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Systems, devices, and methods for outputting alerts to indicate the use of a weak hash function

  • US 9,015,486 B2
  • Filed: 09/10/2012
  • Issued: 04/21/2015
  • Est. Priority Date: 09/28/2007
  • Status: Active Grant
First Claim
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1. A method of outputting an alert on a mobile device, the method comprising:

  • receiving data that identifies both at least one first hash function and at least one application, wherein each of the at least one first hash function identified in the data is identified as being weak;

    identifying a public key associated with a first certificate of a plurality of certificates belonging to a certificate chain;

    repeating, for each of the plurality of certificates belonging to the certificate chain,identifying a second hash function used to digitally sign the certificate; and

    determining whether the second hash function used to digitally sign the certificate is weak, based on the data,wherein the second hash function used to digitally sign the certificate is determined to be weak if;

    the second hash function used to digitally sign the certificate matches any of the at least one first hash function identified in the data, andthe determining is being performed for an application identified in the data; and

    outputting the alert when, for at least one certificate of the plurality of certificates belonging to the certificate chain, the second hash function used to digitally sign the at least one certificate is determined to be weak.

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