hku-utokyo-summer.hku.hk
Issued by Let's Encrypt Authority X3
About this certificate
This digital certificate with serial number 03:f5:89:37:25:31:e7:75:f5:85:53:ec:cf:38:0e:97:aa:7f was issued on by Let's Encrypt.
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Certificate Subject
CN=hku-utokyo-summer.hku.hk
Let's Encrypt
Organization:
Let's Encrypt
Country:
US
This certificate has expire since
Certificate Details
Serial Number (hex): 03:f5:89:37:25:31:e7:75:f5:85:53:ec:cf:38:0e:97:aa:7fSerial Number (int): 344888428257063385317845504624664298105471
Serial Number lenght: 138 bits, 18 octets
SubjectKeyId: 4e:e0:4b:53:44:02:63:dc:f9:16:7a:53:dd:79:b1:39:1e:9c:61:82
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1
Fingerprint (sha1): 0e:79:94:60:54:b0:94:1a:76:3a:b9:1c:ed:33:e1:5b:3b:b3:0c:f5
Fingerprint (sha256): 02:fe:2e:19:2d:13:3e:af:01:8b:7a:8a:b1:47:78:a5:7d:ba:56:ed:df:cd:0c:d1:12:f1:97:8a:0e:19:f0:1a
Issuing Certificate URL: http://cert.int-x3.letsencrypt.org/
Revocation information
OCSP Server: http://ocsp.int-x3.letsencrypt.orgCheck the revocation status for certificate hku-utokyo-summer.hku.hk
1
DNS Names
0
Email Addresses
0
IP Addresses
Advanced Certificate Properties
Tehnical certificate details for hku-utokyo-summer.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
hku-utokyo-summer.hku.hk
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Certificate
The complete raw certificate details for hku-utokyo-summer.hku.hk in PEM and ASN.1 format.
Certificate (PEM)
-----BEGIN CERTIFICATE----- MIIFZzCCBE+gAwIBAgISA/WJNyUx53X1hVPszzgOl6p/MA0GCSqGSIb3DQEBCwUA MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD ExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBYMzAeFw0xOTEyMjkyMzI5MjhaFw0y MDAzMjgyMzI5MjhaMCMxITAfBgNVBAMTGGhrdS11dG9reW8tc3VtbWVyLmhrdS5o azCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBANS3QXMKKmLhjog2CGoB AvxC2EtTtXO2cq5p8dSnUFRnW7wOVF3G+JA0mMGIMUqwFCZgWWMQQX+byWMBKstF Im25FRsCkt98hVcIHt8TIwyhQo0KLYfoVZU7awdihdilMxUcrNkJ7moTTrPAVIcs FHg51RslgwIApVXBB+D4E+Tx3jyieO4BRZpvcKJgiRiPw/h8IMfBlj/T5t+2FDu0 g/+OniPkblQSZPe3dtUW0ePH80+m1vqvoRICba+UX+FOWEz18vXrR7603XhZhPf3 VdpH+gUB1tjKotibZdJATSm+CXLt5imb4PLlzN1i6h9vAkpvM4sNLfwb3fSwSdDJ lLUCAwEAAaOCAmwwggJoMA4GA1UdDwEB/wQEAwIFoDAdBgNVHSUEFjAUBggrBgEF BQcDAQYIKwYBBQUHAwIwDAYDVR0TAQH/BAIwADAdBgNVHQ4EFgQUTuBLU0QCY9z5 FnpT3XmxOR6cYYIwHwYDVR0jBBgwFoAUqEpqYwR93brm0Tm3pkVl7/Oo7KEwbwYI KwYBBQUHAQEEYzBhMC4GCCsGAQUFBzABhiJodHRwOi8vb2NzcC5pbnQteDMubGV0 c2VuY3J5cHQub3JnMC8GCCsGAQUFBzAChiNodHRwOi8vY2VydC5pbnQteDMubGV0 c2VuY3J5cHQub3JnLzAjBgNVHREEHDAaghhoa3UtdXRva3lvLXN1bW1lci5oa3Uu aGswTAYDVR0gBEUwQzAIBgZngQwBAgEwNwYLKwYBBAGC3xMBAQEwKDAmBggrBgEF BQcCARYaaHR0cDovL2Nwcy5sZXRzZW5jcnlwdC5vcmcwggEDBgorBgEEAdZ5AgQC BIH0BIHxAO8AdQAHt1wb5X1o//Gwxh0jFce65ld8V5S3au68YToaadOiHAAAAW9U NSrTAAAEAwBGMEQCIHhTHSDD9pMnPKlCEiHzO9zHG+/PYoQpoNtx3bju7Yj3AiB/ V4FKoB1mvtvmP7tsapXxbMMpt9tnGjn9xGhV+yrdNwB2AG9Tdqwx8DEZ2JkApFEV /3cVHBHZAsEAKQaNsgiaN9kTAAABb1Q1K3QAAAQDAEcwRQIhAMjk+4k0pY9mJCME 65Mmjz8s+RBQUHlCru9G6ivgMWY4AiB/kq61Ol9wiW8CFOwyXDESxYVaAHzJQBuF bgHkHNkheTANBgkqhkiG9w0BAQsFAAOCAQEASrfimjvtbs4ysKMhmUpljPTQdOEE Ob8CoeaKBs6AXWYmE4Ugyc3ffsVrtk53lT+mY6ELKT53l5Z72aafp3r8dwDgab2+ qqHKlnGxuaTtRcIH4jKVx0PKWY5OVVXukA6F/WFC4Wew1ISK2dPLCycCZF8+W3fe 8Yic12dYSGCKbUwhFLoA9qP7bSXZoXpMIq70F/Sk3+zNU4Pgf9iV8yOt77SjvL1G nDwZbUWrR/e8OEUVPabuVYliUYBeOn+hgjvCinV0fiKQ+2JENtpujisi/l51yxtQ 5FXh8fbC8/KxfM7I3vvSCd9CrCVj3JY62n7NqELT/k1KRXBrGs26gXaeBw== -----END CERTIFICATE-----
Public Key (PEM)
-----BEGIN PUBLIC KEY----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA1LdBcwoqYuGOiDYIagEC /ELYS1O1c7Zyrmnx1KdQVGdbvA5UXcb4kDSYwYgxSrAUJmBZYxBBf5vJYwEqy0Ui bbkVGwKS33yFVwge3xMjDKFCjQoth+hVlTtrB2KF2KUzFRys2QnuahNOs8BUhywU eDnVGyWDAgClVcEH4PgT5PHePKJ47gFFmm9womCJGI/D+Hwgx8GWP9Pm37YUO7SD /46eI+RuVBJk97d21RbR48fzT6bW+q+hEgJtr5Rf4U5YTPXy9etHvrTdeFmE9/dV 2kf6BQHW2Mqi2Jtl0kBNKb4Jcu3mKZvg8uXM3WLqH28CSm8ziw0t/Bvd9LBJ0MmU tQIDAQAB -----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 344888428257063385317845504624664298105471 . . . . . . . . [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 2019-12-29 23:29:28 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-03-28 23:29:28 +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 'hku-utokyo-summer.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 26852887387561929667543840807701947007773871687811459169679624005867479809408040358671039497428576247617184554504700015653719393278471773895691141639081732220151078009189124743414112403550677253507622182496834168810844684547535452945751549367062971187564025494272557438559856465721083584153316863078638464223891419646360572528224241681947373026227695474092870737107278859859136586741527078591024052977397037015160453815406262779507120577565782000319097307804797057257802225061124348076376496610314051848321854183824442825974589531212743217443117260314283539023698198575169393176879441035634110757870864879699628758197 . . . . . . . . . . . . . . . . . . . . [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) 4ee04b53440263dcf9167a53dd79b1391e9c6182 . . . . . . . . . . . . . . . . [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 (28 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'hku-utokyo-summer.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 (244 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (241 bytes) 00ef00750007b75c1be57d68fff1b0c61d2315c7bae6577c5794b76aeebc613a1a69d3a21c0000016f54352ad30000040300463044022078531d20c3f693273ca9421221f33bdcc71befcf628429a0db71ddb8eeed88f702207f57814aa01d66bedbe63fbb6c6a95f16cc329b7db671a39fdc46855fb2add370076006f5376ac31f03119d89900a45115ff77151c11d902c10029068db2089a37d9130000016f54352b740000040300473045022100c8e4fb8934a58f66242304eb93268f3f2cf91050507942aeef46ea2be031663802207f92aeb53a5f70896f0214ec325c3112c5855a007cc9401b856e01e41cd92179 . . . . [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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