[tptacek]

160,000 EC2 instances running for years won't make a dent in a 2048 RSA key.

[drakaal]

If you have a large enough table of primes and factors RSA 2048 is only about 5% harder to crack than a 1024.

If you don't have one it is billions of times harder. How large is your Prime table? How large is mine? How large is the NSA's?

[tptacek]

No.