For symmetric ciphers, the same key is used in both the encryption and decryption algorithm. What the key is exactly depends on the encryption being used. Typically this key is only a series of bits, representing some number. This process uses some sort of key in the encryption and decryption algorithms. Then, that ciphertext is transmitted to another party who decrypts it to find the original message. This encryption algorithm will turn any plaintext data into ciphertext, an unreadable code. Like all forms of cryptography, the general process of symmetric key cryptography is to first encrypt a message. Symmetric ciphers are a good place to get started when learning cryptography as they were the first widespread systems used in modern computing. This eliminates the need to share the secret key. Because of its security concerns, however, it is often used on a single machine for encryption and decryption. The most popular of these is Advanced Encryption Standard (AES).
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Due to these pros, however, there are a number of important symmetric ciphers in production today. But they lack in other areas like security and key management. Symmetric ciphers have many important advantages, like speed. The public key is used to encrypt data, and the private key is used to decrypt data. Typically, those two keys are called public and private keys, as is the case with RSA encryption. These ciphers use asymmetric algorithms which use one key to encrypt data and a different key to decrypt ciphers.
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Symmetric ciphers are the opposite of asymmetric ciphers, like those used in public-key cryptography. Then, it uses k k k again to take that ciphertext and turn it back into the password.
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For example, a symmetric algorithm will use key k k k to encrypt some plaintext information like a password into a ciphertext. A symmetric algorithm uses the same key to encrypt data as it does to decrypt data. These ciphers are used in symmetric key cryptography. Symmetric ciphers use symmetric algorithms to encrypt and decrypt data.