Which encryption method uses a block size of 128 bits?

Camellia is the encryption method that uses a block size of 128 bits. This symmetric key block cipher was designed to provide a high level of security while maintaining performance in both hardware and software environments. The choice of a 128-bit block size aligns with modern cryptographic standards, making it suitable for numerous applications, especially in contexts requiring strong data encryption.

In comparison, Blowfish has a block size of 64 bits, which limits its effectiveness in handling larger data sizes securely. Twofish, while also a modern encryption method, offers a flexible block size of 128 bits, but it is essential to note that the question specifically pertains to Camellia as the correct answer. Finally, 3DES operates on data in 64-bit blocks, utilizing three iterations of the DES algorithm, which also reflects a smaller block size than the 128 bits specified in the question. Overall, Camellia's characteristics as a block cipher make it an appropriate answer when considering a block size of 128 bits.