Ask your self why we are only at 256bit encryption? What are the processing speeds of today’s computers.
It doesn't matter HOW fast the latest computers are. It STILL takes too long to break into a 256 bit AES encryption when there is only ONE key that will unlock it. Even if we take the FASTEST computer we have to day, and multiply its speed by ONE BILLION, it makes very little difference in how long it will take to decrypt an AES encryption by brute force. Since it would now take 5.26 Billion vigintillion (10195) Years to break into your data using the fastest super computer we currently have available, multiplying that computers' speed by 1,000,000,000, means it would only take 5.26 X 10185 Years to break into your data. Yeah, it's a shorter time, a billion times shorter, but it doesn't make much difference to us getting at that data.
Say we make that computer a trillion times faster. . . then it would only take us 5.62 X 10181 years. Whoopee! I might have time to finish my coffee. . .
Here's that first number of years written out. . .
5,260,096,410,168,500,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000.000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000 YEARS