feat: ex a2d

sheet01/a2/d.txt

@@ -0,0 +1,29 @@
+The custom hash is adding the unicode values of each character, the amount of rows and the amount of characters each multiplied with a hex value.
+This leads to it giving the same output when switching around rows, or even putting all characters into one line and adding the required amount of empty lines behind that. 
+
+
+"""
+LJVeuiolknitaaornrdia
+
+
+"""
+
+is producing the same hash as
+
+"""
+Leonard
+Viktoria
+Julian
+"""
+
+and the same as
+
+"""
+Julian
+Leonard
+Viktoria
+"""
+
+It has a good enough "first pre-image resistance" since it is not really possible to find the correct characters in the same order from the hash value that give the same original file
+The "second pre-image resistance" is weak since you can easily calculate a different file which gives the same output.
+It has no collision resistance since you can just switch around characters and get the same hash.