: Refers directly to the Smart Card Filter Driver subsystem operating within kernel space ( %WinDir%\System32\DRIVERS\scfilter.sys ).
Not necessarily. Most of the time, this is just an internal tracking ID. However, if you see it in an unexpected place (e.g., a suspicious email or a URL you don’t recognize), it could indicate:
The CID (Card Identifier) string is a unique hexadecimal value that identifies the specific model or manufacturer of a smart card, such as those from Yubico or Feitian. scfilter cid87d25e32ac0d4ef0b1e0502c6b7dfb77
While the exact workings of cid87d25e32ac0d4ef0b1e0502c6b7dfb77 are not publicly disclosed, it's likely that this filter uses a combination of technologies to identify and block unwanted content. Some possible methods include:
Below is a technical deep paper exploring the architecture, discovery process, and practical implications of this identifier. : Refers directly to the Smart Card Filter
is an official Microsoft Windows kernel‑mode driver whose full name is the Smart card PnP Class Filter Driver (service name: scfilter ). Its job is to bridge the gap between a physical smart card reader and the operating system’s higher‑level smart card services.
Double-click it, change its status to , and click Apply. However, if you see it in an unexpected place (e
The Microsoft Update Catalog also contains numerous entries for CIDs, such as scfilter\cid_804f0ca00000030603000100000000 , confirming that these identifiers are part of Microsoft’s official driver‑matching mechanism for smart cards.
Exploring the World of Digital Filters
SCFILTER\CID_XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX