Certificate summary -

Owner: www.stumbleupon.com, "StumbleUpon, Inc.", L=San Francisco, ST=California, US, SERIALNUMBER=4670769, OID.1.3.6.1.4.1.311.60.2.1.2=Delaware, OID.1.3.6.1.4.1.311.60.2.1.3=US, OID.2.5.4.15=Private Organization

Issuer: GeoTrust Extended Validation SSL CA, See www.geotrust.com/resources/cps (c)06, GeoTrust Inc, US

Expiration: Sun Dec 22 20:04:52 EST 2013

MD5: 95:FC:7F:E2:71:80:BB:F1:23:83:5A:C7:28:A3:5E:04

Hash: Owner Hash=b0d00f8a, Issuer Hash=b06f9739

Information extracted out of the certificate:

Owner: CN=www.stumbleupon.com, O="StumbleUpon, Inc.", L=San Francisco,
ST=California, C=US, SERIALNUMBER=4670769,
OID.1.3.6.1.4.1.311.60.2.1.2=Delaware, OID.1.3.6.1.4.1.311.60.2.1.3=US,
OID.2.5.4.15=Private Organization
Issuer: CN=GeoTrust Extended Validation SSL CA, OU=See
www.geotrust.com/resources/cps (c)06, O=GeoTrust Inc, C=US
Serial number: 29a0
Valid from: Tue Dec 20 18:48:56 EST 2011 until: Sun Dec 22 20:04:52 EST
2013
Certificate fingerprints:
	 MD5:  95:FC:7F:E2:71:80:BB:F1:23:83:5A:C7:28:A3:5E:04
	 SHA1: 0B:B1:B9:DB:AA:BB:29:EA:AD:69:F3:DF:CF:37:DC:00:37:62:40:C5
	 Signature algorithm name: SHA1withRSA
	 Version: 3

Extensions: 

#1: ObjectId: 2.5.29.15 Criticality=true
KeyUsage [
  DigitalSignature
  Key_Encipherment
]

#2: ObjectId: 2.5.29.19 Criticality=true
BasicConstraints:[
  CA:false
  PathLen: undefined
]

#3: ObjectId: 1.3.6.1.5.5.7.1.1 Criticality=false
AuthorityInfoAccess [
  [
   accessMethod: 1.3.6.1.5.5.7.48.1
   accessLocation: URIName: http://EVSSL-ocsp.geotrust.com, 
   accessMethod: 1.3.6.1.5.5.7.48.2
   accessLocation: URIName: http://EVSSL-aia.geotrust.com/evca.crt]
]

#4: ObjectId: 2.5.29.31 Criticality=false
CRLDistributionPoints [
  [DistributionPoint:
     [URIName: http://EVSSL-crl.geotrust.com/crls/gtextvalca.crl]
]]

#5: ObjectId: 2.5.29.32 Criticality=false
CertificatePolicies [
  [CertificatePolicyId: [1.3.6.1.4.1.14370.1.6]
[PolicyQualifierInfo: [
  qualifierID: 1.3.6.1.5.5.7.2.1
  qualifier: 0000: 16 25 68 74 74 70 3A 2F   2F 77 77 77 2E 67 65 6F 
.%http://www.geo
0010: 74 72 75 73 74 2E 63 6F	6D 2F 72 65 73 6F 75 72  trust.com/resour
0020: 63 65 73 2F 63 70 73				 ces/cps

]]  ]
]

#6: ObjectId: 2.5.29.37 Criticality=false
ExtendedKeyUsages [
  serverAuth
  clientAuth
]

#7: ObjectId: 2.5.29.35 Criticality=false
AuthorityKeyIdentifier [
KeyIdentifier [
0000: 28 C4 EB 8F F1 5F 79 90	A3 2B 55 C3 56 4E 7D 6B  (...._y..+U.VN.k
0010: 53 72 2C 18					 Sr,.
]

]

#8: ObjectId: 2.5.29.17 Criticality=false
SubjectAlternativeName [
  DNSName: www.stumbleupon.com
  DNSName: stumbleupon.com
]

Certificate in PEM format (Base64 encoded X.509):

-----BEGIN CERTIFICATE-----
MIIFbjCCBFagAwIBAgICKaAwDQYJKoZIhvcNAQEFBQAwgYUxCzAJBgNVBAYTAlVT
MRUwEwYDVQQKEwxHZW9UcnVzdCBJbmMxMTAvBgNVBAsTKFNlZSB3d3cuZ2VvdHJ1
c3QuY29tL3Jlc291cmNlcy9jcHMgKGMpMDYxLDAqBgNVBAMTI0dlb1RydXN0IEV4
dGVuZGVkIFZhbGlkYXRpb24gU1NMIENBMB4XDTExMTIyMDIzNDg1NloXDTEzMTIy
MzAxMDQ1MlowgdUxHTAbBgNVBA8TFFByaXZhdGUgT3JnYW5pemF0aW9uMRMwEQYL
KwYBBAGCNzwCAQMTAlVTMRkwFwYLKwYBBAGCNzwCAQITCERlbGF3YXJlMRAwDgYD
VQQFEwc0NjcwNzY5MQswCQYDVQQGEwJVUzETMBEGA1UECBMKQ2FsaWZvcm5pYTEW
MBQGA1UEBxMNU2FuIEZyYW5jaXNjbzEaMBgGA1UEChMRU3R1bWJsZVVwb24sIElu
Yy4xHDAaBgNVBAMTE3d3dy5zdHVtYmxldXBvbi5jb20wggEiMA0GCSqGSIb3DQEB
AQUAA4IBDwAwggEKAoIBAQCvWwvAPJja0o0SvAee1roqF0OXp4vKuXfrSSc+E/3a
tIK+Dj+fh2rgpO4rcyM+lJ1DpfLb9jQR+9X+fpCjOEo5QMRr69B/r4+YQBflNr27
xCbsiR2RsJfHr00Cii8nFPg7dB0NqHbjIBpU3Zl9If04JaTJ9O7xPrO4uDlBGed3
xX46WSCogvMOt55TQdWV+EIMWsQEKGbLMR+mwfqzoPalB7p4Zgvl8B11O9jMVdv0
zybCvxg1p8LBpKyaM0jmfp2HCiwihoyM0n5IcU9tOtfmUJK2KwW/R/8MSbzDgafd
KAa5SkIc8LAAfcDiokZlbISv0wtSmmHqCvGUa5eGPzrxAgMBAAGjggGUMIIBkDAf
BgNVHSMEGDAWgBQoxOuP8V95kKMrVcNWTn1rU3IsGDBuBggrBgEFBQcBAQRiMGAw
KgYIKwYBBQUHMAGGHmh0dHA6Ly9FVlNTTC1vY3NwLmdlb3RydXN0LmNvbTAyBggr
BgEFBQcwAoYmaHR0cDovL0VWU1NMLWFpYS5nZW90cnVzdC5jb20vZXZjYS5jcnQw
DgYDVR0PAQH/BAQDAgWgMB0GA1UdJQQWMBQGCCsGAQUFBwMBBggrBgEFBQcDAjAv
BgNVHREEKDAmghN3d3cuc3R1bWJsZXVwb24uY29tgg9zdHVtYmxldXBvbi5jb20w
QgYDVR0fBDswOTA3oDWgM4YxaHR0cDovL0VWU1NMLWNybC5nZW90cnVzdC5jb20v
Y3Jscy9ndGV4dHZhbGNhLmNybDAMBgNVHRMBAf8EAjAAMEsGA1UdIAREMEIwQAYJ
KwYBBAHwIgEGMDMwMQYIKwYBBQUHAgEWJWh0dHA6Ly93d3cuZ2VvdHJ1c3QuY29t
L3Jlc291cmNlcy9jcHMwDQYJKoZIhvcNAQEFBQADggEBALiSSV/Md+5MCGo0pyC4
ggDDJbfKfytbNrrjVXfUUwGeG9K593aIeTKffKg+dq+35Pft2qvwCWSkniCeaVNR
qXkWFgfXzncNrAQeRsh/zsWDRB0Nlsm/lQJh3rvvU32EOxc9Sty5zl71IaZxMU4J
3GHEyVlwaMfIibZScmYJW5JSZHA5rAbHuixbe5plZ6J/F8KD5FRjdRf2OukaTdOp
zsE0ELDcNLdbLpfohH/9vZGam+yb0BVcccLWRlv8fyQ0C84KQZtbN2GT2DohbLfr
3IuCgDAwTPCtC7n/kT4IQRlDvUNLVNXLwll59YctOsWqOPl1PPXBIBqP8oGkYZF1
YS0=
-----END CERTIFICATE-----

Visit the Web site using this certificate: https://www.stumbleupon.com

Search for the certificate of the issuer.