: The string of numbers and letters starting with 87D25... is a unique GUID (Globally Unique Identifier) that Windows uses to identify the specific manufacturer and type of smart card being used.
To understand the utility of the string, we must first deconstruct it. The keyword is composed of two distinct parts, separated by a space, which hints at a key-value pair or a command-parameter structure commonly found in logs and configuration files. scfilter cid-87d25e32-ac0d-4ef0-b1e0-502c6b7dfb77
The second segment is far more specific. The prefix typically stands for Correlation ID , Client ID , or Content ID . This is followed by a standard UUID (Universally Unique Identifier). : The string of numbers and letters starting with 87D25
If you see this identifier and it is causing warnings, errors, or performance issues, follow these steps: The keyword is composed of two distinct parts,
Smart Card Plug and Play - Windows drivers | Microsoft Learn
How it works. A smart card filter driver (scfilter) precedes the smart card reader driver and detects smart card insertion events. Microsoft Learn