The Security Identifier (SID) is used to uniquely identify trustees (users, groups, services, etc). Use whoami /user to see the current user’s SID
SIDs have the following format:
"S-" R "-" I "-" S
e.g. S-1-5-21-2536614405-3629634762-1218571035-1116
where:
- S: a literal character
- R: revision level (usually 1)
- I: identifier-authority (usually 5 for built-in entities and Active Directory)
- S: one or more subauthority values
- domain’s numeric identifier, e.g.
21-2536614405-3629634762-1218571035 - RID / relative identifier, e.g.
1116
- domain’s numeric identifier, e.g.