Future Business Leaders of America (FBLA) Cybersecurity Practice Test

What is the maximum key length for the Twofish encryption algorithm?

1. 128 bits

2. 192 bits

3. 256 bits

4. 512 bits

The correct answer is: 256 bits

The Twofish encryption algorithm supports a maximum key length of 256 bits. This feature allows it to provide a high level of security, accommodating various security requirements while maintaining efficiency. The use of longer keys in Twofish enhances the algorithm's resilience against brute-force attacks, where an attacker attempts to guess the key by trying every possible combination. With 256 bits as the maximum key length, Twofish provides strong protection against unauthorized access to encrypted data. In contrast, the other options—128 bits and 192 bits—represent the minimum and intermediate key lengths supported by Twofish. Though these lengths still offer a decent level of security, they do not provide the same degree of protection as the maximum 256-bit key length. The choice of 512 bits is not applicable because Twofish specifically limits key sizes to a maximum of 256 bits.