Where to securely enter data and payments - SSL, encryption

1) Basic site security minimum

TLS only 1. 2/1. 3 (no 1. 0/1. 1).
Modern ciphers: ECDHE with AES-GCM or ChaCha20-Poly1305 (pen. on mobile).
PFS (Perfect Forward Secrecy) — через ECDHE.
Valid certificate (SHA-256), RSA key ≥2048 or ECDSA P-256/384.
HSTS (+ preferably preloaded): hard enforcement of HTTPS.
Redirect from HTTP to HTTPS without exceptions.
Certificate Transparency (SCT) - visible in the certificate details.

2) How to verify a certificate in 30-60 seconds

1. Click on the "lock" → Certificate:

• Issued to = exact domain/subdomain (SAN).
• Issued by - recognizable CA.
• The deadline is not expired/not "tomorrow."
2. В DevTools → Security:
• TLS 1. 2/1. 3, ECDHE и AES-GCM/ChaCha20.
• No "mixed content" (HTTP pictures/scripts on HTTPS page).
• 3. Open the payment page: the form domain matches the site or it is a well-known PSP in the iframe.

3) Protected payments: what is considered the norm

PCI DSS: the site does not collect PAN/CVV itself - card fields inside the hosted fields/iframe PSP or redirect to the provider's payment page.
Tokenization: card turns into token; the site only stores "last4" and a token, never CVV.
3-D Secure 2. x/SCA: push confirmation/biometrics at the bank.
Apple Pay/Google Pay: network tokens, minimal manual input.
Bank account methods (PayID/Osko, etc.): accurate details and confirmation of crediting are shown; there are no requests to "send a card screen to the chat."
Crypto payments: address/QR is generated on the PSP page, the amount/network is registered, there is a warning about the network and commissions.

4) Sessions and login

Passkeys/ FIDO2 or 2FA (TOTP/app, FIDO key; SMS is a fallback).
Куки: `Secure`, `HttpOnly`, `SameSite=Lax/Strict`; auto-logout by timeout.
Device management: list of active sessions, exit "from all devices."
Password login/change alerts by e-mail/push.

5) Front-end and backend protection (indirect markers)

CSP (Content-Security-Policy), X-Content-Type-Options, Referrer-Policy, frame-ancestors (anti-clickjacking).
Without third-party "left" scripts on the payment page (anti-skimmer/Magecart).
Restriction/masking data: only "last4" and disguised e-mail/phone are displayed in the profile.

6) CCM/Documents - How to Load Safely

Only through a secure cabinet (HTTPS/TLS 1. 2 +) with loader; do not send documents to chat/mail.
Supported formats (PDF/JPG/PNG), size limit, explicit retention/deletion policy.
Watermarks ("KYC only\[ site ]\[ date]"), hidden card numbers/QR.
Privacy policy: shelf life, transfer to third parties (KYC provider), country of storage.

7) Mobile and apps

Without ARC/extensions: play in the browser (HTML5) or official stores (App Store/Google Play).
Application rights are minimal; no "SMS/contacts/calls."
Public Wi-Fi - only with VPN and without entering a CUS/card.
OS/Browser auto-updates are enabled.

8) Quick site audit (15 minutes)

1. License/registry (2 minutes): on the site - number and click, the legal entity/domain match in the registry.
2. TLS/certificate (2 min): lock → certificate (SAN, term, CA); DevTools → TLS 1. 2/1. 3, ECDHE+AES-GCM/ChaCha20.
3. HSTS/redirects (1 min): forced HTTPS, no HTTP versions of personal account/cash register.
4. Payment form (4 minutes): hosted fields/iframe PSP, no 'name = "cardnumber"' in the site code; 3-D Secure 2. x; tokenization; methods and SLA payouts published.
5. Account (3 min): turn on 2FA/Passkeys; check the logs of inputs/devices; 'HttpOnly/Secure'cookies.
6. KYC (3 min): cabinet bootloader, Privacy policy, ban on sending by e-mail.

9) Safety matrix (100 points)

TLS/Certificate - 20 (TLS 1. 2/1. 3, ECDHE+AES-GCM/ChaCha20, CT, HSTS)
Payments/PCI - 25 (PSP-iframe/redirect, tokenization, 3-DS 2. x, no PAN/CVV storage)
Sessions/2FA - 15 (Passkeys/TOTP, secure cookies, device management)
Front protection - 10 (CSP, referrer-policy, frame-ancestors, no third-party scripts at the checkout)
KYC/Privacy - 10 (cabinet upload, storage time, e-mail prohibition)
License/registry - 10 (click in the registry, match legal entity/domain)
Mobile - 5 (no ARC/extensions, official. stori)
Transparency of payments - 5 (methods, min/max, commissions, SLA, same-method)
Interpretation: ≥85 is a strong recommendation; 75-84 - fit; 60-74 - average; <60 - avoid.

10) Red flags (past immediately)

No HTTPS on login/payment pages, mixed content.
TLS 1. 0/1. 1, outdated ciphers, self-signed/expired certificate.
Card fields in the DOM of the site (and not in the iframe PSP); requests to send a photo card/KUS to chat/mail.
No 3-D Secure 2, no tokenization; saving PAN/CVV to account.
No 2FA/Passkeys; cookies without 'HttpOnly/Secure'.
Require ACA/enhancements for game/payment.
Privacy policy without data retention/transfer.

11) Verification card template (fill in one site)

Domain/license/registry link:
• TLS/Certificate: Version/Cipher/CA/Term/HSTS/CT
• Payments: PSP-iframe/redirect/ 3-DS 2/tokenization/methods and SLA/same-method
• Account: 2FA/Passkeys/secure cookies/session management
• KYC/Privacy: cabinet upload/shelf life/prohibition e-mail
• Front defense: CSP/frame-ancestors/referrer-policy
• Mobile: office. stores/no ARA/extensions
Final score (0-100):
• 12) FAQ (short)

Lock = safe? No, it isn't. See the TLS version, cipher, certificate, HSTS and how the payment form is built in.
Can I enter a map on the site itself? Safer - via iframe/redirect PSP. If the site handles PAN itself, it must comply with PCI DSS (rare).
SMS-2FA norms? Better TOTP/FIDO; SMS is a fallback.
KYC documents to chat? No, it isn't. Only through the cabinet bootloader on HTTPS.

Result

Secure input of data and payments is not a "lock in the address bar," but a set of signs: modern TLS, HSTS, a certificate without surprises, payment forms from PSP with tokenization and 3-D Secure 2, 2FA/Passkeys, secure sessions and cabinet KYC apload. Take a 15-minute audit, rate the site on a 100-point matrix and cut off projects with red flags - this way you minimize the risk of interception and data leakage when playing for money.