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Whenever we disclose any of our private information (or any type of info that might hamper our lives if it gets into the wrong hands) to an authority online, we always have second thoughts about how communication networks work and if they'll be able to keep our information secure.
So to end this uncertainty to some extent, you’ll get to know how public-key cryptography (asymmetric cryptography) helps carry out the exchange of our information over the internet securely in this article.
SSL security is all about encryption of data over two nodes. The safe transfer over an internet connection is attained due to encryption performed by the SSL system.
Now, I can list n-numbers of examples that could prove its necessity for our daily transmission or transactions process.
In my previous article, I presented the concept of symmetric encryption, where the same key is used to encrypt and decrypt data. The biggest limitation of symmetric encryption is the key itself. The key used for encryption and decryption has to be kept a secret. If the key is compromised, the encrypted data is no longer secure. While you may feel that it will be easy to keep the key safe, consider the fact that the same key cannot be used to encrypt data between multiple parties. For example, if Alice and Bob agree to use a secret key X for exchanging their messages, the same key X cannot be used to exchange messages between Alice and Jane. This is because such messages can be decrypted by Bob as well. Hence, in addition to keeping the key a secret, each pair that wishes to communicate secretly will have to maintain a key for their conversation.
This problem is overcome by the concept of public key/private key encryption (also known as Public Key Encryption or PKE for short).