Side-Channel Leak Bits

Problem

Model a side channel that leaks the given fraction of a secret's bits: return total_bits * leaked_fraction, the number of bits exposed to the attacker.

Hint

Leaking the whole key leaves zero effective security.

Test cases

case 1

in: [128,0.25]

expected: 32

case 2

in: [256,0.5]

expected: 128

case 3

in: [100,0]

expected: 0

case 4

in: [64,1]

expected: 64

Starter codePython

def leaked_bits(total_bits, leaked_fraction):
    # Your code here
    pass

4 test cases · run your code against them in the editor