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Of course similar questions have been asked in stackoverflow but I don't want to use any third party library like Crypto or something. So I need to generate a ciphertext from a user email and decrypt it back to plaintext. How can I do this in python?
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Python has no built-in encryption schemes, no. You also should take encrypted data storage serious; trivial encryption schemes that one developer understands to be insecure and a toy scheme may well be mistaken for a secure scheme by a less experienced developer. If you encrypt, encrypt properly.
The result of this encryption is known as a “Fernet token” and has strong privacy and authenticity guarantees. data (bytes) – The message you would like to encrypt. A secure message that cannot be read or altered without the key. It is URL-safe base64-encoded.
A third-party system is your best bet.
If you really can't/don't want to use a third-party, maybe something simple would suffice.
One of the simpler algorithms is the Tiny Encryption Algorithm (TEA). Here's an example of a Python implementation that you could start with.
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Yes, you can. Read http://www.amk.ca/python/code/crypto.html You'll find an answer there ;)
You're question is not concrete enough to say more. You may want to read http://en.wikipedia.org/wiki/Cryptography#Modern_cryptography
Cheers, Tuergeist
Update: No, you cannot. (with build in functionality due to export restrictions, see http://docs.python.org/library/crypto.html) But you can, if you're implementing you own algorithm (bad idea). So, the BEST solution is, to use the extension recommended by python core developers. See post above.
Cheers again.
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