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cipher.py
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cipher.py
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# Cifra de Cesar
# Cifra de Vigenere
# Cifra de Atbash
# Cifra da palavra-chave
# Deixar as funções com parametros opcionais para case sensitive, start, end
import collections
import base64
bacon_to_letter_26 = {
'aaaaa':'A', 'aaaab':'B', 'aaaba':'C', 'aaabb':'D', 'aabaa':'E',
'aabab':'F', 'aabba':'G', 'aabbb':'H', 'abaaa':'I', 'abaab':'J',
'ababa':'K', 'ababb':'L', 'abbaa':'M', 'abbab':'N', 'abbba':'O',
'abbbb':'P', 'baaaa':'Q', 'baaab':'R', 'baaba':'S', 'baabb':'T',
'babaa':'U', 'babab':'V', 'babba':'W', 'babbb':'X', 'bbaaa':'Y',
'bbaab':'Z'
}
letter_to_bacon_26 = { value : key for (key, value) in bacon_to_letter_26.items() }
def frequencyAnalysis(msg):
# Recomendado com msgs de pelo menos 50 caracteres
return collections.Counter(msg.upper()).most_common()
def caesarDec(msg):
start = 97
end = 122
colection = []
msg = msg.lower()
for i in range(start, end+1):
colection.append(chr(i))
for i in range(0,(end-start)+1):
msgDec = ''
for char in msg:
if char in colection:
num = ord(char)
if (num + i) > end:
num = ((num + i) % end) + (start - 1)
else:
num = num + i
msgDec = msgDec + chr(num)
else:
msgDec = msgDec + char
print('Rot [' + str(i).zfill(2) + '] : ' + msgDec)
def caesarEnc(msg, rot):
start = 97
end = 122
msg = msg.lower()
msgEnc = ''
colection = []
for i in range(start, end+1):
colection.append(chr(i))
for char in msg:
if char in colection:
num = ord(char)
if (num + rot) > end:
num = ((num + rot) % end) + (start - 1)
else:
num = num + rot
msgEnc = msgEnc + chr(num)
else:
msgEnc = msgEnc + char
print('MsgEnc: ' + msgEnc)
return msgEnc
def vigenereEnc(msg, key):
start = 97
end = 122
msg = msg.lower()
msgEnc = ''
colection = []
size = len(key)
for i in range(start, end+1):
colection.append(chr(i))
i = 0
for char in msg:
if char in colection:
num = ord(char)
if i >= size:
i = 0
if (num + ord(key[i]) - start) > end:
num = ((num + ord(key[i]) - start) % end) + (start - 1)
else:
num = num + ord(key[i]) - start
msgEnc = msgEnc + chr(num)
i = i + 1
else:
msgEnc = msgEnc + char
print('MsgEnc: ' + msgEnc)
return msgEnc
def vigenereDec(msg, key):
start = 97
end = 122
msg = msg.lower()
msgDec = ''
colection = []
size = len(key)
for i in range(start, end+1):
colection.append(chr(i))
i = 0
for char in msg:
if char in colection:
num = ord(char)
if i >= size:
i = 0
if (num - ord(key[i]) + start) < start:
num = (num - ord(key[i]) + end + 1)
else:
num = num - ord(key[i]) + start
msgDec = msgDec + chr(num)
i = i + 1
else:
msgDec = msgDec + char
print('MsgDec: ' + msgDec)
return msgDec
def atbashEnc(msg):
start = 97
end = 122
msg = msg.lower()
msgEnc = ''
for char in msg:
if (ord(char) >= start) and (ord(char) <= end):
dif = ord(char) - start
msgEnc = msgEnc + chr(end - dif)
else:
msgEnc = msgEnc + char
print('MsgEnc: ' + msgEnc)
return msgEnc
def atbashDec(msg):
start = 97
end = 122
msg = msg.lower()
msgDec = ''
for char in msg:
if (ord(char) >= start) and (ord(char) <= end):
dif = end - ord(char)
msgDec = msgDec + chr(start + dif)
else:
msgDec = msgDec + char
print('MsgDec: ' + msgDec)
return msgDec
def keywordEnc(msg, key):
start = 97
end = 122
msg = msg.lower()
key = key.lower()
msgEnc = ''
colection = list(key)
for i in range(0, len(colection) - 1):
if colection[i] in colection[0:i]:
colection.pop(i)
for i in range(start, end+1):
if chr(i) not in colection:
colection.append(chr(i))
for char in msg:
if (ord(char) >= start) and (ord(char) <= end):
dif = ord(char) - start
msgEnc = msgEnc + colection[dif]
else:
msgEnc = msgEnc + char
print('MsgEnc: ' + msgEnc)
return msgEnc
def keywordDec(msg,key):
start = 97
end = 122
msg = msg.lower()
key = key.lower()
msgDec = ''
colection = list(key)
for i in range(0, len(colection) - 1):
if colection[i] in colection[0:i]:
colection.pop(i)
for i in range(start, end+1):
if chr(i) not in colection:
colection.append(chr(i))
for char in msg:
if (ord(char) >= start) and (ord(char) <= end):
dif = colection.index(char)
msgDec = msgDec + chr(start + dif)
else:
msgDec = msgDec + char
print('MsgDec: ' + msgDec)
return msgDec
def baconDec(msg):
words = msg.split()
msgDec = ''
for word in words:
msgDec = msgDec + bacon_to_letter_26[word]
print('MsgDec: ', msgDec)
return msgDec
def baconEnc(msg):
letters = list(msg)
msgEnc = ''
for i in letters:
msgEnc = msgEnc + letter_to_bacon_26[i] + ' '
print('MsgEnc: ', msgEnc)
return msgEnc
# Ainda não está funcionando
def oneTimePad(msg, key):
# convertendo string para bytes e dps para base64
msg = base64.b64encode(msg.encode('utf-8'))
key = base64.b64encode(key.encode('utf-8'))
result = msg ^ key
print('Msg: '+ result)