Which term is used to explain when bits are grouped together before applying the encryption? Substitution Cipher Block Cipher Symmetric Encryposion Asymmetric Encryption

The term used to explain when bits are grouped together before applying the encryption is "Block Cipher."<br /><br />In a block cipher, data is encrypted in fixed-size blocks, typically 64 or 128 bits. Each block is processed independently, and the same encryption algorithm is applied to each block. This method contrasts with stream ciphers, where data is encrypted one bit at a time.<br /><br />Here's a brief overview of the other terms for clarity:<br /><br />- **Substitution Cipher**: A method of encryption where units of plaintext are replaced with the corresponding ciphertext. Each unit is replaced with another unit according to a fixed system.<br /><br />- **Symmetric Encryption**: A type of encryption where the same key is used for both encryption and decryption. It can be implemented using either block ciphers or stream ciphers.<br /><br />- **Asymmetric Encryption**: Also known as public-key encryption, it uses a pair of keys: one for encryption (public key) and one for decryption (private key). This method is more complex and secure than symmetric encryption.<br /><br />So, the correct answer is "Block Cipher."