ctf decryptor

transpose.py

@@ -1,8 +1,9 @@
 import pprint
 import math
-# secret="OUHRSTHFSOENOFETURFELIRFTSNEMOEEMELNTARETOKCAETBFIHFTTTNMEELEEOHYBAERORCRSEDNCEUUTHITOYRSTEDSBEIEOTNLRMOEFPOHHAYLAGXYISNIARAUABGBURILFERPEEHTECDINNDITHFFIEHTKESYTDHEREOALGNABSMWEHVEFSOAMETAOCRFTAHEOFSINAMEOTRNGRINTHFFIEHTIEGMELNTSTEOMCOHEOWTEWREAIDANHTRARARTEHEETVFIYREAHVSAONDPROSTRAEUOYCTTTHWISANMUHETENTIISEDHETSUSENTEITNG   OOLEEB L"
+
-# first_col_key="EJALMVWUSTRPOBY" # missing 1 char
+secret="OUHRSTHFSOENOFETURFELIRFTSNEMOEEMELNTARETOKCAETBFIHFTTTNMEELEEOHYBAERORCRSEDNCEUUTHITOYRSTEDSBEIEOTNLRMOEFPOHHAYLAGXYISNIARAUABGBURILFERPEEHTECDINNDITHFFIEHTKESYTDHEREOALGNABSMWEHVEFSOAMETAOCRFTAHEOFSINAMEOTRNGRINTHFFIEHTIEGMELNTSTEOMCOHEOWTEWREAIDANHTRARARTEHEETVFIYREAHVSAONDPROSTRAEUOYCTTTHWISANMUHETENTIISEDHETSUSENTEITNG   OOLEEB L"
-# second_row_key="GHPTYPAMTAPQRNDHD" # missing 4 chars one of which is 'D'
+col_key="EJALMVWUSTRPOBY_" # (16)missing 1 char
+row_key="GHPTYPAMTAPQRNDHD____" # (21) missing 4 chars one of which is 'D'
 # KLINGON_ALPHABET="ABDEHIJLMNOPQRSTUVWY"
 # HIERACH_ALPHABET="ABDFGHIJKMNPQRSTUWYZ"
 # cleartext="ABDEFGHIJKLMOPQRSTUVWXYZ"
@@ -10,36 +11,97 @@ import math
 # my_row_key="HALLOABBIEGALE"
 
 
-def rows(text,row_key):
-    key_length=len(row_key)
-    row_length=math.ceil(len(text)/key_length)
-    rows=[text[i:i+key_length] for i in range(0,len(text),key_length)]
-    return mosh(rows,row_key)
 
-def cols(text,col_key):
+#As we know from the cold wars in the galaxy with the KLI, the Mondoshiva used the double transposition cipher with first/inner column and second/outer row transformation for encryption to secure the most powerful information. Furthermore, they usually used the longer keys for the rows
-    key_length=len(col_key)
-    col_length=math.ceil(len(text)/key_length)
-    cols=[ "" for char in col_key ]
-    cursor=0
-    for c in text:
-        cols[cursor%key_length]+=c
-        cursor += 1
-    return cols
 
 
-def get_index_key(key):
+def cell_length(text_length,key_length):
+    return math.ceil(text_length/key_length)
+
+def padded_length(text_length,key_length):
+    return cell_length(text_length,key_length)*key_length
+
+def revert_key(key):
     return [x[0] for x in sorted(enumerate(key), key=lambda x: x[1])]
 
 def mosh(text,key):
     tmp=sorted(zip(text,key), key=lambda x: x[1])
     return [x[0] for x in tmp]
 
-def cols_encode(text,cols_key):
-    return mosh(cols(text,cols_key),cols_key)
 
-#def cols_2_rows
+def cols(text,key_length):
+    # col_length=cell_length(len(text),key_length)
+    columns=[ "" for i in range(0,key_length) ]
+    cursor=0
+    for c in text:
+        columns[cursor%key_length]+=c
+        cursor += 1
+    return columns
 
-def cols_decode(text,cols_key):
+def rows(text,key_length):
-    rows=rows(text)
+    # row_length=math.ceil(len(text)/key_length)
-    reorderd=mosh(rows,cols_key)
+    rows=[text[i:i+key_length] for i in range(0,len(text),key_length)]
-    return reorderd
+    return rows
+
+def cols_to_str(a):
+    max_length=max([len(i) for i in a] )
+    result=""
+    for i in range(0,max_length):
+        for x in a:
+            try:
+                result+=x[i]
+            except:
+                pass
+    return result
+
+def rows_to_str(a):
+    return "".join(a)
+
+def pcols(a):
+    print("COLUMS:")
+    text=cols_to_str(a)
+    split_text=rows(text,len(a))
+    for x in split_text:
+        print(x)
+
+def prows(a,header=None):
+    print("ROWS:")
+    counter=0
+    for x in a:
+        if header:
+            heading="{}".format(header[counter]).ljust(5)
+        else:
+            heading="{}".format(counter).ljust(5)
+        counter+=1
+        print("%s : %s"%(heading,x))
+
+
+def encode(text,key):
+    text=text.ljust(math.ceil(len(text)/len(key))*len(key),'_')
+    print("encoding <%s>"%text)
+    columnized_text=cols(text,len(key))
+    pcols(columnized_text)
+    shuffled_colums=mosh(columnized_text,key)
+    pcols(shuffled_colums)
+    return rows_to_str(shuffled_colums)
+
+def decode(text,key):
+    print("decoding <%s>"%text)
+    row_data=rows(text,cell_length(len(text), len(key)))
+    prows(row_data)
+    reorderd=mosh(row_data,revert_key(key))
+    prows(reorderd)
+    return cols_to_str(reorderd)
+
+
+def decross(text,key_rows,key_cols):
+    #revert row transformation
+    matrix_cells=len(key_rows)*len(key_cols)
+    if len(text) != matrix_cells:
+        print("!!TEXT HAD TO BE PADDED!!")
+        text=text.ljust(matrix_cells,'_')
+    #generate rows with a length of the column-key
+    matrix=rows(text,len(key_cols))
+    prows(matrix,key_rows)
+
+decross(secret,row_key,col_key)