login.alumni.hku.hk
Issued by Let's Encrypt Authority X3
About this certificate
This digital certificate with serial number 03:bb:f2:97:0b:5a:b6:10:e8:32:b8:ac:f3:7e:49:98:35:b0 was issued on by Let's Encrypt.
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=login.alumni.hku.hk
Let's Encrypt
Organization:
Let's Encrypt
Country:
US
This certificate has expire since
Certificate Details
Serial Number (hex): 03:bb:f2:97:0b:5a:b6:10:e8:32:b8:ac:f3:7e:49:98:35:b0Serial Number (int): 325292117851595207985314811702451488961968
Serial Number lenght: 138 bits, 18 octets
SubjectKeyId: 40:14:d2:bf:ef:f5:4e:03:0e:1a:bc:e7:81:95:2d:b7:33:b5:0a:0b
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1
Fingerprint (sha1): ed:08:12:dd:02:dc:3f:2f:eb:37:95:6a:b9:a4:b9:ea:bc:5a:73:b7
Fingerprint (sha256): 02:77:01:f9:99:e1:86:fa:ff:55:a5:b2:c6:5f:4f:13:8b:22:e4:c6:54:ac:ca:a1:c4:70:fa:bf:a2:66:d4:39
Issuing Certificate URL: http://cert.int-x3.letsencrypt.org/
Revocation information
OCSP Server: http://ocsp.int-x3.letsencrypt.orgCheck the revocation status for certificate login.alumni.hku.hk
1
DNS Names
0
Email Addresses
0
IP Addresses
Advanced Certificate Properties
Tehnical certificate details for login.alumni.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
login.alumni.hku.hk
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Certificate
The complete raw certificate details for login.alumni.hku.hk in PEM and ASN.1 format.
Certificate (PEM)
-----BEGIN CERTIFICATE----- MIIFXjCCBEagAwIBAgISA7vylwtathDoMris835JmDWwMA0GCSqGSIb3DQEBCwUA MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD ExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBYMzAeFw0xOTExMTAxNDE4MDBaFw0y MDAyMDgxNDE4MDBaMB4xHDAaBgNVBAMTE2xvZ2luLmFsdW1uaS5oa3UuaGswggEi MA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQCa+mlrpGUMniVTzuaZa6Ui7MQs lxJ8GkIH1G2PLCs6qOzQ6+USHxrGx9VpgXfQoKb8YYAqs1xnx3iHJnQC5ljqAsBE BarVSZhSbon8gRQyxFs2nmG+fJYVuizjtCDfXnyq8zI68Oq21ZWHxbhvE1eb5BCV dJsLQyILsP8IDdtVScvkrf/6ZbWjOvAZ31O47OF0zjfzKNIKArajF1E5ejhA+/Rl fkHHVteB5LBlSqdtz/PmoTFqmnNH4naGCOF/ZrG2UglN18NvCIFlzS05sAOtChl9 FnU9n4YV9tkX/yrttotj8x7ufLVpj3H0aPW6V5c/+c+jhkrL3rHgRvFgIM9TAgMB AAGjggJoMIICZDAOBgNVHQ8BAf8EBAMCBaAwHQYDVR0lBBYwFAYIKwYBBQUHAwEG CCsGAQUFBwMCMAwGA1UdEwEB/wQCMAAwHQYDVR0OBBYEFEAU0r/v9U4DDhq854GV LbcztQoLMB8GA1UdIwQYMBaAFKhKamMEfd265tE5t6ZFZe/zqOyhMG8GCCsGAQUF BwEBBGMwYTAuBggrBgEFBQcwAYYiaHR0cDovL29jc3AuaW50LXgzLmxldHNlbmNy eXB0Lm9yZzAvBggrBgEFBQcwAoYjaHR0cDovL2NlcnQuaW50LXgzLmxldHNlbmNy eXB0Lm9yZy8wHgYDVR0RBBcwFYITbG9naW4uYWx1bW5pLmhrdS5oazBMBgNVHSAE RTBDMAgGBmeBDAECATA3BgsrBgEEAYLfEwEBATAoMCYGCCsGAQUFBwIBFhpodHRw Oi8vY3BzLmxldHNlbmNyeXB0Lm9yZzCCAQQGCisGAQQB1nkCBAIEgfUEgfIA8AB2 ALIeBcyLos2KIE6HZvkruYolIGdr2vpw57JJUy3vi5BeAAABblXkrHYAAAQDAEcw RQIhAM59+FQK/FYnLxC86LeoUMgQQ23NacWVrItc63mrrJPbAiAQ+h41/5FghwHI dkLC/kFf9P567fY09JilOjOLXA7hAwB2AG9Tdqwx8DEZ2JkApFEV/3cVHBHZAsEA KQaNsgiaN9kTAAABblXkrKkAAAQDAEcwRQIgc3nhIomTJpsQWQUdF8//DqeZuvEK S1LvawycNKwG4BQCIQDmPDm5FZffjSsUCsGOuwPyJk212dNQ3EuvZbnCAG6wcTAN BgkqhkiG9w0BAQsFAAOCAQEAYJb1SfYFa40N7lkI3vy+5FbChOKKykx604+hD0IW MQ8uKZqicsS+3kAEQcJWQXmp2IZvPW8xASupnBpw/JvADp6Y5nmRlR0SpWtdjVTL PazmTD5DzEfDBlaap3MlNHUvpuehUaCz/n91hJpS8GzDu6ZB4cKEiagSKuH2Sjd/ KbXmEwg59KUmhoAP5Nnfcuh9KD60amHNngoFsoSu2g+mydwtRtmkS4Zxr3JwatlE 7REOYEHjEXxIHO5v4rYsTYvOuNbFmvj9a1nwJk6zdyWed2lYm7GFTySNO650oTtN vMpl/wqd+e29x1Ri9KRFGBJtLjDI6q/O/wuo5QB0SfGz8g== -----END CERTIFICATE-----
Public Key (PEM)
-----BEGIN PUBLIC KEY----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAmvppa6RlDJ4lU87mmWul IuzELJcSfBpCB9RtjywrOqjs0OvlEh8axsfVaYF30KCm/GGAKrNcZ8d4hyZ0AuZY 6gLARAWq1UmYUm6J/IEUMsRbNp5hvnyWFbos47Qg3158qvMyOvDqttWVh8W4bxNX m+QQlXSbC0MiC7D/CA3bVUnL5K3/+mW1ozrwGd9TuOzhdM438yjSCgK2oxdROXo4 QPv0ZX5Bx1bXgeSwZUqnbc/z5qExappzR+J2hgjhf2axtlIJTdfDbwiBZc0tObAD rQoZfRZ1PZ+GFfbZF/8q7baLY/Me7ny1aY9x9Gj1uleXP/nPo4ZKy96x4EbxYCDP UwIDAQAB -----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 325292117851595207985314811702451488961968 . . . . . . . . [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 2019-11-10 14:18:00 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-02-08 14:18:00 +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 'login.alumni.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 19564181624993059756055145785588685565965946197254329507274835564118951543212735927176007893202012964990759184922812576248905108595005506300050147076351576101306327324345841075740887757753611226155287526162312108512224042082010205979399279340162176558567660349959699053053071159861669979282988303338886510212549517744108024266388791262033954717732347200759586217636047351716576847660907380618090953592858658065304908446096481964673156613822299523306718586387083875717355450318760365124560540512377174372097193508497162614618868191179824994923559998263112385809027599340698357429068970016554880918608277543982137921363 . . . . . . . . . . . . . . . . . . . . [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) 4014d2bfeff54e030e1abce781952db733b50a0b . . . . . . . . . . . . . . . . [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 (23 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'login.alumni.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) 00f0007600b21e05cc8ba2cd8a204e8766f92bb98a2520676bdafa70e7b249532def8b905e0000016e55e4ac760000040300473045022100ce7df8540afc56272f10bce8b7a850c810436dcd69c595ac8b5ceb79abac93db022010fa1e35ff91608701c87642c2fe415ff4fe7aedf634f498a53a338b5c0ee1030076006f5376ac31f03119d89900a45115ff77151c11d902c10029068db2089a37d9130000016e55e4aca9000004030047304502207379e1228993269b1059051d17cfff0ea799baf10a4b52ef6b0c9c34ac06e014022100e63c39b91597df8d2b140ac18ebb03f2264db5d9d350dc4baf65b9c2006eb071 . . . . [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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