def decryptBlock(block):
letters = {}
for i in block:
if letters.has_key(i):
letters[i] +=1
else:
letters[i] = 1
y = alph.alphToCode(sorted(letters.items(), key = operator.itemgetter(1))[-1:][0][0])
x = alph.alphToCode(alph.most_frequent[0])
k = findK(x,y)
decryptedBlock = []
for i in block:
yCode = alph.alphToCode(i)
letter = (yCode - k) % alph.m
decryptedBlock.append(alph.codeToAlph(letter))
return (decryptedBlock, alph.codeToAlph(k))
def encipherText(text,key):
r = len(key)
lst = []
for i in range(len(text)):
lst.append((alph.alphToCode(text[i])+alph.alphToCode(key[i%r]))%alph.m)
enciphered = ''
for i in lst:
enciphered += alph.codeToAlph(i)
return enciphered
def dec(key,text):
newText =''
for i in range(len(text)):
x = (alph.alphToCode(text[i]) - alph.alphToCode(key[i % 17])) % alph.m
newText += alph.codeToAlph(x)
return newText