Use Python's Crypto module which supports AES. You need a symmetric key (same key used to encrypt and decrypt). The same key can be generated in both server and client if the same passphrase and the initialization vector(IV) are used.
Summary: 1. Same key to be used to encrypt and decrypt 2. Use Crypto.Cipher.AES
AES has methods to generate key, encrypt and decrypt data. Following links have the actual code. pycrypto stackoverflow
Client - Call this method to encrypt your data and send the encrypted data
from Crypto.Cipher import AES
def do_encrypt(message):
obj = AES.new('This is a key123', AES.MODE_CBC, 'This is an IV456')
ciphertext = obj.encrypt(message)
return ciphertext
Server - Receive data and call this method to decrypt the data
from Crypto.Cipher import AES
def do_decrypt(ciphertext):
obj2 = AES.new('This is a key123', AES.MODE_CBC, 'This is an IV456')
message = obj2.decrypt(ciphertext)
return message
This is a sample code, make sure you choose a strong passphrase and IV.
Answer from helloV on Stack OverflowSending Encrypted strings using socket in Python - Stack Overflow
RSA Encrypting through socket programming
encryption - How to encrypt string with AES and decrypt it in python with server and client in Python - Stack Overflow
python - How do I encrypt the source code on the webserver? - Software Engineering Stack Exchange
Videos
Once your customer has a program they can run, they will be able to reverse engineer it given sufficient time & skill. That is just a fact of life.
If you really want to stop it, you should host and run the software yourself (SaaS)
Having said that, something like Python will be easier than C. Let's split this into the 3 parts you asked about (and then some more)
HTML
No matter what you do here, it will be decrypted in the browser (even in the SaaS model), so encrypting it on the server is pointless. Even minifying is pointless as modern browsers like Firefox and Chrome will neatly format it for them.
CSS
See above - don't waste your time
Javascript
Yahoo has a tool that can obfuscate it for you. Try YUI Compressor. Not, don't both encrypting this on the server-side as it must be served to the client unecrypted*, which would defeat the purpose.
Python
This is the only place you really want to spend your time - protecting your business logic. There are several methods you will find on google such as encrypting on disk and then decrypting at run-time. All these methods have problems, such as performance hits and having to supply the decrypter (hence enabling them to decrypt it anyone).
Your best beat to stop those not hellbent on stealing your code would be to use an obfuscate your Python code.
Summary
The only code you can stop someone from getting is the code you don't give them. HTML, CSS & Javascript will always end up on your users machine in a manner they can use, so assume they be able to steal it if they want, tough luck.
To protect your server code, the only sure-fire method is to NOT give it to them, running it in something like a SaaS model.
If that isn't possible, the best you can do is make it harder for them.
Testing
Always make sure you test on the production version you will be supplying your customers. This ensures any special build steps (such as obfuscation & minification) do not break your software.
Boring Business Stuff
So all of the above (and your question) has addressed this issue from the technical side. The other side of the coin is from the business/legal side.
If you have a small number of clients you can provide different "watermarked" versions of your software to each client. By doing this, you increase the possibility being able to track stolen software back to the source and take whatever legal action is appropriate.
Don't forgot, if you are in a serious business, you would be best to consult a lawyer on how you can prove and enforce the ownership of your software, should things go wrong.
* not strictly true, you could serve it encrypted and have other Javascript decrypt it on the fly, but this would be near pointless as it adds a performance hit and you will have to supply the attacker with the decrypter anyway...
No.
HTMl, CSS, and JavaScript Cannot be encryption as the Browser needs to read it as Plain text. The best you can do is Obfuscate it.
For Python you could compile it into a DLL, so you are not outright giving the client the source code. But is can still be De-compiled.
For Arguments Sake, lets say provided a Custom Web server for your clients to use this Custom Web server reads Encrypted Python files then compiles and runs them. A hacker could still De-compiled the Custom Web server and get full access to the decryption module and the Encryption keys.
If you Code (or data) in any form, is on someone else hardware, The code can be stolen.
My proof of this : Just look at all the warez sites, everything gets hacked.
Here is a solution, for small letters only. It can easily be modified to handle also capital letters, by adding them to the text strings.
As can be seen, the space character is at the same position in both lists. This is not necessary, as any character can be translated to any other. However if the decrypted or encrypted is not containing unique characters only, the program will break down.
Copydecrypted = b"abcdefghijklmnopqrstuvwxyz "
encrypted = b"qwertyuiopasdfghjklzxcvbnm "
encrypt_table = bytes.maketrans(decrypted, encrypted)
decrypt_table = bytes.maketrans(encrypted, decrypted)
result = ''
choice = ''
message = ''
while choice != '0':
choice = input("\n Do you want to encrypt or decrypt the message?\n 1 to encrypt, 2 to decrypt or 0 to exit program. ")
if choice == '1':
message = input('\nEnter message for encryption: ')
result = message.translate(encrypt_table)
print(result + '\n\n')
elif choice == '2':
message = input('\nEnter message to decrypt: ')
result = message.translate(decrypt_table)
print(result + '\n\n')
elif choice != '0':
print('You have entered an invalid input, please try again. \n\n')
Ok, so a few things here...
First I'll give you exactly what you were looking for and explain what I used and some of the changes that needed to be made to your original code. Then I'll explain some inherent issues what what you're trying to do and suggest some areas to read up on/some ways you might want to improve what you've got.
Here's the code you're looking for (while retaining the same flow as what you submitted put above):
Copyimport random
result = ''
choice = ''
message = ''
characters_in_order = [chr(x) for x in range(32,127)]
while choice != 0:
choice = input("\n Do you want to encrypt or decrypt the message?\n 1 to encrypt, 2 to decrypt or 0 to exit program. ")
if str(choice) == '1':
message = input('\nEnter message for encryption: ')
r_seed = input('Enter an integer to use as a seed: ')
random.seed(r_seed)
shuffled_list = [chr(x) for x in range(32,127)]
random.shuffle(shuffled_list)
for i in range(0, len(message)):
result += shuffled_list[characters_in_order.index(message[i])]
print(result + '\n\n')
result = ''
elif str(choice) == '2':
message = input('\nEnter message to decrypt: ')
r_seed = input('Enter an integer to use as a seed (should be the same one used to encrypt): ')
random.seed(r_seed)
shuffled_list = [chr(x) for x in range(32,127)]
random.shuffle(shuffled_list)
for i in range(0, len(message)):
result += characters_in_order[shuffled_list.index(message[i])]
print(result + '\n\n')
result = ''
elif str(choice) != '0':
print('You have entered an invalid input, please try again. \n\n')
You'll notice that I set a global 'characters in order' list, which is just every ASCII character (32-126) in order. I also imported the 'random' module and used this to shuffle the characters in order according to a seed that the user inputs. As long as this seed is the same on the encryption and decryption end, it will produce the same shuffled list and it should work to encrypt or decipher the same string. Also notice the str() around your input choices. Without that, the user had to input '1', rather than 1 to submit a choice without an error.
All of that said...
- Notice that the way the new function works is by looking at a character's index in one list and pulling out the character at that index in another. The method you were using, of incrementing or decrementing a character's ASCII code is basic (though not much more basic than this), but it also has a pretty critical flaw, which is that characters on one end or another of the ASCII set wouldn't return ASCII characters. If you were encrypting it at a bit-level, which would be preferred, this wouldn't matter/would be irrelevant, but here you're not going to get the kind of string back that you want if you were to, for example, enter a [space] (ASCII 32) into your plaintext to be encrypted.
- If you're interested, you might want to read up on symmetric key encryption/DES for some ideas on how encryption is really done, though props on the start/interest and this can certainly be a fun way to create some sort of cryptogram puzzle or something along those lines. I won't pretend to be any kind of expert, but I can at least point you in the write direction. (https://en.wikipedia.org/wiki/Data_Encryption_Standard https://en.wikipedia.org/wiki/Symmetric-key_algorithm)
- Consider having your code read in a .txt file and print out to a .txt file, rather than using user input for the message.
Again, I'm not an expert by any means and there are definitely some fun uses of the kind of program you're aiming for, just trying to point you in the right direction if this is something that you're interested in. Hope all of that is helpful!
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