The purpose of symmetric encryption is to store and transmit data in an unsafe Internet environment. And only authorized people can decrypt Encryption.
Bilateral encryption uses a shared key between the transmitter
and the receiver. Encryption algorithms generate keys in a set of bits that are
used to encrypt and decrypt information. People communicating through symmetric
encryption must exchange a shared key to be used in the decryption process.
Using symmetric encryption, information is not comprehensible to people who do not have access to a secret key to unlock. The secret key used by both the sender and the receiver can be a password, a special code, or a random string of letters or numbers generated by the generator of the secure random number.