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A WWW Based Computing Project Undertaken at NPAC - RSA Factoring
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In the early eighties some people thought that 100-digit numbers would offer enough security; 100-digit numbers can now routinely be factored.
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In the August 1977 issue of Scientific American the inventors of posed the129-digit RSA challenge, and predicted that it would take 40 quadrillion years to factor the challenge; it was factored in April 1994 after 8 months on the Internet.
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Right now many people are still protecting their data and money using 155- digit (i.e., 512-bit) numbers.
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