www.yca.edu.hk

Issued by R3

About this certificate

This digital certificate with serial number 03:bd:99:e8:31:e1:5d:37:af:c7:ea:e8:f6:ac:83:b8:ec:2e was issued on by Let's Encrypt.

With 2 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:
  • 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=www.yca.edu.hk

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:bd:99:e8:31:e1:5d:37:af:c7:ea:e8:f6:ac:83:b8:ec:2e
Serial Number (int): 325854802651257638314590355118808555383854
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: a2:68:b5:6d:56:eb:61:00:80:c1:c7:b7:b1:8e:91:6e:3d:e1:8c:70
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): 76:14:d9:8d:ba:2e:8f:50:6c:73:df:44:89:42:ae:28:11:d6:b9:f4
Fingerprint (sha256): 13:58:c3:3c:25:72:a7:cf:55:fb:2a:34:11:41:db:28:72:85:a6:48:bb:d2:61:11:cc:8c:72:c5:3a:0a:3a:f7

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

Revocation information

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

Check the revocation status for certificate www.yca.edu.hk

2

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for www.yca.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

www.yca.edu.hk
yca.edu.hk

Other certificates including the domain name yca.edu.hk

(limited to 100 certificates)
www.yca.edu.hk
www.netflixsubs.app
www.malaywhere.org
www.yca.edu.hk
donhackman.com
www.yca.edu.hk
one-farm.ng
www.yca.edu.hk
www.yca.edu.hk
gsm.fotc.com
studio.gotokenny.com
www.yca.edu.hk
www.yca.edu.hk
vertigocreativo.com.ar

Certificate

The complete raw certificate details for www.yca.edu.hk in PEM and ASN.1 format.

Certificate (PEM)

-----BEGIN CERTIFICATE-----
MIIE9TCCA92gAwIBAgISA72Z6DHhXTevx+ro9qyDuOwuMA0GCSqGSIb3DQEBCwUA
MDIxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MQswCQYDVQQD
EwJSMzAeFw0yNDAyMjcwMDE3MTVaFw0yNDA1MjcwMDE3MTRaMBkxFzAVBgNVBAMT
Dnd3dy55Y2EuZWR1LmhrMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA
qtW/evu3FPfS938uDg3V/AR5NQ5YUZ2HoP04uyzFBEj2i8qeg9rZRQBraxpZFMz9
N0oszdHpgb+xVe55eEpZbtDbI5lfSA2Xn1u2F7nRc2WW4uxoIIwr32abPcbunjTd
18Nfdd0qVFiGrscDQGyVOSxIM8EEsbVMEq1O2JTwmsaOQJtBIbRt4D2WACmgc3Hc
kwL8XbSPb1QqRLxpqAM3xJAC0GLr/0686ccG+nvPTtAGwmyltkMbKqSAd4X6z3QN
ucRu/Mfpy7C1YKMHrOri4frf8HLBZ2ZXiX8UNp1wEX+Ec3j2cJJcu+otjBlw5tQ2
ymTSDVMh0iylQppenJGRLQIDAQABo4ICHDCCAhgwDgYDVR0PAQH/BAQDAgWgMB0G
A1UdJQQWMBQGCCsGAQUFBwMBBggrBgEFBQcDAjAMBgNVHRMBAf8EAjAAMB0GA1Ud
DgQWBBSiaLVtVuthAIDBx7exjpFuPeGMcDAfBgNVHSMEGDAWgBQULrMXt1hWy65Q
CUDmH6+dixTCxjBVBggrBgEFBQcBAQRJMEcwIQYIKwYBBQUHMAGGFWh0dHA6Ly9y
My5vLmxlbmNyLm9yZzAiBggrBgEFBQcwAoYWaHR0cDovL3IzLmkubGVuY3Iub3Jn
LzAlBgNVHREEHjAcgg53d3cueWNhLmVkdS5oa4IKeWNhLmVkdS5oazATBgNVHSAE
DDAKMAgGBmeBDAECATCCAQQGCisGAQQB1nkCBAIEgfUEgfIA8AB2AEiw42vapkc0
D+VqAvqdMOscUgHLVt0sgdm7v6s52IRzAAABjegjLI8AAAQDAEcwRQIhAO7UMihV
uJhH4WXrgpKpoMLUtJxobQ/zNotSdefh42M+AiBUNUqeK9tBlX/zJHuyQb1REWRC
maqS8FeBmEiJtQZRUQB2AKLiv9Ye3i8vB6DWTm03p9xlQ7DGtS6i2reK+Jpt9RfY
AAABjegjLLIAAAQDAEcwRQIhAI++cSNeNE3RX262CI2CJyraddeBiV7gyZEVwxtw
O7XGAiBSqSUJeIslfsuGOc2C652I/hxkzU4126mjGIxRSuvyYTANBgkqhkiG9w0B
AQsFAAOCAQEAOEQJ1PbBoSYM2HKSxy/CkJTneOqP4VKrao36y1BiiPG/LmJrN7ba
DOsiBDD0IswdM/5xQMHAJHnq1Cx/InJBUXoy19VCrZrA9timv+TWN0HJjYwL/ZhI
jGJmm3zLlJOnhx3DPx6Q5eNcykL9XS3Sn612bRE/cDSYpEeHMu/I6RReAE2CaLoL
qxsA44VoK7ysN4mwKlEiYtZtVJd7hNqUvk2nu8BPKKUwwb6FUfNDYgASyqfkArge
Aeau/3Agf6KbU9NrjJ8iUgc/FlG7IfuETw4iH2QGfXFEKAsyA9hhXYGd0k6u2fjg
QnDux5fh70YqDel2jm2gMHT3+1kx66ujRg==
-----END CERTIFICATE-----

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAqtW/evu3FPfS938uDg3V
/AR5NQ5YUZ2HoP04uyzFBEj2i8qeg9rZRQBraxpZFMz9N0oszdHpgb+xVe55eEpZ
btDbI5lfSA2Xn1u2F7nRc2WW4uxoIIwr32abPcbunjTd18Nfdd0qVFiGrscDQGyV
OSxIM8EEsbVMEq1O2JTwmsaOQJtBIbRt4D2WACmgc3HckwL8XbSPb1QqRLxpqAM3
xJAC0GLr/0686ccG+nvPTtAGwmyltkMbKqSAd4X6z3QNucRu/Mfpy7C1YKMHrOri
4frf8HLBZ2ZXiX8UNp1wEX+Ec3j2cJJcu+otjBlw5tQ2ymTSDVMh0iylQppenJGR
LQIDAQAB
-----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 325854802651257638314590355118808555383854
 . . . . . . . . [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 2024-02-27 00:17:15 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-05-27 00:17:14 +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.yca.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 21565914896823116300160603907332009875749875286001796074917793525013809893043882040861069555343703468820591328787736286966980483863874593259825649275415264593420047156982516463980500748258319808447881459831976971797371741804794494695152672295683010451276624507587572384219304825678314201543375684752476152819509158642411588171074350279982538990675178908138259721691671983674226671371489290105689868491043464666260121833217343775614040358840032648956531025514417384014167214458579267433051603183916516491491592980162373068962075498346072323355852739647790713089257309400843851018764909009247483508585183153994687680813
 . . . . . . . . . . . . . . . . . . . . [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)
							a268b56d56eb610080c1c7b7b18e916e3de18c70
 . . . . . . . . . . . . . . . . [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 (30 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.yca.edu.hk'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'yca.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 (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 (245 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (242 bytes)
							00f000760048b0e36bdaa647340fe56a02fa9d30eb1c5201cb56dd2c81d9bbbfab39d884730000018de8232c8f0000040300473045022100eed4322855b89847e165eb8292a9a0c2d4b49c686d0ff3368b5275e7e1e3633e022054354a9e2bdb41957ff3247bb241bd5111644299aa92f05781984889b5065151007600a2e2bfd61ede2f2f07a0d64e6d37a7dc6543b0c6b52ea2dab78af89a6df517d80000018de8232cb200000403004730450221008fbe71235e344dd15f6eb6088d82272ada75d781895ee0c99115c31b703bb5c6022052a92509788b257ecb8639cd82eb9d88fe1c64cd4e35dba9a3188c514aebf261
 . . . . [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)
		00384409d4f6c1a1260cd87292c72fc29094e778ea8fe152ab6a8dfacb506288f1bf2e626b37b6da0ceb220430f422cc1d33fe7140c1c02479ead42c7f227241517a32d7d542ad9ac0f6d8a6bfe4d63741c98d8c0bfd98488c62669b7ccb9493a7871dc33f1e90e5e35cca42fd5d2dd29fad766d113f703498a4478732efc8e9145e004d8268ba0bab1b00e385682bbcac3789b02a512262d66d54977b84da94be4da7bbc04f28a530c1be8551f343620012caa7e402b81e01e6aeff70207fa29b53d36b8c9f2252073f1651bb21fb844f0e221f64067d7144280b3203d8615d819dd24eaed9f8e04270eec797e1ef462a0de9768e6da03074f7fb5931ebaba346