The security firm Keyfactor recently presented information proving that about 250,000 RSA keys are vulnerable to compromise.
The report was based on the examination of 175 million RSA certificates and keys. Researchers mined active and publicly available RSA keys to identity any common factors. Keyfactor said Any keys sharing one of their prime factors with another key are compromised by this technique.
In the end 435,000 certificates were found to have a shared factor from which researchers were able to rederive the private key.
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