When implementing keys for authentication, if an old key length with 4 bits is increased to 8 bits, which statement describes the new key space?

When implementing keys for authentication, if an old key length with 4 bits is increased to 8 bits, which statement describes the new key space?

• The key space is increased by 3 times.
• The key space is increased by 8 times.
• The key space is increased by 15 times.
• The key space is increased by 16 times.

Explanation: A key length with 4 bits will provide a key space of 2^4=16 keys. The new key length with 8 bits can provide a key space of 2^8=256 keys. The key space with 256 keys is 15 times larger than a key space with 16 keys.

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