gen-explain-key-length-and-brute-force-resistance-as-you-would-t-0b6c

Explain key length and brute-force resistance as you would to a capable student, in 3-4 sentences.

# Key Length and Brute-Force Resistance Key length refers to the number of bits in an encryption key, which determines how many possible keys exist—for example, a 128-bit key has 2^128 possible combinations. Brute-force resistance measures how difficult it is for an attacker to try every possible key until finding the right one. Longer keys exponentially increase the number of attempts needed: a 256-bit key requires 2^128 times more guesses than a 128-bit key, making it astronomically harder to crack. Modern encryption typically uses at least 128-bit keys because even the world's fastest computers would take billions of years to brute-force them.