lab/gpg/myfile.txt
new file mode 100644
index 0000000..e965047
--- /dev/null
+++ b/unit04_public_key/lab/gpg/myfile.txt
@@ -0,0 +1 @@
+Hello
diff --git a/unit04_public_key/lab/mypub.key b/unit04_public_key/lab/mypub.key
new file mode 100644
index 0000000..61a59f1
--- /dev/null
+++ b/unit04_public_key/lab/mypub.key
@@ -0,0 +1,52 @@
+-----BEGIN PGP PUBLIC KEY BLOCK-----
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+-----END PGP PUBLIC KEY BLOCK-----
diff --git a/unit04_public_key/lab/new_lab04.docx b/unit04_public_key/lab/new_lab04.docx
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