C&C
In public key cryptography, there are 2 keys. One is public and other is private. If something is encrypted using the public key, it can only be decrypted using the private key. Therefore, all e-commerce merchants publicize their public keys. They also securely maintain their private key. Private Key should never be revealed. Anyone who wants to contact the merchant encrypts his information using the merchant's key and only the merchant can decrypt this information. Note that once encrypted, not even the
Since we do not want to distribute our private key to customers, we will encrypt license key using our private key. So, with this little background, we need to generate 2 keys (private and public) for xxx. Here, xxx is initiating a transaction and information is flowing towards the customers (in the form of license key). Again, this pair of public and private keys will be unique for business. There is one private key (which we keep securely) and one public key which we distribute to anyone who wants to talk securely with us. For every license, the same private key will be used to encrypt the license and same public key will be decrypting the license. The keys can be generated using OpenSSL as follows:openssl genrsa -out private. The public key will be embedded in the product code. pem 248 This key contains both the public and private keys and to separate the public key we can use :openssl rsa -in private. pem -outform PEM -puboutThe public key can now be embedded in all xxx products (see example at the end of this document), and private key is securely maintained by us. Please note that there is ONLY one pair of such keys. In case of license keys, there is a slight difference. Using this public key, only xxx products will be capable of decrypting the licenses and using them.
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