What is the block size used by the XTEA encryption algorithm?

The XTEA encryption algorithm utilizes a block size of 64 bits. This means that during the encryption process, the data is split into chunks that are 64 bits long. The choice of a 64-bit block size is essential for the algorithm's operation, influencing how it processes the data it encrypts.

Using a block size of 64 bits facilitates compatibility with various data formats and allows for efficient processing on many hardware platforms. While modern encryption algorithms often use larger block sizes like 128 bits (as seen in AES), XTEA remains effective for its intended applications. Therefore, while 32 bits is smaller and often inadequate for secure encryption, and 128 or 256 bits represent block sizes used by other algorithms, 64 bits is the definitive block size for XTEA.