mail02.tto.hku.hk
Issued by Let's Encrypt Authority X3
About this certificate
This digital certificate with serial number 04:04:ca:0c:db:8b:de:5b:40:c7:4b:48:d9:85:e9:2e:bd:aa was issued on by Let's Encrypt.
With 4 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=mail02.tto.hku.hk
Let's Encrypt
Organization:
Let's Encrypt
Country:
US
This certificate has expire since
Certificate Details
Serial Number (hex): 04:04:ca:0c:db:8b:de:5b:40:c7:4b:48:d9:85:e9:2e:bd:aaSerial Number (int): 350078844010364829644143478937698570255786
Serial Number lenght: 139 bits, 18 octets
SubjectKeyId: 01:fb:70:f8:54:ad:18:d4:28:62:6a:27:8a:ff:b7:26:cd:59:27:f6
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1
Fingerprint (sha1): b9:5f:60:af:88:cb:4e:d6:36:1a:e0:83:1e:57:8e:0f:cb:c0:ee:d0
Fingerprint (sha256): 00:36:fb:e2:fc:df:53:c4:61:33:05:26:b5:89:df:6d:d6:aa:25:97:6f:1e:0a:44:f5:9f:0c:9d:9b:67:cf:e9
Issuing Certificate URL: http://cert.int-x3.letsencrypt.org/
Revocation information
OCSP Server: http://ocsp.int-x3.letsencrypt.orgCheck the revocation status for certificate mail02.tto.hku.hk
4
DNS Names
0
Email Addresses
0
IP Addresses
Advanced Certificate Properties
Tehnical certificate details for mail02.tto.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
mail02.tto.hku.hk
mail02.versitech.hku.hk
webmail.tto.hku.hk
webmail.versitech.hku.hk
mail02.versitech.hku.hk
webmail.tto.hku.hk
webmail.versitech.hku.hk
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Certificate
The complete raw certificate details for mail02.tto.hku.hk in PEM and ASN.1 format.
Certificate (PEM)
-----BEGIN CERTIFICATE----- MIIFoTCCBImgAwIBAgISBATKDNuL3ltAx0tI2YXpLr2qMA0GCSqGSIb3DQEBCwUA MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD ExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBYMzAeFw0xOTA5MTAwMDM0NTNaFw0x OTEyMDkwMDM0NTNaMBwxGjAYBgNVBAMTEW1haWwwMi50dG8uaGt1LmhrMIIBIjAN BgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA64xhsnyY903BPkZ5AVBqy6MJfrxZ rS7gCPgoyFFxdE4Yku/33Yro/G1yha6tuRQU+m/1t+OEseHm7TwZsAulgZJe+CFO 4tExyYpcCr9JgOdoD4Qh3nAs/TuNYinxaz603qDLrK9o5V9h5aR/nxVMX0emrwOI PyQ/3XTFO7vuC5go/67+Q6iNdY58fOdu+YDOKb6FV779WdtCfpTk1n/2++dWDNKR ggKsT5ADQYfKhYIaALQh+j9hiZE5ftzMfn3D4FT7w8e7PFjmGe2BBJtQZpj2kyqS PoBq533P5PT0PjseIaLZ8CG/8Ba0VcG9/2ihisTRJQna0Wymk/bOUrfvbQIDAQAB o4ICrTCCAqkwDgYDVR0PAQH/BAQDAgWgMB0GA1UdJQQWMBQGCCsGAQUFBwMBBggr BgEFBQcDAjAMBgNVHRMBAf8EAjAAMB0GA1UdDgQWBBQB+3D4VK0Y1ChiaieK/7cm zVkn9jAfBgNVHSMEGDAWgBSoSmpjBH3duubRObemRWXv86jsoTBvBggrBgEFBQcB AQRjMGEwLgYIKwYBBQUHMAGGImh0dHA6Ly9vY3NwLmludC14My5sZXRzZW5jcnlw dC5vcmcwLwYIKwYBBQUHMAKGI2h0dHA6Ly9jZXJ0LmludC14My5sZXRzZW5jcnlw dC5vcmcvMGMGA1UdEQRcMFqCEW1haWwwMi50dG8uaGt1LmhrghdtYWlsMDIudmVy c2l0ZWNoLmhrdS5oa4ISd2VibWFpbC50dG8uaGt1Lmhrghh3ZWJtYWlsLnZlcnNp dGVjaC5oa3UuaGswTAYDVR0gBEUwQzAIBgZngQwBAgEwNwYLKwYBBAGC3xMBAQEw KDAmBggrBgEFBQcCARYaaHR0cDovL2Nwcy5sZXRzZW5jcnlwdC5vcmcwggEEBgor BgEEAdZ5AgQCBIH1BIHyAPAAdgDiaUuuJujpQAnohhu2O4PUPuf+dIj7pI8okwGd 3fHb/gAAAW0Yzy2HAAAEAwBHMEUCIEmBdipRz9Hm1kXKF3bf/rhzuxXkFDUghrd8 tH0WDaK5AiEA0H4YGQV6ekVCFVBmQW5q8wKp4reeV64UNVxSSdKjZagAdgBj8tvN 6DvMLM8LcoQnV2szpI1hd4+9daY4scdoVEvYjQAAAW0Yzy9rAAAEAwBHMEUCIQCO ZagfurLd6LZb7+6fzFhWlUiiKAkb+CK+7KbYdaoZ7QIgSCuGDYQx/5r+PzZ7/fD7 jWbNwHEfd3Pj2AHDX72c08gwDQYJKoZIhvcNAQELBQADggEBAFbQttD/CGsMZHl3 GyZE2xrQGBxczBbLjeC/j8JIcz97JdPurwu7hiN/JwJdftdgUFymES3QAOiE18xI yA6LYnk054S6xyvIiPfu9pnnfxKxZF+PNCIFzcDN/E5Dkk60QGJyBJVnR79YtSpZ 4fRmKX8srSeuHuCrY5trozq8Vfth5yPY8mhULZK9zE6CbKGhzDCDA0fsZ7HhuSA0 O8lCv2kiKJ3Edj/WuLP8idpNoLrMlB6fjHhoI8z1XftiEzFqDkiFc60hZGI3nXtC Ym0hJnHHm8uUgBIjppThuvG/r0DgUWrcncWaNXOQa+z02SQVdVgiGGmlGBDK4dI1 zzyuu58= -----END CERTIFICATE-----
Public Key (PEM)
-----BEGIN PUBLIC KEY----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA64xhsnyY903BPkZ5AVBq y6MJfrxZrS7gCPgoyFFxdE4Yku/33Yro/G1yha6tuRQU+m/1t+OEseHm7TwZsAul gZJe+CFO4tExyYpcCr9JgOdoD4Qh3nAs/TuNYinxaz603qDLrK9o5V9h5aR/nxVM X0emrwOIPyQ/3XTFO7vuC5go/67+Q6iNdY58fOdu+YDOKb6FV779WdtCfpTk1n/2 ++dWDNKRggKsT5ADQYfKhYIaALQh+j9hiZE5ftzMfn3D4FT7w8e7PFjmGe2BBJtQ Zpj2kyqSPoBq533P5PT0PjseIaLZ8CG/8Ba0VcG9/2ihisTRJQna0Wymk/bOUrfv bQIDAQAB -----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 350078844010364829644143478937698570255786 . . . . . . . . [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 2019-09-10 00:34:53 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-12-09 00:34:53 +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 'mail02.tto.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 29735226428691285100024646140130676312855255226637152475464733189932818636319717333212387252992412205457057985033259032105347070985433549602221631305197752962505131170496131274630527210132707502169767381866131030840390453852118816798976412806308048405283273012267375974208577025615288818305589593233147222163797118754662380031661716825383477068935021653671876514699312361409947554434841778947327728812268093516413861314267864003398508793129113347511239383874721018400330727368942349033778097654113641448179344128645315755540880085602570038984969925763671637978520966844612154309024496545127561992822962753465319157613 . . . . . . . . . . . . . . . . . . . . [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) 01fb70f854ad18d428626a278affb726cd5927f6 . . . . . . . . . . . . . . . . [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 (92 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'mail02.tto.hku.hk' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'mail02.versitech.hku.hk' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'webmail.tto.hku.hk' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'webmail.versitech.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) 00f0007600e2694bae26e8e94009e8861bb63b83d43ee7fe7488fba48f2893019dddf1dbfe0000016d18cf2d87000004030047304502204981762a51cfd1e6d645ca1776dffeb873bb15e414352086b77cb47d160da2b9022100d07e1819057a7a4542155066416e6af302a9e2b79e57ae14355c5249d2a365a800760063f2dbcde83bcc2ccf0b728427576b33a48d61778fbd75a638b1c768544bd88d0000016d18cf2f6b00000403004730450221008e65a81fbab2dde8b65befee9fcc58569548a228091bf822beeca6d875aa19ed0220482b860d8431ff9afe3f367bfdf0fb8d66cdc0711f7773e3d801c35fbd9cd3c8 . . . . [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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