www.mathsoc.hkusu.hku.hk
Issued by Let's Encrypt Authority X3
About this certificate
This digital certificate with serial number 04:b3:bc:66:a4:84:43:dc:0f:7e:a2:1c:7c:df:40:bf:60:e2 was issued on by Let's Encrypt.
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Certificate Subject
CN=www.mathsoc.hkusu.hku.hk
Let's Encrypt
Organization:
Let's Encrypt
Country:
US
This certificate has expire since
Certificate Details
Serial Number (hex): 04:b3:bc:66:a4:84:43:dc:0f:7e:a2:1c:7c:df:40:bf:60:e2Serial Number (int): 409610115220170400266230334351259331420386
Serial Number lenght: 139 bits, 18 octets
SubjectKeyId: 27:1b:8e:9d:5f:51:cb:35:19:a0:00:8f:98:2e:6e:a0:87:69:75:d0
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1
Fingerprint (sha1): 33:ec:6c:0c:b1:13:0e:3b:55:ad:9d:bc:cb:53:3d:f1:d7:ab:0e:cd
Fingerprint (sha256): 01:1a:6c:37:07:f9:2e:16:86:97:56:04:13:ca:d3:15:6c:27:51:a8:d1:f2:05:4f:4f:a8:dc:07:08:1c:b6:12
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.mathsoc.hkusu.hku.hk
1
DNS Names
0
Email Addresses
0
IP Addresses
Advanced Certificate Properties
Tehnical certificate details for www.mathsoc.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.mathsoc.hkusu.hku.hk
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Certificate
The complete raw certificate details for www.mathsoc.hkusu.hku.hk in PEM and ASN.1 format.
Certificate (PEM)
-----BEGIN CERTIFICATE----- MIIFaDCCBFCgAwIBAgISBLO8ZqSEQ9wPfqIcfN9Av2DiMA0GCSqGSIb3DQEBCwUA MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD ExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBYMzAeFw0xOTA5MjQyMzIxNTNaFw0x OTEyMjMyMzIxNTNaMCMxITAfBgNVBAMTGHd3dy5tYXRoc29jLmhrdXN1LmhrdS5o azCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAMm6AzbFdlBif0MvuNm2 TBktbEBJoZUMa0cWL7FvlzFfm0boB7tNc3gEcJDp5qMeCctf90d/Z2irw98z2LyQ Nv6xTMli0NYSDAxRXtsl0WoUWC5RYz2avBySEzidJQ7Yar9G+1JC1iZGMPg87pOI TBlpYPF+dLsc+LN2YxNRJxibQvE+HZkzJBDhudh8O/Qm8xOdWEdMVdPrRWnF9XdG 8K3R2W5W0KPuT/wQgAd4KJ0XH1OFRtmjlW5p6+PRQGApkgMH+D6q/vK+rkoTBLGj AQWD1JlvBeMelrwdevS+mjmxNCFhk6iUUUa1MFCP/kyY6Tt8fcNACkZGMM5mISBr CnsCAwEAAaOCAm0wggJpMA4GA1UdDwEB/wQEAwIFoDAdBgNVHSUEFjAUBggrBgEF BQcDAQYIKwYBBQUHAwIwDAYDVR0TAQH/BAIwADAdBgNVHQ4EFgQUJxuOnV9RyzUZ oACPmC5uoIdpddAwHwYDVR0jBBgwFoAUqEpqYwR93brm0Tm3pkVl7/Oo7KEwbwYI KwYBBQUHAQEEYzBhMC4GCCsGAQUFBzABhiJodHRwOi8vb2NzcC5pbnQteDMubGV0 c2VuY3J5cHQub3JnMC8GCCsGAQUFBzAChiNodHRwOi8vY2VydC5pbnQteDMubGV0 c2VuY3J5cHQub3JnLzAjBgNVHREEHDAaghh3d3cubWF0aHNvYy5oa3VzdS5oa3Uu aGswTAYDVR0gBEUwQzAIBgZngQwBAgEwNwYLKwYBBAGC3xMBAQEwKDAmBggrBgEF BQcCARYaaHR0cDovL2Nwcy5sZXRzZW5jcnlwdC5vcmcwggEEBgorBgEEAdZ5AgQC BIH1BIHyAPAAdgDiaUuuJujpQAnohhu2O4PUPuf+dIj7pI8okwGd3fHb/gAAAW1l y7kyAAAEAwBHMEUCICiuWk1gzskL3FkZ/WS5T7X5ye8BpUX1OYvMb7HGOPXoAiEA 33O0is7VX7HtocXxCwaIi2Hx+rhLRJ82C1VRARUdDX8AdgBj8tvN6DvMLM8LcoQn V2szpI1hd4+9daY4scdoVEvYjQAAAW1ly7kkAAAEAwBHMEUCIQDHQvuPrQyy2g1j flUG4vaVVZPGFpRExfdlUEpEFJwmJQIgWEvyuPuT6x5l+NFvk1uOE4K/Pa9fe66f J5df/BZ4rkgwDQYJKoZIhvcNAQELBQADggEBABZkOL6SBecH+JQWEHt1oJcp2s0Q j+OpaQUrG5dLwCu6+VPPStdvLP9dOouPa4WoCS6GoVIuEWohZe/41me/pTrbjw83 R+42+KiVXKMz9tfRXozSf3fsSEl8lgso0Yp8sDCQ4gVAUFcWQmH3eHLwCNxzT83U jDXXqqJOxzoj1o4KcHS9fAT1LAJU7DZNV52mjcdSJ2N66KpvixvA+Dnjpv5F3gV4 4vts45wbcRL6Eg6nKHUhUaxdxA65MKZzZwgrxznMUrITzuhpDGz852OYQ8dCd57z WJAgZAX9L4MmwhP/uouDWXrwYeuYOol7dw04lY1Ttu6OE7BZTpCc3FzUeMY= -----END CERTIFICATE-----
Public Key (PEM)
-----BEGIN PUBLIC KEY----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAyboDNsV2UGJ/Qy+42bZM GS1sQEmhlQxrRxYvsW+XMV+bRugHu01zeARwkOnmox4Jy1/3R39naKvD3zPYvJA2 /rFMyWLQ1hIMDFFe2yXRahRYLlFjPZq8HJITOJ0lDthqv0b7UkLWJkYw+Dzuk4hM GWlg8X50uxz4s3ZjE1EnGJtC8T4dmTMkEOG52Hw79CbzE51YR0xV0+tFacX1d0bw rdHZblbQo+5P/BCAB3gonRcfU4VG2aOVbmnr49FAYCmSAwf4Pqr+8r6uShMEsaMB BYPUmW8F4x6WvB169L6aObE0IWGTqJRRRrUwUI/+TJjpO3x9w0AKRkYwzmYhIGsK ewIDAQAB -----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 409610115220170400266230334351259331420386 . . . . . . . . [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 2019-09-24 23:21:53 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-12-23 23:21:53 +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.mathsoc.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 25465625507481546539516684805562086246403681366317211527037550587257487245381995065639503051591571293509456020266609517068707670114773286884174344578445818744803692849887856935339852665566386029793389208692660603367637600890606402074577522632566574543848720405820031134903290926466670376680684570311317055985377308377922180727829842022780668699724848442128077422950584446229048684180557570013119369852796318094288624651683105100644785160959147473133672147912239458686845649899906140988080599823409623094787902337088061976141451435720502961343124315572298748538990685360095872381055024190641557873209062670434380221051 . . . . . . . . . . . . . . . . . . . . [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) 271b8e9d5f51cb3519a0008f982e6ea0876975d0 . . . . . . . . . . . . . . . . [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 'www.mathsoc.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 (245 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (242 bytes) 00f0007600e2694bae26e8e94009e8861bb63b83d43ee7fe7488fba48f2893019dddf1dbfe0000016d65cbb9320000040300473045022028ae5a4d60cec90bdc5919fd64b94fb5f9c9ef01a545f5398bcc6fb1c638f5e8022100df73b48aced55fb1eda1c5f10b06888b61f1fab84b449f360b555101151d0d7f00760063f2dbcde83bcc2ccf0b728427576b33a48d61778fbd75a638b1c768544bd88d0000016d65cbb9240000040300473045022100c742fb8fad0cb2da0d637e5506e2f6955593c6169444c5f765504a44149c26250220584bf2b8fb93eb1e65f8d16f935b8e1382bf3daf5f7bae9f27975ffc1678ae48 . . . . [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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