diff --git a/unit04_public_key/lab/GTrueCrypt.docx b/unit04_public_key/lab/GTrueCrypt.docx
new file mode 100644
index 0000000..a1c2d71
Binary files /dev/null and b/unit04_public_key/lab/GTrueCrypt.docx differ
diff --git a/unit04_public_key/lab/new_lab04.docx b/unit04_public_key/lab/new_lab04.docx
index c7345f5..e1bc971 100644
Binary files a/unit04_public_key/lab/new_lab04.docx and b/unit04_public_key/lab/new_lab04.docx differ
diff --git a/unit04_public_key/lab/new_lab04.pdf b/unit04_public_key/lab/new_lab04.pdf
index 62b68fe..3f9ac6f 100644
Binary files a/unit04_public_key/lab/new_lab04.pdf and b/unit04_public_key/lab/new_lab04.pdf differ
diff --git a/unit04_public_key/lab/priv.pem b/unit04_public_key/lab/priv.pem
new file mode 100644
index 0000000..5aaa611
--- /dev/null
+++ b/unit04_public_key/lab/priv.pem
@@ -0,0 +1,10 @@
+-----BEGIN EC PARAMETERS-----
+BgUrgQQAIw==
+-----END EC PARAMETERS-----
+-----BEGIN EC PRIVATE KEY-----
+MIHcAgEBBEIAUaE9AuJOdanvoEIwrpknwknPPjeeBZ1c6TUetsSy49jQp+F8LM0Z
+qpJCYIJ7UUzAzmx9ljHuE8orGBx+D3jVEZ2gBwYFK4EEACOhgYkDgYYABAC/3PfQ
+i+WZ2ApzMaeh39WV4hFfN2wawvyRvWv1k+VOxAJABDOe+X1QwutmofMvOScZNHS/
+MKmq1x4E/2q9lS8jIQGwuJE65j/yA1zTnLy9Ci7dNcVNIpMWI2gCzkeVWVt7chd7
+OiO2wjc2MdnUcD9Eix1JDJnM8LbuwDm3ai79+YMxeg==
+-----END EC PRIVATE KEY-----