What is the key size used by the Blowfish encryption algorithm?

Blowfish is a block cipher designed to offer a robust level of security while maintaining high encryption speeds. The key size used by the Blowfish encryption algorithm ranges from 32 bits to 448 bits. This variability allows users to select a key size that best fits their security needs and performance criteria.

The broader key size range contributes significantly to the flexibility and strength of the Blowfish algorithm, enabling it to secure data against modern attack vectors by providing a spectrum of levels in cryptographic security. With a maximum key size of 448 bits, Blowfish can potentially resist brute-force attacks more effectively than many other encryption methods with smaller key sizes.

This versatility in key size is a key characteristic of Blowfish, making it suitable for various applications and environments requiring encryption, thereby justifying the selected answer.