www.upo.hkusu.hku.hk
Issued by Let's Encrypt Authority X3
About this certificate
This digital certificate with serial number 03:16:8f:a3:0f:df:3b:4c:56:b9:e1:cb:ae:5d:6f:15:c5:82 was issued on by Let's Encrypt.
This 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. If we have found any compliance issues with this certificate they will be shown below. I hope this certificate review is providing you the detailed information in a simple form you where looking for.
We have idenified some issues with this certificate:
- Subscriber Certificate: commonName is deprecated. (BRs: 7.1.4.2.2)
Certificate Subject
CN=www.upo.hkusu.hku.hk
Let's Encrypt
Organization:
Let's Encrypt
Country:
US
This certificate has expire since
Certificate Details
Serial Number (hex): 03:16:8f:a3:0f:df:3b:4c:56:b9:e1:cb:ae:5d:6f:15:c5:82Serial Number (int): 269013996137248946481744823935280629532034
Serial Number lenght: 138 bits, 18 octets
SubjectKeyId: 8d:a6:2b:87:65:bb:0b:7d:eb:b7:e3:11:b6:ec:3a:e9:d7:1f:2d:d9
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1
Fingerprint (sha1): be:da:1e:5d:23:15:17:52:fe:f4:4c:91:ff:88:ae:bb:63:7d:c4:a5
Fingerprint (sha256): 00:88:4b:cc:3f:b8:f1:96:7e:00:de:c6:e7:f5:a9:fa:1d:e8:3e:94:b1:08:39:6e:8b:71:f8:1d:65:5e:89:e4
Issuing Certificate URL: http://cert.int-x3.letsencrypt.org/
Revocation information
OCSP Server: http://ocsp.int-x3.letsencrypt.orgCheck the revocation status for certificate www.upo.hkusu.hku.hk
1
DNS Names
0
Email Addresses
0
IP Addresses
Advanced Certificate Properties
Tehnical certificate details for www.upo.hkusu.hku.hk
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
9 extensions
No
unhandled critical extensions
CA Certificate
This is not a CA certificate
Subject Alternative Names
www.upo.hkusu.hku.hk
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Certificate
The complete raw certificate details for www.upo.hkusu.hku.hk in PEM and ASN.1 format.
Certificate (PEM)
-----BEGIN CERTIFICATE----- MIIFYTCCBEmgAwIBAgISAxaPow/fO0xWueHLrl1vFcWCMA0GCSqGSIb3DQEBCwUA MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD ExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBYMzAeFw0xOTA0MTAyMzMwMDRaFw0x OTA3MDkyMzMwMDRaMB8xHTAbBgNVBAMTFHd3dy51cG8uaGt1c3UuaGt1LmhrMIIB IjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA02jiIRm1AjrpQ1PPlV9KfFcq nrxmHsMQlwvsrFyRFZLPVockK5uFl4RKP/a27A0muNNJt9OaBbB2XMI9SdO7klpu x7Twpknhdm7Dk5yMp/UEp7Lq3IPdrnToKvvTXvllRISruWnk8BVUDe6WNAbS2jGP OmJ6UBAFpsG4w8iky6zfDwfrZ+E1oSPfVpGn4HkjEUOkxdwlMnF7NwSdav0EfL0q +hdv+2r1CLWNWbJDlnSkWFl//O7V8Rn/POec/yLEcghYw8sQXw1SxBjv2CtQ2z6V Akxg2+8KItxy+xLnlvPa4wk50AmPV6CGkzFutPVS2NtW5GnkKHwRKT72cX3v+QID AQABo4ICajCCAmYwDgYDVR0PAQH/BAQDAgWgMB0GA1UdJQQWMBQGCCsGAQUFBwMB BggrBgEFBQcDAjAMBgNVHRMBAf8EAjAAMB0GA1UdDgQWBBSNpiuHZbsLfeu34xG2 7Drp1x8t2TAfBgNVHSMEGDAWgBSoSmpjBH3duubRObemRWXv86jsoTBvBggrBgEF BQcBAQRjMGEwLgYIKwYBBQUHMAGGImh0dHA6Ly9vY3NwLmludC14My5sZXRzZW5j cnlwdC5vcmcwLwYIKwYBBQUHMAKGI2h0dHA6Ly9jZXJ0LmludC14My5sZXRzZW5j cnlwdC5vcmcvMB8GA1UdEQQYMBaCFHd3dy51cG8uaGt1c3UuaGt1LmhrMEwGA1Ud IARFMEMwCAYGZ4EMAQIBMDcGCysGAQQBgt8TAQEBMCgwJgYIKwYBBQUHAgEWGmh0 dHA6Ly9jcHMubGV0c2VuY3J5cHQub3JnMIIBBQYKKwYBBAHWeQIEAgSB9gSB8wDx AHcA4mlLribo6UAJ6IYbtjuD1D7n/nSI+6SPKJMBnd3x2/4AAAFqCc0y3AAABAMA SDBGAiEAi/wTA34rnvY3gfefqI30lnH60ar6LfNSAFRqwswPMP4CIQDrKfMeAx9i iGcVqd94t/CQ3EPLuNPJCThbI/XL16Ef4QB2AGPy283oO8wszwtyhCdXazOkjWF3 j711pjixx2hUS9iNAAABagnNNNQAAAQDAEcwRQIhAL/CYKdw/9H9jIWkdnPajnio 9Sn7xGa2BsIM3LqOw1I9AiAqiiC18kSlejrdP3U4VdRxKvXz9YMMD26hytPKAC06 TTANBgkqhkiG9w0BAQsFAAOCAQEAUf3I8YsavvhM9k0Zy5WVdvmKa/xlyrSHpSSk 6nlcPsL0YiLvQIMbQiyHes0fKnQDW3XUzXPvEGbT1ZqSrMpyCDFeIw0eOs3r44Y7 XG3f7/dCt/H9P/5Pwe2tsTGgtGyztYc/SeBdQ/bCUogSuvMZtt2et31BgiDJwLqD iYT3bpujopny7G6xIMkUicpMnWNQ67aFU4jvsUN/gi3IpwyRoIP955h8Dx+XCC1H T8UWqfkwMNlelfD0AIuWq3M/AxGoMZG2g0FzY/1gh5FbbFOn9ZfxtgNFT/9UkKMy 1vVihRDWZCwyhC5tn5BDhfpoIsFrLFm/hrGp+2+LQrVUxdKPlA== -----END CERTIFICATE-----
Public Key (PEM)
-----BEGIN PUBLIC KEY----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA02jiIRm1AjrpQ1PPlV9K fFcqnrxmHsMQlwvsrFyRFZLPVockK5uFl4RKP/a27A0muNNJt9OaBbB2XMI9SdO7 klpux7Twpknhdm7Dk5yMp/UEp7Lq3IPdrnToKvvTXvllRISruWnk8BVUDe6WNAbS 2jGPOmJ6UBAFpsG4w8iky6zfDwfrZ+E1oSPfVpGn4HkjEUOkxdwlMnF7NwSdav0E fL0q+hdv+2r1CLWNWbJDlnSkWFl//O7V8Rn/POec/yLEcghYw8sQXw1SxBjv2CtQ 2z6VAkxg2+8KItxy+xLnlvPa4wk50AmPV6CGkzFutPVS2NtW5GnkKHwRKT72cX3v +QIDAQAB -----END PUBLIC KEY-----
ASN.1 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 269013996137248946481744823935280629532034 . . . . . . . . [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 'Let's Encrypt' . . . . . . . . . . . . [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 'Let's Encrypt Authority X3' . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-04-10 23:30:04 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-07-09 23:30:04 +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 2.5.4.3 (commonName) . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'www.upo.hkusu.hku.hk' . . . . . . . . [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 26688002239360025262256481659321767922330881069224318221490253143219407961369089926127158662797891404372686035621847050167511133017899122178484181800807982960133432135215780037723875590806944313358922976352315560996404571418122300309240410259113344295225622291392660826581942218174618011652846978505502495812038829628205523852722792926231473681664083923082145497113501691608160161835446511196697101800119957251560235589032960742884641810365716252698430709020447372085862190671714602540437449919271478309451695772431843487010284688262096059183748130095124332060596301175186133561684573583226156468010420383471481253881 . . . . . . . . . . . . . . . . . . . . [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 2.5.29.15 (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 2.5.29.19 (basicConstraints) . . . . . . . . . . . . . . . . . . . . [c:0|t:1|false] BOOLEAN true . . . . . . . . . . . . . . . . . . . . [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 2.5.29.14 (subjectKeyIdentifier) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (22 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (20 bytes) 8da62b8765bb0b7debb7e311b6ec3ae9d71f2dd9 . . . . . . . . . . . . . . . . [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 a84a6a63047dddbae6d139b7a64565eff3a8eca1 . . . . . . . . . . . . . . . . [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 (99 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.int-x3.letsencrypt.org' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [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://cert.int-x3.letsencrypt.org/' . . . . . . . . . . . . . . . . [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 (24 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.upo.hkusu.hku.hk' . . . . . . . . . . . . . . . . [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 (69 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.23.140.1.2.1 (Domain Validation Certificates Policy) . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.4.1.44947.1.1.1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [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 'http://cps.letsencrypt.org' . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.4.1.11129.2.4.2 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (246 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (243 bytes) 00f1007700e2694bae26e8e94009e8861bb63b83d43ee7fe7488fba48f2893019dddf1dbfe0000016a09cd32dc00000403004830460221008bfc13037e2b9ef63781f79fa88df49671fad1aafa2df35200546ac2cc0f30fe022100eb29f31e031f62886715a9df78b7f090dc43cbb8d3c909385b23f5cbd7a11fe100760063f2dbcde83bcc2ccf0b728427576b33a48d61778fbd75a638b1c768544bd88d0000016a09cd34d40000040300473045022100bfc260a770ffd1fd8c85a47673da8e78a8f529fbc466b606c20cdcba8ec3523d02202a8a20b5f244a57a3add3f753855d4712af5f3f5830c0f6ea1cad3ca002d3a4d . . . . [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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