Public/Private Key RSA Encryption

I previously wrote about Python Encryption, this is a follow-up article on additional features of this tool.

Having someone send you an encrypted value

If you want someone to send you encrypted details, you can have them do so without requiring them to use the rsa_crypto library. You can for instance ask people to use the Online RSA Encryption, Decryption And Key Generator Tool(Free) website. Under "RSA Encryption", have them paste the content of your RSA Public key in "Enter Public/Private key"(don't include the "-----BEGIN PUBLIC KEY-----" and "-----END PUBLIC KEY-----" lines), which you can obtain using:

Under "Select Cipher Type" select "RSA/ECB/OAEPWithSHA-1AndMGF1Padding". Type the value you want to encrypt under "Enter Plain Text to Encrypt", click "Encrypt" and have them send you the content of the "Encrypted Output (Base64):" field.

It's that easy! 

Decrypting the encrypted value

You can also decrypt the value using that same website...but I don't know who runs it and I would never paste my private key on any website I don't fully trust. I would personally decrypt the values on a system with the rsa_crypto library installed (see Python Encryption for additional details on how to get started). Just edit the .rsa_values.conf file and add the value that was sent to you in the file, for instance as an option named database_password in the DEV section:

To decrypt the value using the default encryption key, use:

Fairly straightforward!

Encrypting and Decrypting files

The rsa_crypto library can also be used to encrypt and decrypt entire files by using the "-f" option. To encrypt a file named my_file, simply use:

Note that the original file is still present, the encrypted file has the same name but with a .enc extension.

To decrypt the file, you can use:

Note that the decrypted file will overwrite the original if it is present without any warning, please test before using this option.