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It will also print the following ciphertext to the screen: #OUTPUT If all goes well, the code above will produce two new files on disk in the same folder as the script: public_key.pem and private_key.pem. It will look like gibberish because it is encrypted.

We simply print the ciphertext to the screen.

It will return the encrypted plaintext message as ciphertext.

The method cipher.encrypt() takes one parameter message and it will actually encrypt it using the key previously specified.

The method PKCS1_OAEP.new() will accept the RSA key object as parameter key and return a cipher object of type PKCS1OAEP_Cipher that can be used to do the actual encryption or decryption of the data.

We define the public key as parameter extern_key which is the RSA key to import.

The RSA.import_key() method will import the public key to be used to encrypt, from the certificate on disk.

Ideally, the public certificate should be publicly available and the private certificate should be kept private. This message will be encrypted with the public key certificate public_key.pem as per the RSA algorithm.

We define the message to be encrypted in bytes as message.

Recall that a key is simply a string of text.

We generate our public and private RSA certificates to disk as public_key.pem and private_key.pem respectively, as usual.

We do the usual imports to generate our RSA public/private certificate pair but this time we include an extra method PKCS1_OAEP which will be used to create the cipher object to encrypt our plaintext with the key that is in the certificate.

Key = RSA.import_key(open('public_key.pem').read()) Public_key = new_key.publickey().exportKey("PEM")

Then you write the following code: from Crypto.Cipher import PKCS1_OAEP Once you are up to speed, you can jump into the following code to encrypt data with an RSA Public Key, But first, ensure you install the pycryptodomex module: pip install pycryptodomex To understand what we’re doing here, please check out our two foundation tutorials on RSA Encryption: Hi! Let’s encrypt some data using an RSA Public Key Certificate in Python.