"Is a current state-of-the-art encrypted transmission likely to be crackable in the next 5, 10 years? - probably not. But estimating that 15-20 years down the line is a fool's errand, let alone 75 years!"
So the NSA, the largest employer of mathematicians in the world and well known for building flaws into all past encryption methods, tells you to use these four algorithms and you think anything encrypted with them is safe for 5+ years.
(Best Dr. Evil) Riiiiiiiiiiiiiight...