In cryptography, a symmetric key is a key used to encrypt and decrypt information. So what exactly is Symmetric Key Cryptography and what is the difference between asymmetric and symmetric key encryption. Let’s find out by reading the article below.
What is Symmetric Key Cryptography?
Symmetric key cryptography, also known as symmetric encryption, refers to the use of keys for both encryption and decryption functions. This method is the opposite of asymmetric encryption, where one key is used for encryption and the other is used for decryption. During this process, the data is transformed into a format that cannot be read or inspected by anyone without the key used to encrypt it.
What is the difference between asymmetric and symmetric key encryption?
In today's world, scammers and other cybercriminals are on the rise, affecting millions of users. To prevent these people from stealing our data, we must encrypt everything. Fortunately, you can use three different encryption methods: symmetric encryption, asymmetric encryption, and hash functions (without keys).
Asymmetric Key Encryption
- It requires two keys, a public key and a private key, one for encryption and one for decryption.
- The size of the ciphertext is equal to or larger than the original plaintext.
- The encryption process is slow.
- It is used to transfer small amounts of data.
- It provides confidentiality, authenticity and non-repudiation.
- Use a key length of 2048 or higher
- In asymmetric key encryption, resource utilization is high.
- It is relatively inefficient because it can only handle small amounts of data.
- It's more secure because two keys are used here - one for encryption and the other for decryption.
Symmetric Key Encryption
- It requires only one key for encryption and decryption.
- The size of the ciphertext is equal to or smaller than the original plaintext.
- The encryption process is very fast.
- Use it when large amounts of data need to be transferred.
- It only provides confidentiality.
- Use key lengths of 128 or 256 bits
- In symmetric key encryption, resource utilization is lower compared to asymmetric key encryption.
- It is efficient because it is used to process large amounts of data.
- Less secure because only one key is used for encryption and decryption purposes.
I hope this article will help you to learn what exactly is Symmetric Key Cryptography and what is the difference between asymmetric and symmetric key encryption. One encryption method is not better than another. It's just a different way of encrypting. The user must take care that he/she follows the best security practices at all times.
