coisas

trabalho1/afreq.py

@@ -1,3 +1,9 @@
+import sys
+
+if len(sys.argv) < 2:
+    print("Usage: python3 afreq.py [arquivo]")
+    sys.exit(1)
+
 frequencias = {
     'A': 14.63,
     'B': 1.04,
@@ -27,6 +33,10 @@ frequencias = {
     'Z': 0.47
 }
 
+frequencias = sorted(frequencias.keys(), key=lambda x: frequencias[x])
+frequencias.reverse()
+caracteres = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'
+
 def afreq(string):
     # determinar a frequencia de cada caractere na string
     # comparar com a frequencia de cada caractere na lingua portuguesa
@@ -42,19 +52,29 @@ def afreq(string):
         else:
             str_freq[c] = 1
 
-    for c in str_freq:
-        if not c.isalnum():
-            continue
+    freq_sorted = sorted(str_freq.items(), key=lambda item: item[1])
+    freq_sorted = [x[0] for x in freq_sorted]
+    freq_sorted.reverse()
 
-        str_freq[c] /= len(string)
-
-    freq_sorted = dict(sorted(str_freq.items(), key=lambda item: item[1]))
+    print(freq_sorted[0], frequencias[0])
+    print(freq_sorted[1], frequencias[1])
 
     possiveis_chaves = []
-    for c in frequencias:
-        for k in freq_sorted:
-            if abs(frequencias[c] - freq_sorted[k]) < 0.5:
-                possiveis_chaves.append(ord(k) - ord(c))
+
+    for i, c in enumerate(frequencias):
+        if c not in freq_sorted:
+            continue
+
+        index_c = caracteres.index(c)
+        index_freq = caracteres.index(freq_sorted[i])
+
+        print(c, index_c, index_freq)
+
+        possiveis_chaves.append((index_freq - index_c) % 26) # (indice da freq da letra na str - indice da letra em PT) % ignorar letras maiusculas
 
     return possiveis_chaves
 
+file_str = open(sys.argv[1], 'r').read()
+possiveis_chaves = afreq(file_str)
+
+print(possiveis_chaves)

trabalho1/cesar.py

@@ -39,6 +39,8 @@ special_chars = {
     ")": ")"
 }
 
+caracteres = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'
+
 def cesar(string, key):
     new_string = ""
 
@@ -50,26 +52,28 @@ def cesar(string, key):
         if letter in special_letters:
             letter = special_letters[letter]
 
-        new_letter = ord(letter) + key
+        index = caracteres.index(letter)
+        new_index = (index + key) % len(caracteres)
+        new_letter = caracteres[new_index]
 
-        # [A-Z, a-z, 0-9]
-        if ord('0') <= ord(letter) <= ord('9'):
-            if new_letter > ord('9'):
-                new_letter += 7 # 9 + 1 = A
-            elif new_letter < ord('0'):
-                new_letter += 75 # 0 - 1 = z
-        elif letter.isupper():
-            if new_letter > ord('Z'):
-                new_letter += 6 # Z + 1 = a
-            elif new_letter < ord('A'):
-                new_letter -= 7 # A - 1 = 9
-        else:
-            if new_letter > ord('z'):
-                new_letter -= 75 # z + 1 = 0
-            elif new_letter < ord('a'):
-                new_letter -= 6 # a - 1 = Z
+        # # [A-Z, a-z, 0-9]
+        # if ord('0') <= ord(letter) <= ord('9'):
+        #     if new_letter > ord('9'):
+        #         new_letter += 7 # 9 + 1 = A
+        #     elif new_letter < ord('0'):
+        #         new_letter += 75 # 0 - 1 = z
+        # elif letter.isupper():
+        #     if new_letter > ord('Z'):
+        #         new_letter += 6 # Z + 1 = a
+        #     elif new_letter < ord('A'):
+        #         new_letter -= 7 # A - 1 = 9
+        # else:
+        #     if new_letter > ord('z'):
+        #         new_letter -= 75 # z + 1 = 0
+        #     elif new_letter < ord('a'):
+        #         new_letter -= 6 # a - 1 = Z
 
-        new_string += chr(new_letter)
+        new_string += new_letter
 
     return new_string
 

trabalho1/input.txt

@@ -0,0 +1 @@
+Pouco conhecimento faz com que as pessoas se sintam orgulhosas. Muito conhecimento, que se sintam humildes. Eh assim que as espigas sem graos erguem desdenhosamente a cabeca para o ceu, enquanto as cheias as baixam para a terra, sua mae. Leonardo Da Vinci.

trabalho1/texto.txt

@@ -0,0 +1,6 @@
+g5Bt5 t54yvtz3v4A5 wrG t53 7Bv r9 6v995r9 9v 9z4Ar3
+58xB2y59r9. dBzA5 t54yvtz3v4A5, 7Bv 9v 9z4Ar3
+yB3z2uv9. Vy r99z3 7Bv r9 v96zxr9 9v3 x8r59 v8xBv3
+uv9uv4y59r3v4Av r trsvtr 6r8r 5 tvB, v47Br4A5 r9
+tyvzr9 r9 srzEr3 6r8r r Av88r, 9Br 3rv.
+cv54r8u5 Ur mz4tz.

trabalho1/vernam.py

@@ -0,0 +1,22 @@
+import sys
+
+if len(sys.argv) != 3:
+    print("Usage: python3 vernam.py [key] [string]")
+    sys.exit(1)
+
+key = sys.argv[1]
+string = sys.argv[2]
+
+if len(string) != len(key):
+    print("Key and string must have the same length")
+    sys.exit(1)
+
+encrypted = ""
+
+for i in range(len(string)):
+    encrypted += chr(ord(string[i]) ^ ord(key[i]))
+    # print(ord(string[i]) ^ ord(key[i]))
+
+print(encrypted)
+
+# python3 vernam.py ABCDEF TOMATE | xargs python3 vernam.py ABCDEF