def detect_possible_key(coded_text, key_len):
# split text into groups based on founded key len and xor with ' ' (space)
groups = [coded_data[i:i+key_len] for i in range(0, len(coded_data), key_len)]
possible_key = ''
for i in range(key_len):
freq = {}
scaned_chars = 0
for item in groups:
# check if text part not less that current index
if i < len(item):
char = sk.str_xor(item[i], ' ')
if char in freq:
freq[char] += 1
else:
freq[char] = 1
scaned_chars += 1
freq = {k: float(v)/scaned_chars for k, v in freq.items()}
key_char = sorted(freq.items(), key = lambda item: item[1], reverse = True)[0]
possible_key += key_char[0]
return possible_key
for item in groups:
# check if text part not less that current index
if i < len(item):
char = sk.str_xor(item[i], ' ')
if char in freq:
freq[char] += 1
else:
freq[char] = 1
scaned_chars += 1
freq = {k: float(v)/scaned_chars for k, v in freq.items()}
key_char = sorted(freq.items(), key = lambda item: item[1], reverse = True)[0]
possible_key += key_char[0]
return possible_key
if __name__ == '__main__':
coded_data = ''
with open("encryptedtext.txt", 'rb') as f:
coded_data = f.read()
# find key length
key_len = detect_key_len(coded_data)
print key_len
possible_key = detect_possible_key(coded_data, key_len)
print sk.str_xor(coded_data, possible_key)
print "This text encoded by key: %s" % (possible_key)
freq = {}
scaned_chars = 0
for item in groups:
# check if text part not less that current index
if i < len(item):
char = sk.str_xor(item[i], ' ')
if char in freq:
freq[char] += 1
else:
freq[char] = 1
scaned_chars += 1
freq = {k: float(v)/scaned_chars for k, v in freq.items()}
key_char = sorted(freq.items(), key = lambda item: item[1], reverse = True)[0]
possible_key += key_char[0]
return possible_key
if __name__ == '__main__':
coded_data = ''
with open(argv[1], 'rb') as f:
coded_data = f.read()
# find key length
key_len = detect_key_len(coded_data)
possible_key = detect_possible_key(coded_data, key_len)
print sk.str_xor(coded_data, possible_key)
print "This text encoded by key: %s" % (possible_key)
def detect_possible_key(coded_text, key_len):
# split text into groups based on founded key len and xor with ' ' (space)
groups = [coded_data[i:i+key_len] for i in range(0, len(coded_data), key_len)]
possible_key = ''
for i in range(key_len):
freq = {}
scaned_chars = 0
for item in groups:
# check if text part not less that current index
if i < len(item):
char = sk.str_xor(item[i], ' ')
if char in freq:
freq[char] += 1
else:
freq[char] = 1
scaned_chars += 1
freq = {k: float(v)/scaned_chars for k, v in freq.items()}
key_char = sorted(freq.items(), key = lambda item: item[1], reverse = True)[0]
possible_key += key_char[0]
return possible_key
