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Lexmark CS728

Lexmark CS728

What Types of Certificate Algorithms Do Lexmark Printers Support?


A " Signature algorithm not supported" error message implies that the certificate type used in the printer is not supported.

Certificate algorithms:

Because of the recently found vulnerabilities on SHA1 certificates, users are now moving to SHA2 certificates.


has four kinds of hash functions:

  • SHA224

  • SHA256

  • SHA384

  • SHA512

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

2012 Products

MS31x, MS41x, MS51x, MS61x, MS71x, MS81x, MS91x, MX31x, MX41x, MX51x, MX61x, MX71x, MX81x, MX91x, CS31x, CS41x, CS51x, CX31x, CX41x, CX51x

2016 Products

CS720, CS725, CS820, C6160, CX725, CX820, CX825, CX860, XC6152, XC8155, XC8160


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.


Fees may apply for a SPR.

Still Need Help?

Have the following available when calling Lexmark Technical Support;

  • Printer model(s)

  • Printer serial number

  • Software / Solution


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