def decrypt(cipher, shift=None):
ciphers = []
if shift == None:
for i in range(0, 26):
ciphers.append(decrypt(cipher, i))
scores = score_fitness(ciphers)
return ciphers[scores.index(max(scores))]
else:
return ''.join([chr(((ord(x)-65-shift) % 26) + 65) for x in cipher.upper() if x in 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'])
def decrypt(cipher, shift=None):
ciphers = []
if shift == None:
for i in range(0, 26):
ciphers.append(decrypt(cipher, i))
scores = score_fitness(ciphers)
return ciphers[scores.index(max(scores))]
else:
return ''.join([
chr(((ord(x) - 65 - shift) % 26) + 65) for x in cipher.upper()
if x in 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
])
def decrypt(cipher, a=None, b=None):
#if unknown a and b, make best guess. More accurate with
#longer cipher texts
if a==None or b==None:
canidates = []
for i in [1,3,5,7,11,13,17,19,23]:
for j in range(1,25):
canidates.append(decrypt(cipher,i,j))
scores = score_fitness(canidates)
return canidates[scores.index(max(scores))]
else:
a_i = 0
for i in range(1,25):
if (a * i) % 26 == 1:
a_i = i
break
return ''.join([chr( ( (a_i * (ord(x) - 65 - b) % 26) + 65) ) for x in cipher.upper() if x.isalpha()])
def decrypt(cipher, a=None, b=None):
#if unknown a and b, make best guess. More accurate with
#longer cipher texts
if a == None or b == None:
canidates = []
for i in [1, 3, 5, 7, 11, 13, 17, 19, 23]:
for j in range(1, 25):
canidates.append(decrypt(cipher, i, j))
scores = score_fitness(canidates)
return canidates[scores.index(max(scores))]
else:
a_i = 0
for i in range(1, 25):
if (a * i) % 26 == 1:
a_i = i
break
return ''.join([
chr(((a_i * (ord(x) - 65 - b) % 26) + 65)) for x in cipher.upper()
if x.isalpha()
])
def decrypt(cipher, n=None):
if n == None:
ciphers = []
for i in range(1, len(cipher)):
ciphers.append(decrypt(cipher, i))
scores = score_fitness(ciphers)
return ciphers[scores.index(max(scores))]
else:
cipherlen = len(cipher)
parts = [""] * n
count = cycle(range(0, n) + range(1, n - 1)[::-1])
for i in cipher:
index = count.next()
parts[index] += "x"
for i in range(0, n):
parts[i] = cipher[: len(parts[i])]
cipher = cipher[len(parts[i]) :]
count = cycle(range(0, n) + range(1, n - 1)[::-1])
plaintext = ""
for i in range(0, cipherlen):
index = count.next()
plaintext += parts[index][0]
parts[index] = parts[index][1:]
return plaintext
def decrypt(cipher, n=None):
if n == None:
ciphers = []
for i in range(1, len(cipher)):
ciphers.append(decrypt(cipher, i))
scores = score_fitness(ciphers)
return ciphers[scores.index(max(scores))]
else:
cipherlen = len(cipher)
parts = [''] * n
count = cycle(range(0, n) + range(1, n - 1)[::-1])
for i in cipher:
index = count.next()
parts[index] += 'x'
for i in range(0, n):
parts[i] = cipher[:len(parts[i])]
cipher = cipher[len(parts[i]):]
count = cycle(range(0, n) + range(1, n - 1)[::-1])
plaintext = ''
for i in range(0, cipherlen):
index = count.next()
plaintext += parts[index][0]
parts[index] = parts[index][1:]
return plaintext
