What is the key size in bits used with the RC6 encryption algorithm?

The RC6 encryption algorithm is designed to accommodate a range of key sizes, allowing for flexibility based on security requirements. Unlike some encryption methods that have fixed key lengths, RC6 can operate with key sizes that vary from 1 to 128 bits. This adaptability makes it suitable for different applications and security standards.

The ability to specify key sizes within this range allows users to choose the level of security that best fits their needs while still leveraging the strengths of the algorithm. For instance, longer keys typically provide more robust security against brute-force attacks, while shorter keys may be sufficient for less sensitive applications. This versatility is a significant characteristic of RC6, and it distinguishes it from algorithms with a predetermined key size.