def fence_Crypto(msg,priority="row"):
'''
usage:
fence_Crypto(msg[, priority])->msg to encrypt or decrypt with fence crypto
args:
msg:
a plaintext which will be crypted or a ciphertext which will be decrypted
priority:
row priority or column priority,default is the former
return:
result:
if msg is plaintext,it contains all of possible ciphertext.
if msg is ciphertext,it contains all of possible plaintext
'''
msg_len = len(msg)
row_num = 1
result = []
if priority == "row":
while row_num<=msg_len:
temp = [msg[block_num::row_num] for block_num in xrange(row_num)]
result.append("".join(temp))
row_num += 1
return result
elif priority == "columns":
pass
else:
print "parameter error!please help(fence_Crypto)"
def caesar_Crypto(msg):
'''
usage:
caesar_Crypto(msg) ---> to encrypt or decrypt the msg with caesar crypto
'''
lowercase = 'abcdefghijklmnopqrstuvwxyz'
uppercase = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
result = []
offset = 1
while offset<=26:
temp = []
for char in msg:
if char in lowercase:
temp.append(chr(97 + (ord(char) - 97 + offset) % 26))
elif char in uppercase:
temp.append(chr(65 + (ord(char) - 65 + offset) % 26))
else:
temp.append(char)
string = "".join(temp)
print "[*]offset %d---------"%offset,string
result.append(string)
offset += 1
#return result
