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In Linux and Unix, the kernel identifies users by their user id. User ids are integers. User ids are mapped to user names in user mode programs.
Root users have user id 0.
Many other operating systems also use user ids. In those other systems, user ids may also be strings.
Reduce Secure Shell risk. Get to know the NIST 7966.
The NISTIR 7966 guideline from the Computer Security Division of NIST is a direct call to action for organizations regardless of industry and is a mandate for the US Federal government.
ISACA Practitioner Guide for SSH
With contributions from practitioners, specialists and SSH.COM experts, the ISACA “SSH: Practitioner Considerations” guide is vital best practice from the compliance and audit community.