Mostly for performance - symmetric encryption is much much faster (order of magnitudes) than asymmetric encryption.
A key is used to encipher something. The same key can be used to decipher it.
Symmetric encryption requires that both parties (sender and receiver) know and have the exact same encryption key. This key is used both for encrypting and decrypting the data. Using the same encryption algorithm means that only those individuals that know or have the same key will be able to read any messages encrypted by the symmetric key.
A: Symmetric
A shared secret keyand other words;Both the sender and receiver share the same key
The term "symmetric encryption" refers to a form of computerized cryptography that uses a singular encryption key to guise an electronic message so that it can be sent in a secure manner.
In symmetric key techniques there is a single key and that key is kept secret. Symmetric key is a like a sub part of classical encryption.
Symmetric-key algorithms are a class of algorithms for cryptography that use trivially related, often identical, cryptographic keys for both decryption and encryption.
Symmetric key encryption is also called secret key encryption. In this method, the same key is used for both encryption and decryption, meaning that both the sender and recipient must securely share and maintain this key. This type of encryption is efficient for processing large amounts of data but requires secure key management to prevent unauthorized access.
A shared secret key.
Mostly for performance - symmetric encryption is much much faster (order of magnitudes) than asymmetric encryption.
Symmetric
Twofish, Advanced Encryption Standard, Blowfish, Serpent, CAST 5, RC4, TDES, and IDEA are all examples of symmetric encryption methods. In short, any algorithm that uses the same or similar cryptographic keys for encryption and decryption is a symmetric encryption method. Symmetric encryption methods are also divided into two different categories, stream ciphers and block ciphers. These two encryption methods are much like the difference between an interpreter and a compiler in programming. Stream encrypts individual bytes one at a time, while Block encrypts volumes as a whole.