Difference Between Symmetric and Asymmetric Key Encryption
Symmetric Key Encryption: Encryption is a process to change the form of any message in order to protect it from reading by anyone. In Symmetric-key encryption the message is encrypted by using a key and the same key is used to decrypt the message which makes it easy to use but less secure. It also requires a safe method to transfer the key from one party to another.
Asymmetric Key Encryption: Asymmetric Key Encryption is based on public and private key encryption techniques. It uses two different key to encrypt and decrypt the message. It is more secure than the symmetric key encryption technique but is much slower.
Symmetric Key Encryption | Asymmetric Key Encryption |
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It only requires a single key for both encryption and decryption. | It requires two keys, a public key and a private key, one to encrypt and the other to decrypt. |
The size of ciphertext is the same or smaller than the original plaintext. | The size of ciphertext is the same or larger than the original plaintext. |
The encryption process is very fast. | The encryption process is slow. |
It is used when a large amount of data needs to be transferred. | It is used to transfer small amount of data. |
It only provides confidentiality. | It provides confidentiality, authenticity, and non-repudiation. |
The length of key used is 128 or 256 bits | The length of key used is 2048 or higher |
In symmetric key encryption, resource utilization is low compared to asymmetric key encryption. | In asymmetric key encryption, resource utilization is high. |
It is efficient as it is used for handling large amount of data. | It is comparatively less efficient as it can handle a small amount of data. |
Security is lower as only one key is used for both encryption and decryption purposes. | Security is higher as two keys are used, one for encryption and the other for decryption. |
The Mathematical Representation is as follows- where K –> encryption and decryption key |
The Mathematical Representation is as follows- Kd –> decryption key |
Examples: 3DES, AES, DES and RC4 | Examples: Diffie-Hellman, ECC, El Gamal, DSA and RSA |
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