Open
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just now
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SECURITY SCORE
Certificate Information
Subject
C=CN, ST=北京市, O=智者四海（北京）技术有限公司, CN=*.zhihu.com
Issuer
C=US, O=DigiCert, Inc., CN=GeoTrust G2 TLS CN RSA4096 SHA256 2022 CA1
Valid From
December 11, 2025
Valid Until
December 10, 2026
348 days
Public Key
RSA
2048 bit
Adequate
Signature Algorithm
SHA256-RSA
SHA-256 Fingerprint
ED:2D:87:7E:78:A1:6D:58:F0:2A:D5:92:0C:BF:2E:58:DF:55:CA:07:96:FF:AE:66:56:11:31:D5:82:F4:CD:BD
Alternative Names
Security Configuration
TLS Protocols
TLS 1.0
TLS 1.1
TLS 1.2
Forward Secrecy
Limited
(Check cipher configuration)
Warnings
- • TLS 1.3 is not supported (recommended)
- • TLS 1.1 is deprecated and should be disabled
- • TLS 1.0 is deprecated and should be disabled
HTTP Security Headers
Status
Strict-Transport-Security
Present
max-age=15552000; includeSubDomains
Content-Security-Policy
Basic
default-src; img-src; connect-src; +5 more
default-src * blob:;img-src * data: blob: resource: t.captcha.qq.com *.dun.163yun.com *.dun.163.com *.126.net *.nosdn.127.net nos.netease.com;connect-src * wss: blob: resource:;frame-src 'self' *.zhihu.com mailto: tel: weixin: *.vzuu.com mo.m.taobao.com getpocket.com note.youdao.com safari-extension://com.evernote.safari.clipper-Q79WDW8YH9 blob: mtt: zhihujs: captcha.guard.qcloud.com pos.baidu.com dup.baidustatic.com openapi.baidu.com wappass.baidu.com passport.baidu.com *.cme.qcloud.com vs-cdn.tencent-cloud.com t.captcha.qq.com *.dun.163yun.com *.dun.163.com *.126.net *.nosdn.127.net nos.netease.com;script-src 'self' blob: *.zhihu.com g.alicdn.com qzonestyle.gtimg.cn res.wx.qq.com open.mobile.qq.com 'unsafe-eval' unpkg.zhimg.com unicom.zhimg.com resource: zhihu-live.zhimg.com captcha.gtimg.com captcha.guard.qcloud.com pagead2.googlesyndication.com cpro.baidustatic.com pos.baidu.com dup.baidustatic.com i.hao61.net jsapi.qq.com 'nonce-f2026dec-225a-48e7-8dcd-667f1d5b4eb2' hm.baidu.com zz.bdstatic.com b.bdstatic.com imgcache.qq.com vs-cdn.tencent-cloud.com www.mangren.com www.yunmd.net zhihu.govwza.cn p.cnwza.cn gw.alipayobjects.com ssl.captcha.qq.com t.captcha.qq.com *.dun.163yun.com *.dun.163.com *.126.net *.nosdn.127.net nos.netease.com;style-src 'self' 'unsafe-inline' *.zhihu.com unpkg.zhimg.com unicom.zhimg.com resource: captcha.gtimg.com www.mangren.com ssl.captcha.qq.com t.captcha.qq.com *.dun.163yun.com *.dun.163.com *.126.net *.nosdn.127.net nos.netease.com;font-src * data:;frame-ancestors *.zhihu.com *.realsee.com *.realsee.cn
X-Frame-Options
Good
SAMEORIGIN
X-Content-Type-Options
Good
nosniff
Referrer-Policy
Good
no-referrer-when-downgrade
Permissions-Policy
Missing
Not configured
Recommendations
- • Increase HSTS max-age to at least 1 year and add includeSubDomains
- • Improve CSP by adding more specific directives and removing 'unsafe-inline'
- • Consider adding Permissions-Policy to control browser features
CAA Records (Certificate Authority Authorization)
CAA Records
Not Configured
(Any CA can issue certificates)
CAA Issues
- • No CAA records configured - any CA can issue certificates
Recommendations
- • Implement CAA records to restrict which CAs can issue certificates for your domain
- • This adds an extra layer of security against unauthorized certificate issuance
- • Example: Add CAA record 'example.com. CAA 0 issue "letsencrypt.org"'
- • Consider adding 'iodef' record to receive security incident reports