learning.hku.hk

Issued by R3

About this certificate

This digital certificate with serial number 04:b0:3c:4b:de:64:e4:f3:3d:3e:08:11:05:93:8d:8b:fb:d0 was issued on by Let's Encrypt.

This certificate is currently not expired, we haven't checked the revocation status of this certificate but you can do this simply on revocationcheck.com. 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:
  • DV certificate contains a subject common name, this is not recommended. If certificate policy 2.23.140.1.2.1 (CA/B BR domain validated) is included, only country and/or common name is allowed in SubjectDN. (BRs: 7.1.2.7.2)
  • Subscriber certificates use of Subject Key Identifier is NOT RECOMMENDED (BRs v2: 7.1.2.7.6)
  • Subscriber Certificate: commonName is NOT RECOMMENDED. (BRs: 7.1.2.7.1)

Certificate Subject

CN=learning.hku.hk

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate will expire on

Certificate Details

Serial Number (hex): 04:b0:3c:4b:de:64:e4:f3:3d:3e:08:11:05:93:8d:8b:fb:d0
Serial Number (int): 408418987917826246123015232874742800972752
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: 96:ff:07:46:4a:a8:36:bc:90:22:6a:1d:28:f0:00:ae:22:18:05:19
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): 80:d1:ae:87:3b:0d:9b:c3:f8:97:e6:ea:bf:14:db:79:92:dc:40:c7
Fingerprint (sha256): 02:c2:51:85:f5:7a:90:79:2d:38:ed:c1:3c:9d:c5:a8:3b:98:87:76:7f:39:02:52:2b:b8:df:d9:4e:41:61:e8

Issuing Certificate URL: http://r3.i.lencr.org/

Revocation information

OCSP Server: http://r3.o.lencr.org

Check the revocation status for certificate learning.hku.hk

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for learning.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

learning.hku.hk

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Certificate

The complete raw certificate details for learning.hku.hk in PEM and ASN.1 format.

Certificate (PEM)

-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA6v+YY4AAS4IBwPX5wQ5T
A+iSmkrClFrzuluHqGWdrVo5QdAwVX6e1VmKpN8gdj7EdvtKrI7jpVNOL3BfNwa4
UdzU+VknKghLoDCBcdS8RX6DBnWcoEDTgNqzIPE6Oo7qM22BGgxzIlJmfb7u8lQk
+BO3rSC4Z2cb+XqmUhK3bd4SckzJlR4JSYN2sQPY41BQ2EGJVB4GIn2kAT38Q4tG
AyZY8di4EPLVTO5xi7RVCiYeMnggvMlT/A9Z/VQsz89kAnQIXdoTzFHXynppqTyL
ncNv+GQKKVfYUhsD2QkKU9Ztr60z9xsICyXwY4B2dt8vX8qRS6ZLIAXXoR1XjPBv
HQIDAQAB
-----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 408418987917826246123015232874742800972752
 . . . . . . . . [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 'R3'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-04-13 18:48:39 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-07-12 18:48:38 +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 'learning.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 29665802086359171088127558083546417907370386654187076314290016469736662102743988014081153366782467750517837104463596410532255191582596774674065408429819625047237462403448314838189052996593123772416277460607314436028773924236250599832297332460025657808061169291799392595829635822963254304788301609283472022810726401438748759085200488058133448375720910581698001334776029951707901498591533202661170627931661173429399767978135103285119188202651385718634419958106722594268118500026754890559307009093238453555219776853245546224793417163725872873409213707987014874777660609745943078528353685544073991480046862395570004193053
 . . . . . . . . . . . . . . . . . . . . [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)
							96ff07464aa836bc90226a1d28f000ae22180519
 . . . . . . . . . . . . . . . . [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 142eb317b75856cbae500940e61faf9d8b14c2c6
 . . . . . . . . . . . . . . . . [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 (73 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://r3.o.lencr.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://r3.i.lencr.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 (19 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'learning.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 (12 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 1.3.6.1.4.1.11129.2.4.2
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (246 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (243 bytes)
							00f10077003f174b4fd7224758941d651c84be0d12ed90377f1f856aebc1bf2885ecf8646e0000018ed90139af0000040300483046022100ac0dd68d23dea7712bafe97766dbe0ed4a4b15a514ff95d827266e1132ff60560221008d0c2fbc6af6a619151ba23486852e817ebd409138a5dc2953938caf3325a6cf00760076ff883f0ab6fb9551c261ccf587ba34b4a4cdbb29dc68420a9fe6674c5a3a740000018ed90139e50000040300473045022100ffcc924d576b6cd0ee4c2d85b3bdeb60e448a10d1b80fb65e5bbc299ee72eeca02206e08e780bc368b35e5593e96899714f9bc75bd6183250a86dea46882ef03e506
 . . . . [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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