Security & TLS · medium · solved in-browser (no VM needed) · 3 tiered hints
Write /etc/pam.d/system-auth-local, a PAM password-stack fragment that invokes pam_pwquality.so in the password phase, requesting 3 retries (retry=3) and enforcing the policy even for root (enforce_for_root). The line must begin with the 'password' type and a 'requisite' control. (Authored config, graded structurally — the engine isn't run here.)
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Certificates, signatures, hardening sshd and verifying trust.
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