diff --git a/Lab03/documentation/part1/part1.tex b/Lab03/documentation/part1/part1.tex
deleted file mode 100644
index 27176dc..0000000
--- a/Lab03/documentation/part1/part1.tex
+++ /dev/null
@@ -1,2 +0,0 @@
-\section{Part 1: Zzuf}
-
diff --git a/Lab04/content/bigrams.xlsx b/Lab04/content/bigrams.xlsx
new file mode 100644
index 0000000..4ec8162
Binary files /dev/null and b/Lab04/content/bigrams.xlsx differ
diff --git a/Lab04/content/hashes.txt b/Lab04/content/hashes.txt
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index 0000000..46ad439
--- /dev/null
+++ b/Lab04/content/hashes.txt
@@ -0,0 +1,5 @@
+john:$1$kSwpjBFv$VMtu0Mk6p06EUtVw5OLEY/
+jonas:$1$qPEx/5/4$4T0lDrIo5RnrDFH2rP7In/
+pony:$1$q1NwfAWz$5ulIYzhCjsLBsQjQ2CRRN1
+hannah:$1$ia1yKsCX$/Xdet.pCmIR3TdKoavIaP/
+root:$1$E2ST/4kf$6UnJsquPTK3S2lpLxShE/.
diff --git a/Lab04/content/plaintext.txt b/Lab04/content/plaintext.txt
new file mode 100644
index 0000000..6243834
--- /dev/null
+++ b/Lab04/content/plaintext.txt
@@ -0,0 +1,2 @@
+In cryptography, encryption is the process of encoding information. This process converts the original representation of the information, known as plaintext, into an alternative form known as ciphertext. Only authorized parties can decipher a ciphertext back to plaintext and access the original information. Encryption does not itself prevent interference but denies the intelligible content to a would-be interceptor. For technical reasons, an encryption scheme usually uses a pseudo-random encryption key generated by an algorithm. It is possible to decrypt the message without possessing the key, but, for a well-designed encryption scheme, considerable computational resources and skills are required. An authorized recipient can easily decrypt the message with the key provided by the originator to recipients but not to unauthorized users. Historically, various forms of encryption have been used to aid in cryptography. Early encryption techniques were often utilized in military messaging. Since then, new 
+techniques have emerged and become commonplace in all areas of modern computing. Modern encryption schemes utilize the concepts of public-key and symmetric-key. Modern encryption techniques ensure security because modern computers are inefficient at cracking the encryption.
\ No newline at end of file
diff --git a/Lab03/documentation/.gitignore b/Lab04/documentation/.gitignore
similarity index 100%
rename from Lab03/documentation/.gitignore
rename to Lab04/documentation/.gitignore
diff --git a/Lab03/documentation/bib/book.bib b/Lab04/documentation/bib/book.bib
similarity index 100%
rename from Lab03/documentation/bib/book.bib
rename to Lab04/documentation/bib/book.bib
diff --git a/Lab03/documentation/bib/online.bib b/Lab04/documentation/bib/online.bib
similarity index 100%
rename from Lab03/documentation/bib/online.bib
rename to Lab04/documentation/bib/online.bib
diff --git a/Lab03/documentation/images/hs-esslingen.eps b/Lab04/documentation/images/hs-esslingen.eps
similarity index 100%
rename from Lab03/documentation/images/hs-esslingen.eps
rename to Lab04/documentation/images/hs-esslingen.eps
diff --git a/Lab03/documentation/main.tex b/Lab04/documentation/main.tex
similarity index 98%
rename from Lab03/documentation/main.tex
rename to Lab04/documentation/main.tex
index 4d0a408..876c981 100644
--- a/Lab03/documentation/main.tex
+++ b/Lab04/documentation/main.tex
@@ -87,8 +87,8 @@
 }
 \AfterTOCHead[lof]{\appto\autodot{:}}
 
-\ihead{Lab 03 - ITSec}
-\chead{Fuzzing}
+\ihead{Lab 04 - ITSec}
+\chead{Cryptography}
 \ohead{Florian Hoss}
 \ofoot{Seite~\thepage{}/\pageref{LastPage}}
 \cfoot{}
diff --git a/Lab04/documentation/part1/part1.tex b/Lab04/documentation/part1/part1.tex
new file mode 100644
index 0000000..b44acdd
--- /dev/null
+++ b/Lab04/documentation/part1/part1.tex
@@ -0,0 +1,2 @@
+\section{Part 1: Substitution Cipher}
+
diff --git a/Lab03/documentation/titlepage/titlepage.tex b/Lab04/documentation/titlepage/titlepage.tex
similarity index 76%
rename from Lab03/documentation/titlepage/titlepage.tex
rename to Lab04/documentation/titlepage/titlepage.tex
index d0fbaa9..5d5e1b9 100644
--- a/Lab03/documentation/titlepage/titlepage.tex
+++ b/Lab04/documentation/titlepage/titlepage.tex
@@ -9,9 +9,9 @@
     \centering
     \Large
     \vlinespace{10}\\
-    Lab 3 - ITSec\\
+    Lab 4 - ITSec\\
     \huge
-    \textbf{Fuzzing}\\
+    \textbf{Cryptography}\\
     \Large
     \vlinespace{8}
     \huge
@@ -20,6 +20,6 @@
     \vfill
     \raggedright{}
     \HRule{13pt}{1pt} \\
-    \titleemph{Datum:} 02.05.2022 \\
-    \titleemph{Git:} \href{https://git.unjx.de/flo/SWB6-ITSec/src/branch/master/Lab03}{https://git.unjx.de/flo/SWB6-ITSec/src/branch/master/Lab03}
+    \titleemph{Datum:} 30.05.2022 \\
+    \titleemph{Git:} \href{https://git.unjx.de/flo/SWB6-ITSec/src/branch/master/Lab04}{https://git.unjx.de/flo/SWB6-ITSec/src/branch/master/Lab04}
 \end{titlepage}