www.sustainability.hku.hk
Issued by Let's Encrypt Authority X3
About this certificate
This digital certificate with serial number 03:a4:39:4a:40:ca:19:ed:43:83:26:de:93:f2:b6:15:4a:85 was issued on by Let's Encrypt.
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- Subscriber Certificate: commonName is deprecated. (BRs: 7.1.4.2.2)
Certificate Subject
CN=www.sustainability.hku.hk
Let's Encrypt
Organization:
Let's Encrypt
Country:
US
This certificate has expire since
Certificate Details
Serial Number (hex): 03:a4:39:4a:40:ca:19:ed:43:83:26:de:93:f2:b6:15:4a:85Serial Number (int): 317219317510128247150936126670535897991813
Serial Number lenght: 138 bits, 18 octets
SubjectKeyId: a2:57:21:9a:ed:52:70:35:de:21:3f:5a:b3:61:3f:17:37:98:54:e1
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1
Fingerprint (sha1): f9:55:93:9b:11:cd:38:4f:2c:52:6c:46:be:6b:11:95:8f:f9:e9:23
Fingerprint (sha256): 01:68:6d:89:94:01:79:3a:67:0f:c5:f9:51:19:29:a3:f5:1d:e1:c7:8f:21:9b:11:a3:d3:20:ff:f0:f7:b6:48
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.sustainability.hku.hk
1
DNS Names
0
Email Addresses
0
IP Addresses
Advanced Certificate Properties
Tehnical certificate details for www.sustainability.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.sustainability.hku.hk
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Certificate
The complete raw certificate details for www.sustainability.hku.hk in PEM and ASN.1 format.
Certificate (PEM)
-----BEGIN CERTIFICATE----- MIIFbDCCBFSgAwIBAgISA6Q5SkDKGe1Dgybek/K2FUqFMA0GCSqGSIb3DQEBCwUA MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD ExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBYMzAeFw0xODEyMTAyMzU3NDlaFw0x OTAzMTAyMzU3NDlaMCQxIjAgBgNVBAMTGXd3dy5zdXN0YWluYWJpbGl0eS5oa3Uu aGswggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQCwb4AHBQS2AzNUPMWj 6BlqKvl4/eBoa/oHzbRuLTyrxX7HhGhKSGqsXUeVbK1TUNOEAQblKwcX/obJ6b4Y aGSDU9tegSo+n6H8KGnlArDfrlOHpY2tEjtVHw2H86NELli2ZLBJI/SXPnpxuW65 wpxjj1oat7mM09M9B+f2adgejhfvMXMmbTyb4OH6gJFOogUoLCZWQB/czGwjEpfW hjlg3JhSBqb3U/ESpHcOxzzNPQ/GJsumjGNKasVcgYQNxBYF5BFlW/g+PtfUzb6N VM3m1c7Pa/uj3xEvbGFO3f+Da4YzJJxw50uabaSnzsNcRE3kIi2rymxfarpUz6zG 00g1AgMBAAGjggJwMIICbDAOBgNVHQ8BAf8EBAMCBaAwHQYDVR0lBBYwFAYIKwYB BQUHAwEGCCsGAQUFBwMCMAwGA1UdEwEB/wQCMAAwHQYDVR0OBBYEFKJXIZrtUnA1 3iE/WrNhPxc3mFThMB8GA1UdIwQYMBaAFKhKamMEfd265tE5t6ZFZe/zqOyhMG8G CCsGAQUFBwEBBGMwYTAuBggrBgEFBQcwAYYiaHR0cDovL29jc3AuaW50LXgzLmxl dHNlbmNyeXB0Lm9yZzAvBggrBgEFBQcwAoYjaHR0cDovL2NlcnQuaW50LXgzLmxl dHNlbmNyeXB0Lm9yZy8wJAYDVR0RBB0wG4IZd3d3LnN1c3RhaW5hYmlsaXR5Lmhr dS5oazBMBgNVHSAERTBDMAgGBmeBDAECATA3BgsrBgEEAYLfEwEBATAoMCYGCCsG AQUFBwIBFhpodHRwOi8vY3BzLmxldHNlbmNyeXB0Lm9yZzCCAQYGCisGAQQB1nkC BAIEgfcEgfQA8gB3AOJpS64m6OlACeiGG7Y7g9Q+5/50iPukjyiTAZ3d8dv+AAAB Z5rFIboAAAQDAEgwRgIhAMeRjjCK1haBhsJ9H3++meZBXfajt1qXCcNtjWSPsIs/ AiEA5vS3jf2cTicdrsJv/BkWzImnFUIsWUx9ZTUHAK1+2MoAdwBj8tvN6DvMLM8L coQnV2szpI1hd4+9daY4scdoVEvYjQAAAWeaxSG6AAAEAwBIMEYCIQCExuG3hYHT DQm5CrmjL2qjqZPQJjQOG3W4xWGi1SRVwAIhAJJQPI6BdumgnZn7oXPq4t37ciS1 NugJunT+HrEoGuyfMA0GCSqGSIb3DQEBCwUAA4IBAQAy1GNijM0UC7qz8haSN6em M0Kf0ivV+VYsTqxgaG9vBo0Re4TxHuBMqs3OjSaHZGByj32fAeWv3KEL6BmPel9Z rjaicaRALJPMZ7E76tjQfvGrAl3+iU3EJJY45E6I94r/qaQXBWRrfmp02ur0sk1h ZKci7ndU+pd0k+c3gPIIqOwvl4r05kK/TkmLjY1IeUZCBv81D3WOP+5Vzc/0Lr4A uck3+Jw+SNXPVUUGhvBQQ6UDN5BNbK5MIRxVSoQSBLrxJBngEs5NXeROXm7pq7c0 w9V2CJxaEhJbVhtmkT2OsuhFd/4lonkam+KHqh3Z2/pisfH1QNDhiCuG9XjLFzqs -----END CERTIFICATE-----
Public Key (PEM)
-----BEGIN PUBLIC KEY----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAsG+ABwUEtgMzVDzFo+gZ air5eP3gaGv6B820bi08q8V+x4RoSkhqrF1HlWytU1DThAEG5SsHF/6Gyem+GGhk g1PbXoEqPp+h/Chp5QKw365Th6WNrRI7VR8Nh/OjRC5YtmSwSSP0lz56cbluucKc Y49aGre5jNPTPQfn9mnYHo4X7zFzJm08m+Dh+oCRTqIFKCwmVkAf3MxsIxKX1oY5 YNyYUgam91PxEqR3Dsc8zT0PxibLpoxjSmrFXIGEDcQWBeQRZVv4Pj7X1M2+jVTN 5tXOz2v7o98RL2xhTt3/g2uGMySccOdLmm2kp87DXERN5CItq8psX2q6VM+sxtNI NQIDAQAB -----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 317219317510128247150936126670535897991813 . . . . . . . . [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 2018-12-10 23:57:49 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-03-10 23:57:49 +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.sustainability.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 22272924426077808216879595022254687091963610571316468862292249541021747776007578600942909468710525581719335063196851655172140704094878152370030621286388987033992043486312675000956331518930855098529864748661112365763221618945772299708723145387186067693055578143939325092557843929803930346056204930707890200958163869820464271638874856931157448454719582379309341037596259204650958746716819024422959384128103914637845579461451837473219555459617664053083808076155400237367048643657852193407067471838826004390416007494820611052337113887873684903513955230965906150201523743431652670684532519867924330586267308285854475307061 . . . . . . . . . . . . . . . . . . . . [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) a257219aed527035de213f5ab3613f17379854e1 . . . . . . . . . . . . . . . . [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 (29 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.sustainability.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 (247 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (244 bytes) 00f2007700e2694bae26e8e94009e8861bb63b83d43ee7fe7488fba48f2893019dddf1dbfe000001679ac521ba0000040300483046022100c7918e308ad6168186c27d1f7fbe99e6415df6a3b75a9709c36d8d648fb08b3f022100e6f4b78dfd9c4e271daec26ffc1916cc89a715422c594c7d65350700ad7ed8ca00770063f2dbcde83bcc2ccf0b728427576b33a48d61778fbd75a638b1c768544bd88d000001679ac521ba000004030048304602210084c6e1b78581d30d09b90ab9a32f6aa3a993d026340e1b75b8c561a2d52455c002210092503c8e8176e9a09d99fba173eae2ddfb7224b536e809ba74fe1eb1281aec9f . . . . [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) 0032d463628ccd140bbab3f2169237a7a633429fd22bd5f9562c4eac60686f6f068d117b84f11ee04caacdce8d26876460728f7d9f01e5afdca10be8198f7a5f59ae36a271a4402c93cc67b13bead8d07ef1ab025dfe894dc4249638e44e88f78affa9a41705646b7e6a74daeaf4b24d6164a722ee7754fa977493e73780f208a8ec2f978af4e642bf4e498b8d8d4879464206ff350f758e3fee55cdcff42ebe00b9c937f89c3e48d5cf55450686f05043a50337904d6cae4c211c554a841204baf12419e012ce4d5de44e5e6ee9abb734c3d576089c5a12125b561b66913d8eb2e84577fe25a2791a9be287aa1dd9dbfa62b1f1f540d0e1882b86f578cb173aac