Updating RSA Digital Certificates – 1024 bits not supported

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This is the originality and authenticity of the email;

  • Outlook does not connect to the Exchange server with RSA certificates less than 1024 bits. Users see a warning that the certificate is unreliable and therefore blocked;
  • When installing products with weak RSA certificates, users receive a certificate warning that prevents them from installing the unreliable product;
  • According to Advisory, HP-UX PA-RISC System Center computers that use an RSA certificate with a 512-bit key length will generate heartbeat alerts and all computer monitoring operations will fail. An SSL certificate error is also generated with the signed certificate verification description. Click here for more information on HP UX PA RISC computers with 512-bit key length.


The Microsoft TechNet team discusses detailed FAQs and action suggestions in its blog.

The SO section 2661254 has proposed the following method to verify if you have weak digital RSA certificates.

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All digital RSA certificates can be opened by double-clicking on the icon. Certification details can be found in the Details tab once you open the digital certificate. There should be a field called Public Key that displays the number of bits used by the certificate.

Other methods are listed in KB Section 2661254. I also recommend the CAPI2 method. It will help you identify all certificates with weak encryption strength. The method is described in KB Section 2661254 linked above.

Although IT administrators are strongly encouraged to update their RSA digital certificates with a minimum of 1024 bits, Microsoft offers a workaround to access websites and programs with low digital certificates. He says that it can take some time for all administrators to update their certificates, so users can use the workaround necessary to access weak digital RSA certificates, even when websites and programs renew and update their certificates. The solution is to modify the Windows registry. To optimize the Windows registry with the certutil command, see the section Key length under 1024 bits with registry parameters under RESOLUTIONS in the related KB article.

Note that there are two sections: one called RESOLUTIONS (plural) and the other called RESOLUTIONS. You must refer to the RESOLUTIONS section for the workaround solution to temporarily enable weak RSA digital certificates.

Microsoft provides updates in the RESOLUTION section of KB 2661254. These patches update your system to increase the minimum encryption levels in Windows operating systems so that you do not have problems accessing strong digital RSA certificates. Check the operating system mentioned for patches (including 32 or 64 bits) before downloading them to make sure you are downloading the correct update.

In summary, the era of 512-bit RSA digital certificates is over. You need to move to stronger key forces to better protect yourself against data exploitation.

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