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DNSSEC from first principles: DS, DNSKEY, RRSIG and the chain of trust

An original source-backed IROSG IT guide.

DNSSEC from first principles: DS, DNSKEY, RRSIG and the chain of trust

Scope

This original IROSG guide covers اعتبارسنجی DNS با DNSSEC using the cited primary documentation.

Core model

DNSSEC recordهای DNS را با امضای دیجیتال قابل اعتبارسنجی می‌کند. DNSKEY کلید zone را معرفی می‌کند، RRSIG امضای RRset است و DS در parent پیوند اعتماد را به child zone ایجاد می‌کند.

Practical workflow

dig +dnssec و resolver validating را برای مشاهدهٔ AD flag، DNSKEY، DS و RRSIG استفاده کنید. rollover کلید باید با TTL و propagation هماهنگ باشد.

Failure modes

DNSSEC confidentiality نمی‌دهد؛ query هنوز قابل مشاهده است مگر DoT/DoH یا مسیر امن دیگری استفاده شود. DS اشتباه در parent می‌تواند zone سالم را برای validating resolver کاملاً bogus کند.

Lab

یک zone آزمایشی sign کنید، validation را فعال کنید و سپس DS یا signature را عمداً خراب کنید. تفاوت SERVFAIL validating resolver با resolver بدون validation را ببینید.

Production method

Capture a baseline, change one variable at a time, test positive and negative paths, keep evidence, and rehearse rollback before broad rollout.

TRACEABLE KNOWLEDGE

Sources & further reading

01
Cloudflare — مرجع فنیhttps://blog.cloudflare.com/dnssec-an-introduction/

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