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I'm going to demonstrate how to use open SSL to perform some public key cryptography operations the scenario will be there will be two users am both users will generate their public key pairs will use RSA as the public key cryptography algorithm I'll generate their RSA public and private keys then user a will take some message sign that message creates its digital signature of that message and encrypt the message also using RSA send to user B upon reception user B will decrypt the message and also verify the message making sure that it came from user a and not someone pretending to be user a purpose of the demonstration is to really show some basics of open SSL there may be better ways to do this both in open SSL and in other software first we're going to generate the public and private key pairs so with open SSL there are many operations you can see the main page of open SSL to see all those operations before we get started though just to confirm what version of open SSL I'm using is 1.00 e the version 1.0 supports some generic operations for public key cryptography if we man open SSL it lists the many commands and I scroll down the commands I'm going to use for this demo the generic forms of for public key cryptography like Gen P key as opposed to the specific forms like gen RSA and Gen DSA if you're using opens OpenSSL version before version one then they may not support those generic commands, and you may need to use gen RSA read the man page to see what commands are supported the first thing we want to do is to generate the public and private key pairs for a user, so we'll use the gen P key command to generate a private key specify the algorithm to use RSA for this demonstration and select some options for our key generation some private key options and the two options I'm going to set is the key length for RSA the main page for Gen P key explains these options the key length in bits I'm going to choose 2048 bits that is the modulus and in our essay will be 2048 bits in length another option I'm going to choose the value of the public exponent e RSA key gen public exponent, and I'm going to choose the value 3 by default if you don't give these options then the different I think the key length is a thousand and 24 bits and a different value of the public exponent key is chosen again the main page describes those default values, so this will generate a private key for RSA, and I'm going to output that to a fire call private key user a and the format PM is the default format there is an alternative format that can be used for the output of the key as well it generates the private key and now let's look at the private key the file has been generated I'll simply use cat, and so we don't scroll through the screen too fast pipe into less, and we see the private key doesn't make much sense there because this is base64 encoded to encode into a format that we can transfer easily over a network base64 encoding as users used, so this is the private key...
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