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How to check the domain and SSL certificate of a casino
Short (for player in 60 seconds)
1. The address starts with https ://and shows the lock without errors.
2. The domain is written without "substitutions" (zero ↔ o, rn ↔ m). Clicking on the lock → the certificate was issued by trusted CAs on the same domain.
3. There are no "Not secure" or "Mixed content" warnings on any pay/account screen.
4. In footer - legal name and license (same as brand).
If any of this does not converge, do not enter data and close the tab.
Domain check: is this exactly the "that" site?
1) Visual and linguistic substitutions
Look at IDN and similar characters: 'paypal. com '(Cyrillic) vs' paypal. com`.
For suspicious addresses, click on the "Certificate" → lock → look at the canonical domain (punycode).
2) WHOIS and DNS features
It is normal when the brand has an understandable registrar, privacy is hidden, the domain is not active "yesterday."
Base records: 'A/AAAA', 'NS', 'MX', CAA (which CAs are allowed). The presence of CAA is a plus to the discipline.
3) Brand and legal entity
T&C and footer must have a legal name and license number. It usually appears in the OV/EV certificate.
Certificate verification: what is important to see
1) Validity and trust chain
The certificate is not expired, the chain to the root CA is "green."
Check SAN (Subject Alternative Name): your domain must be inside.
2) Type and owner
DV (domain) - ok for public sites without payment forms.
OV/EV - preferable for a casino: a legal entity will be indicated in the "Subject" (must coincide with the brand/license).
3) Recall and transparency
OCSP stapling: "Good" status.
CT logs (Certificate Transparency): certificate published; no "extra" issues per brand is a good sign.
Transport Security: TLS and Headlines
1) Protocol versions and ciphers
TLS 1 enabled. 2/1. 3, SSLv3/TLS1 are disabled. 0/1. 1.
Ciphers with PFS: ECDHE + AES-GCM or ChaCha20-Poly1305.
2) HSTS and "full HTTPS"
HSTS header with'includeSubDomains; preload '(after eliminating mixed content).
HTTP → HTTPS redirect on all pages (including images and scripts).
3) Critical security-headers
CSP (with 'default-src' self 'and correct sources),' X-Content-Type-Options: nosniff ',' Referrer-Policy ',' frame-ancestors' (or 'X-Frame-Options') to protect against clickjacking, Cookie: 'Secure; HttpOnly; SameSite=Lax/Strict`.
Quick online checks (no code)
SSL/TLS profile: Qualys SSL Labs Server Test - TLS version, ciphers, chain, HSTS, trust.
HTTP заголовки: SecurityHeaders / Observatory — CSP, HSTS, XFO, Referrer-Policy.
CT monitoring: crt. sh/Censys - what certificates were issued for the domain/brand.
DNS/CAA: dig/online DNS inspectors.
Command Line Mini Tools
key> Replace'example. casino 'to the domain being scanned.
View certificate and chain
bash openssl s_client -connect example. casino:443 -servername example. casino -showcerts </dev/null 2>/dev/null openssl x509 -noout -issuer -subject -dates -ext subjectAltNameCheck the TLS version and cipher (example with TLS1. 2)
bash openssl s_client -connect example. casino:443 -tls1_2 -cipher 'ECDHE' </dev/null grep -E 'Protocol Cipher'Check security headers
bash curl -sI https://example. casino grep -Ei 'strict-transport-security content-security-policy x-content-type-options referrer-policy x-frame-options set-cookie'Check HTTP → HTTPS redirect
bash curl -I http://example. casinoCheck CAA (who can issue certificates)
bash dig +short CAA example. casinoMixed content: how to notice and why it is dangerous
If a page over HTTPS downloads pictures/JS/CSS by http ://, the browser swears: some of the content can be replaced. For payment/personal pages, mixed content is a critical error. The solution is strict CSP, absolute HTTPS links, assembly verification.
Email authentication (anti-phishing)
The presence of SPF, DKIM, DMARC for the casino domain reduces the risk of phishing emails "from support." Check:bash dig +short TXT example. casino # SPF/DMARCDMARC must be at least'p = quarantine ', better'p = reject'.
What else distinguishes the official casino domain
Single subdomain structure (e.g. 'www', 'help', 'payments'), no random hosts.
Statics/media subdomains also with valid TLS and correct chain.
On the pages of the CUS/wallet - always https ://, without warnings.
T&C specifies an ADR/regulator that matches the domain brand.
Checklist for the player
The address is exactly your casino (without extra dashes/letters), https ://, lock without errors.
There are no warnings and "yellow" icons on the replenishment/output page and in the profile.
In "Certificate" - your domain in the SAN, the certificate is valid "from... by...."
Any doubts - go only from bookmarks or manually type the address; do not click links from emails/instant messengers.
Operator checklist (short but hard)
TLS 1. 2/1. 3, ECDHE+AES-GCM/ChaCha; SSLv3/TLS1. 0/1. 1 are off.
HSTS preload after elimination of mixed content; redirect HTTP→HTTPS everywhere.
OV/EV to public domains; mTLS for internal APIs and webhooks.
CT brand monitoring; CAA limits permitted CAs.
CSP strict, cookie 'Secure; HttpOnly; SameSite`.
Auto renewal, alerts for 30/14/7/1 days; TLS tests after each release.
SPF/DKIM/DMARC'p = reject'on the primary distribution domain.
Admin panel - on a separate domain/segment, IP-allow-list + 2FA.
Frequent traps and how to avoid them
Homographic domains ('xn--...'): always see punycode in certificate properties.
Fake "lock" in the UI of the site: focus only on the browser lock.
EV for show: does not compensate for poor TLS and mixed content configuration.
TLS on CDN only: Enable TLS behind CDN before origin.
Expired certificates: Automate release/renewal (ACME) and monitoring.
Checking the domain and SSL/TLS is not "magic," but a set of simple steps. For the player, it is enough to make sure of the correct domain and valid certificate without warning. For operators, discipline is important: modern TLS profile, HSTS, strict headers, CT monitoring, CAA and no mixed content. This protects payments and KYC data, increases trust and directly affects conversion and license compliance.