SSL Report: codimd.trask.cz (80.188.191.83)
Assessed on:  Tue, 16 Sep 2025 10:50:32 UTC | Clear cache
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Summary
Overall Rating
A-
0
20
40
60
80
100
Certificate
 
Protocol Support
 
Key Exchange
 
Cipher Strength
 

Visit our documentation page for more information, configuration guides, and books. Known issues are documented here.
Server sent invalid/disabled HSTS policy. See below for further information.  MORE INFO »
This server supports TLS 1.3.  MORE INFO »
Certificate #1: RSA 2048 bits (SHA256withRSA)
Server Key and Certificate #1
Subject *.trask.cz
Fingerprint SHA256: e5eb7634a9ba10a3fa0c0d9a6f6df6f068215a501ea7b08ecb5775aef37a096c
Pin SHA256: Eat45+PwLIo+WlgIB7urM6de9SbwAUV8keXPPSVPaPo=
Common names *.trask.cz
Alternative names *.trask.cz trask.cz www.trask.cz
Serial Number 0bb5fe2eebb2ee60d9951f50cf70e395
Valid from Tue, 03 Jun 2025 00:00:00 UTC
Valid until Mon, 15 Jun 2026 23:59:59 UTC (expires in 8 months and 30 days)
Key RSA 2048 bits (e 65537)
Weak key (Debian) No
Issuer Thawte TLS RSA CA G1
AIA: http://cacerts.thawte.com/ThawteTLSRSACAG1.crt
Signature algorithm SHA256withRSA
Extended Validation No
Certificate Transparency Yes (certificate)
OCSP Must Staple No
Revocation information CRL, OCSP
CRL: http://cdp.thawte.com/ThawteTLSRSACAG1.crl
OCSP: http://status.thawte.com
Revocation status Good (not revoked)
DNS CAA No (more info)
Trusted Yes
Mozilla  Apple  Android  Java  Windows 


Additional Certificates (if supplied)
Certificates provided 2 (2799 bytes)
Chain issues None
#2
Subject Thawte TLS RSA CA G1
Fingerprint SHA256: 4bcc5e234fe81ede4eaf883aa19c31335b0b26e85e066b9945e4cb6153eb20c2
Pin SHA256: 42b9RNOnyb3tlC0KYtNPA3KKpJluskyU6aG+CipUmaM=
Valid until Tue, 02 Nov 2027 12:24:25 UTC (expires in 2 years and 1 month)
Key RSA 2048 bits (e 65537)
Issuer DigiCert Global Root G2
Signature algorithm SHA256withRSA


Certification Paths
Path #1: Trusted
1 Sent by server *.trask.cz
Fingerprint SHA256: e5eb7634a9ba10a3fa0c0d9a6f6df6f068215a501ea7b08ecb5775aef37a096c
Pin SHA256: Eat45+PwLIo+WlgIB7urM6de9SbwAUV8keXPPSVPaPo=
RSA 2048 bits (e 65537) / SHA256withRSA
2 Sent by server Thawte TLS RSA CA G1
Fingerprint SHA256: 4bcc5e234fe81ede4eaf883aa19c31335b0b26e85e066b9945e4cb6153eb20c2
Pin SHA256: 42b9RNOnyb3tlC0KYtNPA3KKpJluskyU6aG+CipUmaM=
RSA 2048 bits (e 65537) / SHA256withRSA
3 In trust store DigiCert Global Root G2   Self-signed
Fingerprint SHA256: cb3ccbb76031e5e0138f8dd39a23f9de47ffc35e43c1144cea27d46a5ab1cb5f
Pin SHA256: i7WTqTvh0OioIruIfFR4kMPnBqrS2rdiVPl/s2uC/CY=
RSA 2048 bits (e 65537) / SHA256withRSA
Path #1: Trusted
1 Sent by server *.trask.cz
Fingerprint SHA256: e5eb7634a9ba10a3fa0c0d9a6f6df6f068215a501ea7b08ecb5775aef37a096c
Pin SHA256: Eat45+PwLIo+WlgIB7urM6de9SbwAUV8keXPPSVPaPo=
RSA 2048 bits (e 65537) / SHA256withRSA
2 Sent by server Thawte TLS RSA CA G1
Fingerprint SHA256: 4bcc5e234fe81ede4eaf883aa19c31335b0b26e85e066b9945e4cb6153eb20c2
Pin SHA256: 42b9RNOnyb3tlC0KYtNPA3KKpJluskyU6aG+CipUmaM=
RSA 2048 bits (e 65537) / SHA256withRSA
3 In trust store DigiCert Global Root G2   Self-signed
Fingerprint SHA256: cb3ccbb76031e5e0138f8dd39a23f9de47ffc35e43c1144cea27d46a5ab1cb5f
Pin SHA256: i7WTqTvh0OioIruIfFR4kMPnBqrS2rdiVPl/s2uC/CY=
RSA 2048 bits (e 65537) / SHA256withRSA
Path #1: Trusted
1 Sent by server *.trask.cz
Fingerprint SHA256: e5eb7634a9ba10a3fa0c0d9a6f6df6f068215a501ea7b08ecb5775aef37a096c
Pin SHA256: Eat45+PwLIo+WlgIB7urM6de9SbwAUV8keXPPSVPaPo=
RSA 2048 bits (e 65537) / SHA256withRSA
2 Sent by server Thawte TLS RSA CA G1
Fingerprint SHA256: 4bcc5e234fe81ede4eaf883aa19c31335b0b26e85e066b9945e4cb6153eb20c2
Pin SHA256: 42b9RNOnyb3tlC0KYtNPA3KKpJluskyU6aG+CipUmaM=
RSA 2048 bits (e 65537) / SHA256withRSA
3 In trust store DigiCert Global Root G2   Self-signed
Fingerprint SHA256: cb3ccbb76031e5e0138f8dd39a23f9de47ffc35e43c1144cea27d46a5ab1cb5f
Pin SHA256: i7WTqTvh0OioIruIfFR4kMPnBqrS2rdiVPl/s2uC/CY=
RSA 2048 bits (e 65537) / SHA256withRSA
Path #1: Trusted
1 Sent by server *.trask.cz
Fingerprint SHA256: e5eb7634a9ba10a3fa0c0d9a6f6df6f068215a501ea7b08ecb5775aef37a096c
Pin SHA256: Eat45+PwLIo+WlgIB7urM6de9SbwAUV8keXPPSVPaPo=
RSA 2048 bits (e 65537) / SHA256withRSA
2 Sent by server Thawte TLS RSA CA G1
Fingerprint SHA256: 4bcc5e234fe81ede4eaf883aa19c31335b0b26e85e066b9945e4cb6153eb20c2
Pin SHA256: 42b9RNOnyb3tlC0KYtNPA3KKpJluskyU6aG+CipUmaM=
RSA 2048 bits (e 65537) / SHA256withRSA
3 In trust store DigiCert Global Root G2   Self-signed
Fingerprint SHA256: cb3ccbb76031e5e0138f8dd39a23f9de47ffc35e43c1144cea27d46a5ab1cb5f
Pin SHA256: i7WTqTvh0OioIruIfFR4kMPnBqrS2rdiVPl/s2uC/CY=
RSA 2048 bits (e 65537) / SHA256withRSA
Path #1: Trusted
1 Sent by server *.trask.cz
Fingerprint SHA256: e5eb7634a9ba10a3fa0c0d9a6f6df6f068215a501ea7b08ecb5775aef37a096c
Pin SHA256: Eat45+PwLIo+WlgIB7urM6de9SbwAUV8keXPPSVPaPo=
RSA 2048 bits (e 65537) / SHA256withRSA
2 Sent by server Thawte TLS RSA CA G1
Fingerprint SHA256: 4bcc5e234fe81ede4eaf883aa19c31335b0b26e85e066b9945e4cb6153eb20c2
Pin SHA256: 42b9RNOnyb3tlC0KYtNPA3KKpJluskyU6aG+CipUmaM=
RSA 2048 bits (e 65537) / SHA256withRSA
3 In trust store DigiCert Global Root G2   Self-signed
Fingerprint SHA256: cb3ccbb76031e5e0138f8dd39a23f9de47ffc35e43c1144cea27d46a5ab1cb5f
Pin SHA256: i7WTqTvh0OioIruIfFR4kMPnBqrS2rdiVPl/s2uC/CY=
RSA 2048 bits (e 65537) / SHA256withRSA

Click here to expand

Configuration
Protocols
TLS 1.3 Yes
TLS 1.2 Yes
TLS 1.1 No
TLS 1.0 No
SSL 3 No
SSL 2 No


Cipher Suites
# TLS 1.3 (suites in server-preferred order)
TLS_AES_256_GCM_SHA384 (0x1302)   ECDH x25519 (eq. 3072 bits RSA)   FS 256
TLS_CHACHA20_POLY1305_SHA256 (0x1303)   ECDH x25519 (eq. 3072 bits RSA)   FS 256P
TLS_AES_128_GCM_SHA256 (0x1301)   ECDH x25519 (eq. 3072 bits RSA)   FS 128
# TLS 1.2 (suites in server-preferred order)
TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (0xc02f)   ECDH x25519 (eq. 3072 bits RSA)   FS 128
TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (0xc030)   ECDH x25519 (eq. 3072 bits RSA)   FS 256
(P) This server prefers ChaCha20 suites with clients that don't have AES-NI (e.g., Android devices)


Handshake Simulation
Android 4.4.2 RSA 2048 (SHA256)   TLS 1.2 TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH secp256r1  FS
Android 5.0.0 RSA 2048 (SHA256)   TLS 1.2 TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH secp256r1  FS
Android 6.0 RSA 2048 (SHA256)   TLS 1.2 > http/1.1   TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH secp256r1  FS
Android 7.0 RSA 2048 (SHA256)   TLS 1.2 > h2   TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH x25519  FS
Android 8.0 RSA 2048 (SHA256)   TLS 1.2 > h2   TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH x25519  FS
Android 8.1 -   TLS 1.3 TLS_CHACHA20_POLY1305_SHA256   ECDH x25519  FS
Android 9.0 -   TLS 1.3 TLS_CHACHA20_POLY1305_SHA256   ECDH x25519  FS
BingPreview Jan 2015 RSA 2048 (SHA256)   TLS 1.2 TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH secp256r1  FS
Chrome 49 / XP SP3 RSA 2048 (SHA256)   TLS 1.2 > h2   TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH secp256r1  FS
Chrome 69 / Win 7  R RSA 2048 (SHA256)   TLS 1.2 > h2   TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH x25519  FS
Chrome 70 / Win 10 -   TLS 1.3 TLS_AES_256_GCM_SHA384   ECDH x25519  FS
Chrome 80 / Win 10  R -   TLS 1.3 TLS_AES_256_GCM_SHA384   ECDH x25519  FS
Firefox 31.3.0 ESR / Win 7 RSA 2048 (SHA256)   TLS 1.2 TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH secp256r1  FS
Firefox 47 / Win 7  R RSA 2048 (SHA256)   TLS 1.2 > h2   TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH secp256r1  FS
Firefox 49 / XP SP3 RSA 2048 (SHA256)   TLS 1.2 > h2   TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH secp256r1  FS
Firefox 62 / Win 7  R RSA 2048 (SHA256)   TLS 1.2 > h2   TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH x25519  FS
Firefox 73 / Win 10  R -   TLS 1.3 TLS_AES_256_GCM_SHA384   ECDH x25519  FS
Googlebot Feb 2018 RSA 2048 (SHA256)   TLS 1.2 TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH x25519  FS
IE 11 / Win 7  R Server sent fatal alert: handshake_failure
IE 11 / Win 8.1  R Server sent fatal alert: handshake_failure
IE 11 / Win Phone 8.1  R Server sent fatal alert: handshake_failure
IE 11 / Win Phone 8.1 Update  R Server sent fatal alert: handshake_failure
IE 11 / Win 10  R RSA 2048 (SHA256)   TLS 1.2 > h2   TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH secp256r1  FS
Edge 15 / Win 10  R RSA 2048 (SHA256)   TLS 1.2 > h2   TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH x25519  FS
Edge 16 / Win 10  R RSA 2048 (SHA256)   TLS 1.2 > h2   TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH x25519  FS
Edge 18 / Win 10  R RSA 2048 (SHA256)   TLS 1.2 > h2   TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH x25519  FS
Edge 13 / Win Phone 10  R RSA 2048 (SHA256)   TLS 1.2 > h2   TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH secp256r1  FS
Java 8u161 RSA 2048 (SHA256)   TLS 1.2 TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH secp256r1  FS
Java 11.0.3 -   TLS 1.3 TLS_AES_256_GCM_SHA384   ECDH secp256r1  FS
Java 12.0.1 -   TLS 1.3 TLS_AES_256_GCM_SHA384   ECDH secp256r1  FS
OpenSSL 1.0.1l  R RSA 2048 (SHA256)   TLS 1.2 TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH secp256r1  FS
OpenSSL 1.0.2s  R RSA 2048 (SHA256)   TLS 1.2 TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH secp256r1  FS
OpenSSL 1.1.0k  R RSA 2048 (SHA256)   TLS 1.2 TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH x25519  FS
OpenSSL 1.1.1c  R -   TLS 1.3 TLS_AES_256_GCM_SHA384   ECDH x25519  FS
Safari 6 / iOS 6.0.1 Server sent fatal alert: handshake_failure
Safari 7 / iOS 7.1  R Server sent fatal alert: handshake_failure
Safari 7 / OS X 10.9  R Server sent fatal alert: handshake_failure
Safari 8 / iOS 8.4  R Server sent fatal alert: handshake_failure
Safari 8 / OS X 10.10  R Server sent fatal alert: handshake_failure
Safari 9 / iOS 9  R RSA 2048 (SHA256)   TLS 1.2 > h2   TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH secp256r1  FS
Safari 9 / OS X 10.11  R RSA 2048 (SHA256)   TLS 1.2 > h2   TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH secp256r1  FS
Safari 10 / iOS 10  R RSA 2048 (SHA256)   TLS 1.2 > h2   TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH secp256r1  FS
Safari 10 / OS X 10.12  R RSA 2048 (SHA256)   TLS 1.2 > h2   TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH secp256r1  FS
Safari 12.1.2 / MacOS 10.14.6 Beta  R -   TLS 1.3 TLS_CHACHA20_POLY1305_SHA256   ECDH x25519  FS
Safari 12.1.1 / iOS 12.3.1  R -   TLS 1.3 TLS_CHACHA20_POLY1305_SHA256   ECDH x25519  FS
Apple ATS 9 / iOS 9  R RSA 2048 (SHA256)   TLS 1.2 > h2   TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH secp256r1  FS
Yahoo Slurp Jan 2015 RSA 2048 (SHA256)   TLS 1.2 TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH secp256r1  FS
YandexBot Jan 2015 RSA 2048 (SHA256)   TLS 1.2 TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH secp256r1  FS
# Not simulated clients (Protocol mismatch)
Android 2.3.7   No SNI 2 Protocol mismatch (not simulated)
Android 4.0.4 Protocol mismatch (not simulated)
Android 4.1.1 Protocol mismatch (not simulated)
Android 4.2.2 Protocol mismatch (not simulated)
Android 4.3 Protocol mismatch (not simulated)
Baidu Jan 2015 Protocol mismatch (not simulated)
IE 6 / XP   No FS 1   No SNI 2 Protocol mismatch (not simulated)
IE 7 / Vista Protocol mismatch (not simulated)
IE 8 / XP   No FS 1   No SNI 2 Protocol mismatch (not simulated)
IE 8-10 / Win 7  R Protocol mismatch (not simulated)
IE 10 / Win Phone 8.0 Protocol mismatch (not simulated)
Java 6u45   No SNI 2 Protocol mismatch (not simulated)
Java 7u25 Protocol mismatch (not simulated)
OpenSSL 0.9.8y Protocol mismatch (not simulated)
Safari 5.1.9 / OS X 10.6.8 Protocol mismatch (not simulated)
Safari 6.0.4 / OS X 10.8.4  R Protocol mismatch (not simulated)

Click here to expand

(1) Clients that do not support Forward Secrecy (FS) are excluded when determining support for it.
(2) No support for virtual SSL hosting (SNI). Connects to the default site if the server uses SNI.
(3) Only first connection attempt simulated. Browsers sometimes retry with a lower protocol version.
(R) Denotes a reference browser or client, with which we expect better effective security.
(All) We use defaults, but some platforms do not use their best protocols and features (e.g., Java 6 & 7, older IE).
(All) Certificate trust is not checked in handshake simulation, we only perform TLS handshake.


Protocol Details
Secure Renegotiation Supported
Secure Client-Initiated Renegotiation No
Insecure Client-Initiated Renegotiation No
BEAST attack Mitigated server-side (more info)  
POODLE (SSLv3) No, SSL 3 not supported (more info)
POODLE (TLS) No (more info)
Zombie POODLE No (more info)  
GOLDENDOODLE No (more info)  
OpenSSL 0-Length No (more info)  
Sleeping POODLE No (more info)  
Downgrade attack prevention Yes, TLS_FALLBACK_SCSV supported (more info)
SSL/TLS compression No
RC4 No
Heartbeat (extension) No
Heartbleed (vulnerability) No (more info)
Ticketbleed (vulnerability) No (more info)
OpenSSL CCS vuln. (CVE-2014-0224) No (more info)
OpenSSL Padding Oracle vuln.
(CVE-2016-2107)		 No (more info)
ROBOT (vulnerability) No (more info)
Forward Secrecy Yes (with most browsers)   ROBUST (more info)
ALPN Yes   h2 http/1.1
NPN No
Session resumption (caching) Yes
Session resumption (tickets) Yes
OCSP stapling No
Strict Transport Security (HSTS) Invalid   Server provided more than one HSTS header
HSTS Preloading Not in: Chrome  Edge  Firefox  IE 
Public Key Pinning (HPKP) No (more info)
Public Key Pinning Report-Only No
Public Key Pinning (Static) No (more info)
Long handshake intolerance No
TLS extension intolerance No
TLS version intolerance No
Incorrect SNI alerts No
Uses common DH primes No, DHE suites not supported
DH public server param (Ys) reuse No, DHE suites not supported
ECDH public server param reuse No
Supported Named Groups x25519, secp256r1, x448, secp521r1, secp384r1 (server preferred order)
SSL 2 handshake compatibility No
0-RTT enabled No


HTTP Requests
1 https://codimd.trask.cz/  (HTTP/1.1 200 OK)
1
server openresty
date Tue, 16 Sep 2025 10:49:30 GMT
content-type text/html; charset=utf-8
content-length 14486
vary Accept-Encoding
x-powered-by Express
strict-transport-security max-age=31536000; includeSubDomains; preload
referrer-policy same-origin
content-security-policy default-src 'none';base-uri 'self';connect-src 'self' wss://codimd.trask.cz;font-src 'self' https://*.disquscdn.com;manifest-src 'self';frame-src 'self' https://player.vimeo.com https://www.slideshare.net/slideshow/embed_code/key/ https://www.youtube.com *;img-src *;script-src https://codimd.trask.cz/build/ https://codimd.trask.cz/js/ https://codimd.trask.cz/config https://gist.github.com/ https://vimeo.com/api/oembed.json https://www.slideshare.net/api/oembed/2 'unsafe-inline' https://disqus.com https://*.disqus.com https://*.disquscdn.com https://www.google-analytics.com 'nonce-26dc48af-48ad-4dfe-9b5c-f74dea0ef9cf' 'sha256-81acLZNZISnyGYZrSuoYhpzwDTTxi7vC1YM4uNxqWaM=';style-src https://codimd.trask.cz/build/ https://codimd.trask.cz/css/ 'unsafe-inline' https://github.githubassets.com https://*.disquscdn.com;object-src * *;form-action 'self';media-src *;upgrade-insecure-requests
hedgedoc-version 1.9.9
etag W/"3896-/DPDthZQOr+JnkLSTx1QrWahFI0"
set-cookie connect.sid=s%3AvuUo0hkU2Uc7KKsJTW6mOsFeYevgbE5P.MWOgKYvsl0ZC9qah757Jnv1RQ870Eq7rZKt0N4IabxA; Path=/; Expires=Tue, 30 Sep 2025 10:49:30 GMT; HttpOnly; Secure; SameSite=Lax
vary Accept-Encoding
expires Tue, 16 Sep 2025 10:49:29 GMT
cache-control no-cache
strict-transport-security max-age=63072000
access-control-allow-origin trask.cz mojeid.cz nic.cz
access-control-allow-methods GET, POST, DELETE, PUT, OPTIONS, HEAD
access-control-allow-credentials true
access-control-allow-headers Origin, DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type, Accept, Pragma, Content-Language
x-content-type-options nosniff
connection close


Miscellaneous
Test date Tue, 16 Sep 2025 10:49:17 UTC
Test duration 75.540 seconds
HTTP status code 200
HTTP server signature openresty
Server hostname -


SSL Report v2.4.1