What key size is employed in the XTEA algorithm?

The XTEA algorithm employs a key size of 128 bits. XTEA, which stands for eXtended Tiny Encryption Algorithm, is a block cipher that was designed to provide a means of secure data encryption. The choice of 128 bits as a key size allows for a significant level of security, as it enables over 3.4 x 10^38 possible key combinations. This level of complexity makes the algorithm resistant to brute-force attacks, ensuring that encrypted data remains secure.

Moreover, XTEA is an evolution of the original TEA (Tiny Encryption Algorithm) and was developed to address certain vulnerabilities found in its predecessor. The use of a 128-bit key length aligns with modern standards for cryptographic strength, making it suitable for a wide range of applications that require reliable encryption.

Understanding this aspect of the XTEA algorithm is crucial for recognizing its security features in practical applications, contributing to a deeper comprehension of cryptographic principles overall.