Secret Key Cryptography, also known as symmetric encryption, is a method of encrypting data where the same key is used for both encryption and decryption. This means that both the sender and the receiver must possess the same secret key to securely communicate. If someone else obtains this key, they can easily access the encrypted information. In this system, the security of the communication relies heavily on keeping the key confidential. Common algorithms used in Secret Key Cryptography include AES (Advanced Encryption Standard) and DES (Data Encryption Standard). These algorithms help ensure that sensitive data remains protected from unauthorized access.