Quantum Computing.
applied to scanning the 2¹²⁸ key space of AES128 the Grover’s algorithm reduce the number of steps from 2¹²⁸ to 2⁵⁶, This is an enormous reduction. A brute force classical computing cracking of a similar encryption with a 2⁵⁶ key space was accomplished in 22 hours and 15 minutes back in 1999. This