centre-documentation.esiea.fr

Issued by VeriSign Class 3 Secure Server CA - G3

About this certificate


This digital certificate with serial number 72:05:2c:ee:1a:00:82:38:3a:59:d9:75:4b:8b:ed:b8 was issued on by VeriSign, Inc. .

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 '[Paris]'
  • WARNING: Using depricated TeletexString for '[ECOLE SUP INFORMATIQUE ELECTRON AUTOMAT]'
  • WARNING: Using depricated TeletexString for '[Terms of use at www.verisign.com/rpa (c)05]'
  • WARNING: Using depricated TeletexString for '[centre-documentation.esiea.fr]'

ECOLE SUP INFORMATIQUE ELECTRON AUTOMAT

Organization: ECOLE SUP INFORMATIQUE ELECTRON AUTOMAT
Organization unit: Terms of use at www.verisign.com/rpa (c)05
State / Province: Paris
Locality: Paris
Country: FR

VeriSign, Inc.

Organization: VeriSign, Inc.
Organization unit: VeriSign Trust Network
Organization unit: Terms of use at https://www.verisign.com/rpa (c)10
State / Province: Paris
Locality: Paris
Country: FR

Time since certificate expired

This certificate has expire since

Certificate Details

Serial Number (hex): 72:05:2c:ee:1a:00:82:38:3a:59:d9:75:4b:8b:ed:b8
Serial Number (int): 151558864294145547917807702089508056504
Serial Number lenght: 127 bits, 16 octets

SubjectKeyId:
AuthorityKeyId: 0d:44:5c:16:53:44:c1:82:7e:1d:20:ab:25:f4:01:63:d8:be:79:a5

Fingerprint (sha1): 60:aa:3c:a3:2d:63:11:e6:35:8b:0b:43:89:88:8e:f7:f1:1b:46:46
Fingerprint (sha256): 5a:3d:cc:e1:af:84:8c:a7:36:73:44:c3:c2:8b:de:b2:be:18:64:8b:e1:66:e5:ca:99:ab:63:14:5a:b9:74:f4

Issuing Certificate URL: http://SVRSecure-G3-aia.verisign.com/SVRSecureG3.cer

Revocation information

OCSP Server: http://ocsp.verisign.com
CRL Distribution Point: http://SVRSecure-G3-crl.verisign.com/SVRSecureG3.crl

Check the revocation status for the current certificate on centre-documentation.esiea.fr
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

SHA1 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: centre-documentation.esiea.fr

Certificate

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

Certificate (PEM)

-----BEGIN CERTIFICATE----- MIIFjDCCBHSgAwIBAgIQcgUs7hoAgjg6Wdl1S4vtuDANBgkqhkiG9w0BAQUFADCB tTELMAkGA1UEBhMCVVMxFzAVBgNVBAoTDlZlcmlTaWduLCBJbmMuMR8wHQYDVQQL ExZWZXJpU2lnbiBUcnVzdCBOZXR3b3JrMTswOQYDVQQLEzJUZXJtcyBvZiB1c2Ug YXQgaHR0cHM6Ly93d3cudmVyaXNpZ24uY29tL3JwYSAoYykxMDEvMC0GA1UEAxMm VmVyaVNpZ24gQ2xhc3MgMyBTZWN1cmUgU2VydmVyIENBIC0gRzMwHhcNMTMxMjE4 MDAwMDAwWhcNMTQxMTI2MjM1OTU5WjCBvDELMAkGA1UEBhMCRlIxDjAMBgNVBAgT BVBhcmlzMQ4wDAYDVQQHFAVQYXJpczEwMC4GA1UEChQnRUNPTEUgU1VQIElORk9S TUFUSVFVRSBFTEVDVFJPTiBBVVRPTUFUMTMwMQYDVQQLFCpUZXJtcyBvZiB1c2Ug YXQgd3d3LnZlcmlzaWduLmNvbS9ycGEgKGMpMDUxJjAkBgNVBAMUHWNlbnRyZS1k b2N1bWVudGF0aW9uLmVzaWVhLmZyMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIB CgKCAQEAn1pIM2swvgwz18291oJwCrFtoWBYv7M80qpiBgOwLs9yD8Ms7m3K0dFi 7WMyisbz+6NLs3HQACD1CXWN8c92k2Q03GfkEh5XEmKAaYtuSnEHQ6UtF3hEjhFX fWZh3L1DuwYml2goJTi+AkzF2L90k3O2n84LcC1dvY/RbZU4qoqn8xKwzzwuvlnp as64eVL+GXaxv8OXu5oXTCQ/V7gdwemf2kkrhb7reRnrgx6iRU3cWfFudaahCqHI u89AACPA0ESJpLP0C7I4lZTH9TdBakRvXHGC4mPlDdSvM4GyIyL+h2qtjSLO4eKK GfMRxthFi0+/jKlFpVynoCCXaANpFwIDAQABo4IBjTCCAYkwKAYDVR0RBCEwH4Id Y2VudHJlLWRvY3VtZW50YXRpb24uZXNpZWEuZnIwCQYDVR0TBAIwADAOBgNVHQ8B Af8EBAMCBaAwRQYDVR0fBD4wPDA6oDigNoY0aHR0cDovL1NWUlNlY3VyZS1HMy1j cmwudmVyaXNpZ24uY29tL1NWUlNlY3VyZUczLmNybDBDBgNVHSAEPDA6MDgGCmCG SAGG+EUBBzYwKjAoBggrBgEFBQcCARYcaHR0cHM6Ly93d3cudmVyaXNpZ24uY29t L2NwczAdBgNVHSUEFjAUBggrBgEFBQcDAQYIKwYBBQUHAwIwHwYDVR0jBBgwFoAU DURcFlNEwYJ+HSCrJfQBY9i+eaUwdgYIKwYBBQUHAQEEajBoMCQGCCsGAQUFBzAB hhhodHRwOi8vb2NzcC52ZXJpc2lnbi5jb20wQAYIKwYBBQUHMAKGNGh0dHA6Ly9T VlJTZWN1cmUtRzMtYWlhLnZlcmlzaWduLmNvbS9TVlJTZWN1cmVHMy5jZXIwDQYJ KoZIhvcNAQEFBQADggEBAJ+OFaB/6OrKIsTVrFT8CI10TQ1qq/xVu/+pD6WjMspb CS4BXwch6bfyr9NKEF7jaY5bYIpZ5ckK/aSE0QzneHcqlTH2vVLOwdzRzRH+unHV cuzpPOtk0BLAZ+YrNi1cITUbeQs6q7rWfn7eN8WAQouhWzaJcQ/ikDPaIJNiZHHl ZFQFB3WqVMKszk9naMqgmdouGEgmqQBHZ7gDBkwLSLsr2Yis2vOco37JXJ2rM8Dm syhlJesGwRJ3Z1we8jbTnt4bRBplGn5NV57VUGewybwquQXuje7pYl73g4WIbME0 a+K0qGDYEbp+/+MrMFnBMURwUn//9zIyLqngLQKuCOw= -----END CERTIFICATE-----

Public Key (PEM)

-----BEGIN PUBLIC KEY----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAn1pIM2swvgwz18291oJw CrFtoWBYv7M80qpiBgOwLs9yD8Ms7m3K0dFi7WMyisbz+6NLs3HQACD1CXWN8c92 k2Q03GfkEh5XEmKAaYtuSnEHQ6UtF3hEjhFXfWZh3L1DuwYml2goJTi+AkzF2L90 k3O2n84LcC1dvY/RbZU4qoqn8xKwzzwuvlnpas64eVL+GXaxv8OXu5oXTCQ/V7gd wemf2kkrhb7reRnrgx6iRU3cWfFudaahCqHIu89AACPA0ESJpLP0C7I4lZTH9TdB akRvXHGC4mPlDdSvM4GyIyL+h2qtjSLO4eKKGfMRxthFi0+/jKlFpVynoCCXaANp FwIDAQAB -----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 151558864294145547917807702089508056504 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.5 (sha1WithRSAEncryption) . . . . . . . . . . . . [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 'VeriSign, Inc.' . . . . . . . . . . . . [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 'VeriSign 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 2.5.4.11 (organizationalUnitName) . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'Terms of use at https://www.verisign.com/rpa (c)10' . . . . . . . . . . . . [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 'VeriSign Class 3 Secure Server CA - G3' . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2013-12-18 00:00:00 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2014-11-26 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 'FR' . . . . . . . . . . . . [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:19|false] PrintableString 'Paris' . . . . . . . . . . . . [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:20|false] TeletexString, T61String 'Paris' . . . . . . . . . . . . [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:20|false] TeletexString, T61String 'ECOLE SUP INFORMATIQUE ELECTRON AUTOMAT' . . . . . . . . . . . . [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 'Terms of use at www.verisign.com/rpa (c)05' . . . . . . . . . . . . [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:20|false] TeletexString, T61String 'centre-documentation.esiea.fr' . . . . . . . . [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 20116410220131392432823197626000009935008672330861699493166251348532709243075076096678995990197613651995762957094075993057761628918213320030952080994385862200112339635272856697780644581836186012961422451423685356019695027289322596682771750703398450064800076893384656539243744300605444033962809239955139112026283135582627820994777867990153072418720273376848555069302042844202270220919503894470247855873157343060471683579973289328858629906576008122294418604884747498957916816869549183383208131900980346889508982557000948517328454722525973419932743273390614255442594673649385601086289904214753690973585876436295883122967 . . . . . . . . . . . . . . . . . . . . [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 (33 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'centre-documentation.esiea.fr' . . . . . . . . . . . . . . . . [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 2.5.29.31 (cRLDistributionPoints) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (62 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://SVRSecure-G3-crl.verisign.com/SVRSecureG3.crl' . . . . . . . . . . . . . . . . [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 (60 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://www.verisign.com/cps' . . . . . . . . . . . . . . . . [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 2.5.29.35 (authorityKeyIdentifier) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (24 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|false] OtherName 0d445c165344c1827e1d20ab25f40163d8be79a5 . . . . . . . . . . . . . . . . [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 (106 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://ocsp.verisign.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://SVRSecure-G3-aia.verisign.com/SVRSecureG3.cer' . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.5 (sha1WithRSAEncryption) . . . . . . . . [c:0|t:5|false] NULL . . . . [c:0|t:3|false] BIT STRING (2048 bits) 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