What is the block size used by the symmetric block cipher Camellia?

The block size used by the Camellia symmetric block cipher is 128 bits. This means that Camellia processes data in blocks of 128 bits at a time during encryption and decryption.

Camellia is designed to be a flexible and secure cipher with key sizes of 128, 192, or 256 bits; however, the block size is fixed at 128 bits, which aligns it with other modern block ciphers like AES. This consistency is important for performance and security standards, as it allows for efficient processing in hardware and software implementations, making Camellia suitable for various applications.

Understanding the block size is essential because it affects how data is handled in cryptographic processes, including padding schemes for data that doesn't perfectly fit into a block. Hence, knowing that Camellia utilizes a 128-bit block size is a fundamental aspect of its structure and functionality.