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Why are 1024 bit keys the limit right now?

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NODE 12297081Why are 1024 bit keys the limit right now? AaronH4321@aol.comTue, 7 Jan 1997 23:18:51 -0800 (PST)

I am just starting at this. I know that part of RSA/PGP's strength comes from
the size key you choose. What prevents someone from writting a 2048 bit key?
Is it because computers can't handle it? Is 1024 top of  the prime number
size right now? Am I way off track?