Why does "2xAES-256" provide "99.99%" security strength whereas "1xAES-128" provides "40%"? I recently was "directed" to FlipsCloud, a company selling security solutions (as far as I can tell).

In particular I've investigated their page and found a page on their "encryption features".

This page claims a few things (some of which deserve their own questions).

As for this question, I'm asking:

How can one construct the "security strengths" given on the page?

For everyone not wanting to visit this page, he's the chart in question in text form:


  Security Strength of Encryption Technologies
  2x AES-256 bit(CBC) 99.99%
  1x AES-256 bit(CBC) 50%
  AES-128 bit 40%
  RC4-128 bit 30%
  RC4-40 bit 10%
It's meaningless nonsense. I would be inclined to avoid spending any money with these people. If you scroll down on this page, you'll find a table labelled key size vs. time to crack, according to which their $2 \times 256$ bit encryption takes $3.31 \times 10^{112}$ years to crack, making it (apparently) superior to ordinary $256$-bit encryption (which can be cracked after a paltry $3.31 \times 10^{56}$ years).

I think you'll find that the values you cited are based on the exponents of these numbers (hence $10^{112} \rightarrow 100\%$, but $10^{56} \rightarrow 50\%$).

However, they don't explain why you should be concerned about your data remaining secure after the heat death of the universe.

Seriously, don't give your money to these clowns.