What’s RSA and what is its role in creating a digital envelope?

Hello Corin Ronie, RSA stands for Rivest Shamir Adleman algorithm. It is usually used in cryptography and steganography. This algorithm changes the plain text into cipher text. There are 2 keys. One is public key and other one is private key. Public keyused only for encrpt the text or message whereas private key is used to decypte the message back into plain text.