o365.singyin.edu.hk
Issued by Let's Encrypt Authority X3
About this certificate
This digital certificate with serial number 03:b6:bf:d5:2c:31:94:58:41:56:a6:d5:d9:9c:51:5c:ac:93 was issued on by Let's Encrypt.
With 3 subject alternative names this certificate can be used to secure multiple fqdn's. 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=o365.singyin.edu.hk
Let's Encrypt
Organization:
Let's Encrypt
Country:
US
This certificate has expire since
Certificate Details
Serial Number (hex): 03:b6:bf:d5:2c:31:94:58:41:56:a6:d5:d9:9c:51:5c:ac:93Serial Number (int): 323523237977671440139565780688624521358483
Serial Number lenght: 138 bits, 18 octets
SubjectKeyId: d0:93:95:13:64:ac:0a:75:dd:d6:d8:89:b0:8b:9b:ae:e6:ac:6b:12
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1
Fingerprint (sha1): dc:64:c5:24:b2:f9:9d:87:f3:ad:88:5b:6c:69:35:26:df:cc:1b:29
Fingerprint (sha256): 29:e1:0e:eb:18:1c:14:07:89:42:9d:4d:d6:61:c5:6b:a1:2b:2b:b1:40:c5:34:97:a1:4b:76:0f:5e:b8:70:aa
Issuing Certificate URL: http://cert.int-x3.letsencrypt.org/
Revocation information
OCSP Server: http://ocsp.int-x3.letsencrypt.orgCheck the revocation status for certificate o365.singyin.edu.hk
3
DNS Names
0
Email Addresses
0
IP Addresses
Advanced Certificate Properties
Tehnical certificate details for o365.singyin.edu.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
judge.singyin.edu.hk
o365.singyin.edu.hk
pastpaper2.singyin.edu.hk
o365.singyin.edu.hk
pastpaper2.singyin.edu.hk
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Certificate
The complete raw certificate details for o365.singyin.edu.hk in PEM and ASN.1 format.
Certificate (PEM)
-----BEGIN CERTIFICATE----- MIIFjzCCBHegAwIBAgISA7a/1SwxlFhBVqbV2ZxRXKyTMA0GCSqGSIb3DQEBCwUA MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD ExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBYMzAeFw0xOTEyMTMxNjA0MTVaFw0y MDAzMTIxNjA0MTVaMB4xHDAaBgNVBAMTE28zNjUuc2luZ3lpbi5lZHUuaGswggEi MA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQDimUV4VzND5HXnRTsvhur16jo2 8LkhWavCaH4ot9+Xm612HkAR4cJKTPposLlGMn9p9wntzLBWAyANLySPaqKUlZ02 BmRx2FOnrWLLLAHgI1v64BHyUeX5bCtYvdC52wSPy8VrMznb3NR1dUyNFmbksEZN qJAFqkpNG1Trw4OCqr+JOAtX1XI6Yt2EjS5Tea+oCOjTjaUVBda5VKU8Sviu6pLP gWvgN62zj+kY/HEVMfEz65eG0w6Al7og+/Tui2O7c3cvwGz6PYMZECE3KX0dmpnY Y5DEfl6W3+ByYy2Ig2XhcVoiNE6lLMT8MOMtqRcFlP18BwGpUP+waZ+NwBEPAgMB AAGjggKZMIIClTAOBgNVHQ8BAf8EBAMCBaAwHQYDVR0lBBYwFAYIKwYBBQUHAwEG CCsGAQUFBwMCMAwGA1UdEwEB/wQCMAAwHQYDVR0OBBYEFNCTlRNkrAp13dbYibCL m67mrGsSMB8GA1UdIwQYMBaAFKhKamMEfd265tE5t6ZFZe/zqOyhMG8GCCsGAQUF BwEBBGMwYTAuBggrBgEFBQcwAYYiaHR0cDovL29jc3AuaW50LXgzLmxldHNlbmNy eXB0Lm9yZzAvBggrBgEFBQcwAoYjaHR0cDovL2NlcnQuaW50LXgzLmxldHNlbmNy eXB0Lm9yZy8wTwYDVR0RBEgwRoIUanVkZ2Uuc2luZ3lpbi5lZHUuaGuCE28zNjUu c2luZ3lpbi5lZHUuaGuCGXBhc3RwYXBlcjIuc2luZ3lpbi5lZHUuaGswTAYDVR0g BEUwQzAIBgZngQwBAgEwNwYLKwYBBAGC3xMBAQEwKDAmBggrBgEFBQcCARYaaHR0 cDovL2Nwcy5sZXRzZW5jcnlwdC5vcmcwggEEBgorBgEEAdZ5AgQCBIH1BIHyAPAA dgBep3P531bA57U2SH3QSeAyepGaDIShEhKEGHWWgXFFWAAAAW8AN9F5AAAEAwBH MEUCIQDK17yE8/3MGzwvB34TDSI1HG/ew1O91zzhf0Hwf4DdowIgTy5fy4Jt6e45 CcG8muPG7EdAL5h+dgoG12mgqLUMu8EAdgAHt1wb5X1o//Gwxh0jFce65ld8V5S3 au68YToaadOiHAAAAW8AN9GkAAAEAwBHMEUCIQCbxIreIwlvMLwB4bDmaL0ilAio MRhjFTH6C3uaJYOJAwIgJ9+e9HDulbLvcB0FRZ7rSagmoIhY3YJ5uW0MaB5XMMAw DQYJKoZIhvcNAQELBQADggEBAEd6o5MOvgLIgUyO4exyCYiykjHC5OX89RF46fai PGwkeNyDbydENMn2GUzilPiBLa9CMU6Lyv5vsGC1ju1YXCcXP+OvBRVKwdBtpBvh UB2BuRZWDNz5Ir1WXXrnOUpUlC7kSd6YyEgTZe2bm0eQE6gaXjEU5pSFfENxzp8g 8dz2+6XEC3A0xPdWgv0xphMyKdeGxB4oawwjL+RQ9bxj0lkfPnaFKi4klwAsWPg2 u6qAABzjCxaueeJLdvkRvnqvuwPRXUuLWHEcYS/Xr/w++7tw7/Xnd1kqQG4bP38V mXrR0C+hi+PHzNfY0x1OA+pbQaef6RVT2d6bDW1zS8zYZYo= -----END CERTIFICATE-----
Public Key (PEM)
-----BEGIN PUBLIC KEY----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA4plFeFczQ+R150U7L4bq 9eo6NvC5IVmrwmh+KLffl5utdh5AEeHCSkz6aLC5RjJ/afcJ7cywVgMgDS8kj2qi lJWdNgZkcdhTp61iyywB4CNb+uAR8lHl+WwrWL3QudsEj8vFazM529zUdXVMjRZm 5LBGTaiQBapKTRtU68ODgqq/iTgLV9VyOmLdhI0uU3mvqAjo042lFQXWuVSlPEr4 ruqSz4Fr4Dets4/pGPxxFTHxM+uXhtMOgJe6IPv07otju3N3L8Bs+j2DGRAhNyl9 HZqZ2GOQxH5elt/gcmMtiINl4XFaIjROpSzE/DDjLakXBZT9fAcBqVD/sGmfjcAR DwIDAQAB -----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 323523237977671440139565780688624521358483 . . . . . . . . [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 2019-12-13 16:04:15 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-03-12 16:04:15 +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 'o365.singyin.edu.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 28605437850584369991882735325677811477563698160311312381797733155708295573881693424885631258642432377931927072799434707859549799144983648086037751674238442572534535488715550190885316023139327752650625681579022684462538775496590038082369101846208195769770081692975869007258165781499783960755319483062162539832366396866051295316564298252959704780388411106294495706215365268369173607555201833250862535891184753205259539568592791097780034155769218880795256768688937037760973148129373729524185950591037323787061277118913189076565033920000459146318301251086564247039086559298860350032478398781566346369339919326536450183439 . . . . . . . . . . . . . . . . . . . . [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) d093951364ac0a75ddd6d889b08b9baee6ac6b12 . . . . . . . . . . . . . . . . [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 (72 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'judge.singyin.edu.hk' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'o365.singyin.edu.hk' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'pastpaper2.singyin.edu.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) 00f00076005ea773f9df56c0e7b536487dd049e0327a919a0c84a1121284187596817145580000016f0037d1790000040300473045022100cad7bc84f3fdcc1b3c2f077e130d22351c6fdec353bdd73ce17f41f07f80dda302204f2e5fcb826de9ee3909c1bc9ae3c6ec47402f987e760a06d769a0a8b50cbbc100760007b75c1be57d68fff1b0c61d2315c7bae6577c5794b76aeebc613a1a69d3a21c0000016f0037d1a400000403004730450221009bc48ade23096f30bc01e1b0e668bd229408a83118631531fa0b7b9a25838903022027df9ef470ee95b2ef701d05459eeb49a826a08858dd8279b96d0c681e5730c0 . . . . [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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