hm.baidu.com

Issued by Symantec Class 3 Secure Server CA - G4

About this certificate


This digital certificate with serial number 6b:ce:f3:3f:ce:30:ad:88:c2:23:cd:7d:df:35:1f:8c was issued on by Symantec Corporation .

While the certificate has already expired and will cause a warning or error message in the browser it's still listed on this site to allow you to look back on previously issued certificates.

Cerificate errors/warnings *beta

  • WARNING: Using depricated TeletexString for '[Organization and domain(s) authenticated by iTrus China]'

BeiJing Baidu Netcom Science Technology Co., Ltd

Organization: BeiJing Baidu Netcom Science Technology Co., Ltd
Organization unit: service operation department
Organization unit: Organization and domain(s) authenticated by iTrus China
State / Province: beijing
Locality: beijing
Country: CN

Symantec Corporation

Organization: Symantec Corporation
Organization unit: Symantec Trust Network
State / Province: beijing
Locality: beijing
Country: CN

Time since certificate expired

This certificate has expire since

Certificate Details

Serial Number (hex): 6b:ce:f3:3f:ce:30:ad:88:c2:23:cd:7d:df:35:1f:8c
Serial Number (int): 143301942382564858601437492908001664908
Serial Number lenght: 127 bits, 16 octets

SubjectKeyId:
AuthorityKeyId: 5f:60:cf:61:90:55:df:84:43:14:8a:60:2a:b2:f5:7a:f4:43:18:ef

Fingerprint (sha1): aa:82:f6:34:b7:fa:61:19:cf:7c:4b:44:42:07:9b:4b:b8:29:bd:87
Fingerprint (sha256): 45:1f:84:44:35:8d:1a:02:d6:09:af:29:7b:d5:97:63:e6:a0:e8:d5:df:47:6e:2f:c3:16:c6:0a:64:36:4a:ba

Issuing Certificate URL: http://ss.symcb.com/ss.crt

Revocation information

OCSP Server: http://ss.symcd.com
CRL Distribution Point: http://ss.symcb.com/ss.crl

Check the revocation status for the current certificate on hm.baidu.com
1
DNS Names
0
Email Addresses
0
IP Addresses

Advanced Certificate Properties

Technical details about this certificate


Public Key Algorithm

RSA

Key Size

2048

Signature Algorithm

SHA256 with RSA



Key Usage

Digital Signature
Key Encipherment

Extended Key Usages

Server Authentication
Client Authentication

Extensions

8 extensions
No unhandled critical extensions



CA Certificate

This is not a CA certificate

Subject Alternative Names

This certificate doesn't contain any other subject alternative names besides the common name of the subject: hm.baidu.com

Certificate

The complete raw certificate details in PEM and ASN.1 format.

Certificate (PEM)

-----BEGIN CERTIFICATE----- MIIFXDCCBESgAwIBAgIQa87zP84wrYjCI8193zUfjDANBgkqhkiG9w0BAQsFADB+ MQswCQYDVQQGEwJVUzEdMBsGA1UEChMUU3ltYW50ZWMgQ29ycG9yYXRpb24xHzAd BgNVBAsTFlN5bWFudGVjIFRydXN0IE5ldHdvcmsxLzAtBgNVBAMTJlN5bWFudGVj IENsYXNzIDMgU2VjdXJlIFNlcnZlciBDQSAtIEc0MB4XDTE0MTExMTAwMDAwMFoX DTE1MTEyMzIzNTk1OVowgewxCzAJBgNVBAYTAkNOMRAwDgYDVQQIDAdiZWlqaW5n MRAwDgYDVQQHDAdiZWlqaW5nMTkwNwYDVQQKDDBCZWlKaW5nIEJhaWR1IE5ldGNv bSBTY2llbmNlIFRlY2hub2xvZ3kgQ28uLCBMdGQxJTAjBgNVBAsMHHNlcnZpY2Ug b3BlcmF0aW9uIGRlcGFydG1lbnQxQDA+BgNVBAsUN09yZ2FuaXphdGlvbiBhbmQg ZG9tYWluKHMpIGF1dGhlbnRpY2F0ZWQgYnkgaVRydXMgQ2hpbmExFTATBgNVBAMM DGhtLmJhaWR1LmNvbTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBALeS j1heq0KsddcCW9b1odkuUZRsIHfbghiYQrEcHEuiw+EHNX5UnCfr8r0Qe0QeiCVc 0DrFMygkj5+R23Qc4R6GlJVIFWoIzDgpBm2jneQnuhwEQaqAvg8RsI9qLgsWBZee GL4ODmK6fbpelqo2YqQA8Hezt8X2JTzGx1eyBTcvsqR2LAZL/TKWldMKJ6aQ6NzO QFybDO0cC9XRE5U2IIklo7pmy0xRMXKDOWoD8yvVjyF+D4fUhriKRGbfUj6X869U H+fwQbB+fMag1K0nk7xMI6Z4HUAq59dY8cF7D/Vtir1dt4mncnHjNwo8JTrmAeu2 AWKbe2rOiuZJGPoCNtkCAwEAAaOCAWUwggFhMBcGA1UdEQQQMA6CDGhtLmJhaWR1 LmNvbTAJBgNVHRMEAjAAMA4GA1UdDwEB/wQEAwIFoDAdBgNVHSUEFjAUBggrBgEF BQcDAQYIKwYBBQUHAwIwZQYDVR0gBF4wXDBaBgpghkgBhvhFAQc2MEwwIwYIKwYB BQUHAgEWF2h0dHBzOi8vZC5zeW1jYi5jb20vY3BzMCUGCCsGAQUFBwICMBkaF2h0 dHBzOi8vZC5zeW1jYi5jb20vcnBhMB8GA1UdIwQYMBaAFF9gz2GQVd+EQxSKYCqy 9Xr0QxjvMCsGA1UdHwQkMCIwIKAeoByGGmh0dHA6Ly9zcy5zeW1jYi5jb20vc3Mu Y3JsMFcGCCsGAQUFBwEBBEswSTAfBggrBgEFBQcwAYYTaHR0cDovL3NzLnN5bWNk LmNvbTAmBggrBgEFBQcwAoYaaHR0cDovL3NzLnN5bWNiLmNvbS9zcy5jcnQwDQYJ KoZIhvcNAQELBQADggEBAE6Z9pn1a5+jxZydXHPpImYWDNI4MtExhu5wlCghBdDw ugSUOnTmCXz9AfcKQ1B9Fc6njKDWR02aY1+n93+dQgGxVqHP5G4hr57EY4lUn8Dw y02Sm9EM/pRKzXw/DdqPyO1Hm4ksLldpDouUxKnHCx1Al2vTxPeFg0irPMd9wFM+ BMLzJu7Ez9dTi8AaG2tj4Bx8IzGiu5BaHiksYYnXWRPYZtu66MWI9XUBNyX/flk9 Ncd14NGCEn0kYo6BNX1i87MjHAZORKnQU+DDDEsR9+AZ04yByZCHw+lns3qRRGI5 rPlKFWhHtJWWpjXwJHEopwU9fq1XAjSJ2HaSMwJ5xdM= -----END CERTIFICATE-----

Public Key (PEM)

-----BEGIN PUBLIC KEY----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAt5KPWF6rQqx11wJb1vWh 2S5RlGwgd9uCGJhCsRwcS6LD4Qc1flScJ+vyvRB7RB6IJVzQOsUzKCSPn5HbdBzh HoaUlUgVagjMOCkGbaOd5Ce6HARBqoC+DxGwj2ouCxYFl54Yvg4OYrp9ul6WqjZi pADwd7O3xfYlPMbHV7IFNy+ypHYsBkv9MpaV0wonppDo3M5AXJsM7RwL1dETlTYg iSWjumbLTFExcoM5agPzK9WPIX4Ph9SGuIpEZt9SPpfzr1Qf5/BBsH58xqDUrSeT vEwjpngdQCrn11jxwXsP9W2KvV23iadyceM3CjwlOuYB67YBYpt7as6K5kkY+gI2 2QIDAQAB -----END PUBLIC KEY-----

ASN1 Decoded

[c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . [c:2|t:0|true] OtherName . . . . . . . . . . . . [c:0|t:2|false] INTEGER 2 . . . . . . . . [c:0|t:2|false] INTEGER 143301942382564858601437492908001664908 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.11 (sha256WithRSAEncryption) . . . . . . . . . . . . [c:0|t:5|false] NULL . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.6 (countryName) . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'US' . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.10 (organizationName) . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'Symantec Corporation' . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.11 (organizationalUnitName) . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'Symantec Trust Network' . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.3 (commonName) . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'Symantec Class 3 Secure Server CA - G4' . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2014-11-11 00:00:00 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2015-11-23 23:59:59 +0000 UTC . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.6 (countryName) . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'CN' . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.8 (stateOrProvinceName) . . . . . . . . . . . . . . . . . . . . [c:0|t:12|false] UTF8String 'beijing' . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.7 (localityName) . . . . . . . . . . . . . . . . . . . . [c:0|t:12|false] UTF8String 'beijing' . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.10 (organizationName) . . . . . . . . . . . . . . . . . . . . [c:0|t:12|false] UTF8String 'BeiJing Baidu Netcom Science Technology Co., Ltd' . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.11 (organizationalUnitName) . . . . . . . . . . . . . . . . . . . . [c:0|t:12|false] UTF8String 'service operation department' . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.11 (organizationalUnitName) . . . . . . . . . . . . . . . . . . . . [c:0|t:20|false] TeletexString, T61String 'Organization and domain(s) authenticated by iTrus China' . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.3 (commonName) . . . . . . . . . . . . . . . . . . . . [c:0|t:12|false] UTF8String 'hm.baidu.com' . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.1 (rsaEncryption) . . . . . . . . . . . . . . . . [c:0|t:5|false] NULL . . . . . . . . . . . . [c:0|t:3|false] BIT STRING (2160 bits) . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 23173881209862861488620068968239392246104290813291397997043605008098168503977017274804198305881256250511418574859277763895706584264726730741688525740323526125486565748694753375008636688474193383139813301947804803661678530207931350965423331471980269654662344132782953103606679324852231455940104611541405838671497079621004433975672938387351111241343651768972620538171232108689661933222974111336261831831315254923880061309008177472711316966243434218378900674702579347489716848770737130058389773054030027850681879336071460250613608123142200296132630896248486468589794329313868558033691637782543196160483313230213227362009 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 65537 . . . . . . . . [c:2|t:3|true] ORAddress . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.17 (subjectAltName) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (16 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'hm.baidu.com' . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.19 (basicConstraints) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (2 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.15 (keyUsage) . . . . . . . . . . . . . . . . . . . . [c:0|t:1|false] BOOLEAN true . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (4 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:3|false] BIT STRING (3 bits) 05a0 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.37 (extKeyUsage) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (22 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.3.1 (serverAuth) . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.3.2 (clientAuth) . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.32 (certificatePolicies) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (94 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.16.840.1.113733.1.7.54 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.2.1 (cps) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:22|false] IA5String 'https://d.symcb.com/cps' . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.2.2 (unotice) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:26|false] VisibleString, ISO646String [104 116 116 112 115 58 47 47 100 46 115 121 109 99 98 46 99 111 109 47 114 112 97] . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.35 (authorityKeyIdentifier) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (24 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|false] OtherName 5f60cf619055df8443148a602ab2f57af44318ef . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.31 (cRLDistributionPoints) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (36 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|true] OtherName . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|true] OtherName . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://ss.symcb.com/ss.crl' . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.1.1 (authorityInfoAccess) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (75 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.48.1 (ocsp) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://ss.symcd.com' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.48.2 (caIssuers) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://ss.symcb.com/ss.crt' . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.11 (sha256WithRSAEncryption) . . . . . . . . [c:0|t:5|false] NULL . . . . [c:0|t:3|false] BIT STRING (2048 bits) 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