Configure minimum RSA public key size

This policy setting allows you to configure the minimum number of RSA public key bits Office allows to create digital signatures.

If you enable this policy setting, you can specify the minimum number of bits that can be used to create a digital signature. For example: 1024, 2048, etc.

If you disable or don't configure this policy setting, Office allows all RSA keys, unless the legacy or invalid RSA policy settings are configured.

If the legacy or invalid RSA public key bits policy settings are configured, then the default for this setting will be the next larger value. For example, if the number of RSA public key bits is set to 768, then this setting would default to 1024.

Supported on: At least Windows 7



  1. 0
    Registry HiveHKEY_CURRENT_USER
    Registry Pathsoftware\policies\microsoft\office\16.0\common\signatures
    Value Nameminsigningrsabits
    Value TypeREG_DWORD
    Value0
  2. 512
    Registry HiveHKEY_CURRENT_USER
    Registry Pathsoftware\policies\microsoft\office\16.0\common\signatures
    Value Nameminsigningrsabits
    Value TypeREG_DWORD
    Value512
  3. 768
    Registry HiveHKEY_CURRENT_USER
    Registry Pathsoftware\policies\microsoft\office\16.0\common\signatures
    Value Nameminsigningrsabits
    Value TypeREG_DWORD
    Value768
  4. 1024
    Registry HiveHKEY_CURRENT_USER
    Registry Pathsoftware\policies\microsoft\office\16.0\common\signatures
    Value Nameminsigningrsabits
    Value TypeREG_DWORD
    Value1024
  5. 1536
    Registry HiveHKEY_CURRENT_USER
    Registry Pathsoftware\policies\microsoft\office\16.0\common\signatures
    Value Nameminsigningrsabits
    Value TypeREG_DWORD
    Value1536
  6. 2048
    Registry HiveHKEY_CURRENT_USER
    Registry Pathsoftware\policies\microsoft\office\16.0\common\signatures
    Value Nameminsigningrsabits
    Value TypeREG_DWORD
    Value2048
  7. 4096
    Registry HiveHKEY_CURRENT_USER
    Registry Pathsoftware\policies\microsoft\office\16.0\common\signatures
    Value Nameminsigningrsabits
    Value TypeREG_DWORD
    Value4096


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