Wrote doc and added ciphertext file as input

project3/README.md

@@ -1,17 +1,32 @@
 Project 3
 =========
 
-Seconds sine 22. June 2009 00:00:00:
+A simple Python script for cracking a known ciphertext with known
+encryption algorithm.
 
-    1245646800
-
-Seconds since 28. June 2009:
 
-    1246251599
-
-This gives an interval of `604799` seconds.
+## Content
+
+ * `Breaker.py` - The script used for breaking the ciphertext
+ * `ciphertext.txt` - The file containing the ciphertext
+ * `plaintext.txt` - The produced plaintext from the ciphertext
+
+
+## Usage
 
+To decipher the ciphertext, run the `Breaker.py` script with an input
+file, containing the ciphertext:
+
+    $ python Breaker.py ciphertext_sheet3.txt
 
-[Source](http://www.unixtimestamp.com/index.php)
+This will produce a file called plaintext.txt, if it is successful.
+
+
+## Logic
 
+The script essentially runs a smart brute-force attack. 
 
+As we know the time period the file was decrypted, we take all the
+possible times and iterates over them. For each relevant time encrypt
+each letter with the given algorithm, and see if the result contains
+any of the words in our array of known plaintext words.