A "Signature algorithm not supported" error message implies that the certificate type used in the printer is not supported.
Because of the recently found vulnerabilities on SHA1 certificates, users are now moving to SHA2 certificates
SHA2 has four kinds of hash functions:
Although Lexmark printers support the SHA2 certificate, not all of them support all hash functions, especially SHA384 and SHA512.
Printer models that support SHA384 and SHA512
Here are the list of printers that support SHA384 and SHA512:
|Product announced year||Printer models|
MS31x, MS41x, MS51x, MS61x, MS71x, MS81x, MS91x, MX31x, MX41x, MX51x, MX61x, MX71x, MX81x, MX91x, CS31x, CS41x, CS51x, CX31x, CX41x, CX51x
CS720, CS725, CS820, C6160, CX725, CX820, CX825, CX860, XC6152, XC8155, XC8160
IMPORTANT! For users who have older printer models and want to use the SHA384 and SHA512 hash functions, a Special Product Request (SPR) process is necessary to proceed. Please contact Lexmark Technical Support for assessment and more information. NOTE: Fees may apply for a SPR.
If you need additional assistance, please go to the Lexmark support site, type your printer model and locate Get in Touch with Lexmark! for contact information. NOTE: When calling for support, you will need the following:
- Name and version of the solution
- Affected printer model/s
- Printer serial number
Please be near the product/s described in this article to expedite the support process and reduce callbacks.