On 10/12/12 22:38, qbai...@ihets.org wrote:
I need help with a program i am doing. it is a cryptography program. i am given
a regular alphabet and a key. i need to use the user input and use the regular
alphabet and use the corresponding letter in the key and that becomes the new
letter. i have the basic code but need help with how to mainpulate the string
to do the encryption/decryption. please help
here is my code so far:
""" crypto.py
Implements a simple substitution cypher
"""
alpha = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
key = "XPMGTDHLYONZBWEARKJUFSCIQV"
def main():
keepGoing = True
while keepGoing:
response = menu()
if response == "1":
plain = raw_input("text to be encoded: ")
print encode(plain)
elif response == "2":
coded = raw_input("code to be decyphered: ")
print decode(coded)
elif response == "0":
print "Thanks for doing secret spy stuff with me."
keepGoing = False
else:
print "I don't know what you want to do..."
i really need help on how to encrypt it im not sure how to go about doing that
please help.
>>> alpha = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
>>> key = "XPMGTDHLYONZBWEARKJUFSCIQV"
>>> mapping = {}
>>> for i, ch in enumerate(alpha):
mapping[ch] = key[i]
>>> ''.join(mapping[ch] for ch in "ACE")
'XMT'
>>> ''.join(mapping[ch] for ch in "WORD")
'CEKG'
>>>
Duncan
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