dpo.a-star.edu.sg
Issued by R3
About this certificate
This digital certificate with serial number 04:3d:79:08:54:1e:ad:16:61:c0:31:ed:b9:7f:bf:60:74:84 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=dpo.a-star.edu.sg
Let's Encrypt
Organization:
Let's Encrypt
Country:
US
This certificate has expire since
Certificate Details
Serial Number (hex): 04:3d:79:08:54:1e:ad:16:61:c0:31:ed:b9:7f:bf:60:74:84Serial Number (int): 369367247941235895503854129355983203366020
Serial Number lenght: 139 bits, 18 octets
SubjectKeyId: d7:dd:a2:92:bc:91:ea:f4:ad:2f:34:f0:89:61:6f:b8:ab:d8:13:7c
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6
Fingerprint (sha1): 3d:54:b9:aa:9b:31:36:12:0c:21:b1:6e:e7:df:46:7f:31:26:d3:f7
Fingerprint (sha256): 04:19:12:93:61:77:70:9e:4a:5e:be:c9:a1:5b:ad:69:54:70:af:ca:b6:0d:89:83:17:eb:e3:27:dd:e6:74:15
Issuing Certificate URL: http://r3.i.lencr.org/
Revocation information
OCSP Server: http://r3.o.lencr.orgCheck the revocation status for certificate dpo.a-star.edu.sg
1
DNS Names
0
Email Addresses
0
IP Addresses
Advanced Certificate Properties
Tehnical certificate details for dpo.a-star.edu.sg
Public Key Algorithm
RSA
Key Size
4096
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
dpo.a-star.edu.sg
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Certificate
The complete raw certificate details for dpo.a-star.edu.sg in PEM and ASN.1 format.
Certificate (PEM)
-----BEGIN CERTIFICATE----- MIIGKTCCBRGgAwIBAgISBD15CFQerRZhwDHtuX+/YHSEMA0GCSqGSIb3DQEBCwUA MDIxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MQswCQYDVQQD EwJSMzAeFw0yMzAxMDQxOTA4MDRaFw0yMzA0MDQxOTA4MDNaMBwxGjAYBgNVBAMT EWRwby5hLXN0YXIuZWR1LnNnMIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKC AgEAu+FyI0fqbC7Y2bPrI1nn5ptA/8M7Q4TerGBLvDgn2yxC6AoryrcgbOfxx0Bt FdHvanaTK5lPwKvnJQjOLJwJC7omQZGyZCBSNOo69o+R5L7eeate2R6Os0K0Qp32 Kr2faOouOURUny8Vcu6O4hkZ3qLinNdz6CUJIW/xMHAdLU4RMYr3FQ54kYlEhY2g g5zGTKYuPM+ZVewZqow2PupxuqQRO5v3j3xBUXNaofsM8+NMzLssWiaV56+LaXP3 n/NW/rHCMLYGE+onVoe3PDUE/3xMCygLpEL/IXA0fjyEx/IIkhcCCz8LQRItSZph /GRLMV00KUOCXKLeCpyeNYzH8AiJkcBnHFqmYdNBEflEqmezwqY4HFCxmt57FDC/ LFQGY0TDHsHhZuFiLTHr54vpkNVPb6oHTK7guGyi+hgomW1/OziZAw3GV+7Kaub0 2q+A7PF0sGKgLAPds8BI3kZt55DS72j1xd/fRaOig01P2Midxv15brS4nnNxLL/6 gZr9rmfaC6xpmL6V7xTMB3kGhuNNWEjiVbEP+2wNdNMQtXp0X2JaPCCYMk9grAaJ vEqqFhn6FSBJefhcN+lM13hgNDc+KKUng2ud8mlvwEtB9sC3eR+wkOf3TYfzNVVW EKSXHshb19vZVkJiLF4dESA8ZS9IWRufgyhJogxchfJ1/vECAwEAAaOCAk0wggJJ MA4GA1UdDwEB/wQEAwIFoDAdBgNVHSUEFjAUBggrBgEFBQcDAQYIKwYBBQUHAwIw DAYDVR0TAQH/BAIwADAdBgNVHQ4EFgQU192ikryR6vStLzTwiWFvuKvYE3wwHwYD VR0jBBgwFoAUFC6zF7dYVsuuUAlA5h+vnYsUwsYwVQYIKwYBBQUHAQEESTBHMCEG CCsGAQUFBzABhhVodHRwOi8vcjMuby5sZW5jci5vcmcwIgYIKwYBBQUHMAKGFmh0 dHA6Ly9yMy5pLmxlbmNyLm9yZy8wHAYDVR0RBBUwE4IRZHBvLmEtc3Rhci5lZHUu c2cwTAYDVR0gBEUwQzAIBgZngQwBAgEwNwYLKwYBBAGC3xMBAQEwKDAmBggrBgEF BQcCARYaaHR0cDovL2Nwcy5sZXRzZW5jcnlwdC5vcmcwggEFBgorBgEEAdZ5AgQC BIH2BIHzAPEAdwB6MoxU2LcttiDqOOBSHumEFnAyE4VNO9IrwTpXo1LrUgAAAYV+ ZeRFAAAEAwBIMEYCIQCE2ZQ6V8OdgTPtwY0fYoHU9rb8Mu31ohVOZWuR3mDqDAIh ALKshQO/FsSJ2FhU1nODVBFADGisaYatWrUU53k8tGa+AHYArfe++nz/EMiLnT2c Hj4YarRnKV3PsQwkyoWGNOvcgooAAAGFfmXkXgAABAMARzBFAiEAzl3/T1x22+qY gPyd/m+2ejG/jINmHwWvDF9N3rXUuYICIEMSQDyyC3T55j3lZ2Si/m7hpRQL5Vzo 7Tm1rBIiuuJ6MA0GCSqGSIb3DQEBCwUAA4IBAQBMENwQA2ZmUnY5edfVZwKBzXA2 NbKTofEnpJdYeGmT1pwqMFPcQm4yVD9P20S7obGiV4WXbkPo5z/ZZ8zD5zFEkBnV V+RDLyFyxGzd1lGrhfLk4QbmeaeksU1vdnEzQxQgb103AgKyN0j3f0FL/HORvAcT IKZVKJuH2G6h7FOOCLy61b8yHtfB1BY1tbipF6GrloS3kBH3HrX7Jfb5aOqvLIlR m0l1aHSMRTTGaIXshCPYF+bBSMR9bvmeBC0jMrZw4obua//PgERlx7lWOqd65ruN AiV1YDsibu6G2zueYCsQ5ES4RaEvOgPVMnO7TjsLBYHhKfmKf4Cp4y+Obss3 -----END CERTIFICATE-----
Public Key (PEM)
-----BEGIN PUBLIC KEY----- MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAu+FyI0fqbC7Y2bPrI1nn 5ptA/8M7Q4TerGBLvDgn2yxC6AoryrcgbOfxx0BtFdHvanaTK5lPwKvnJQjOLJwJ C7omQZGyZCBSNOo69o+R5L7eeate2R6Os0K0Qp32Kr2faOouOURUny8Vcu6O4hkZ 3qLinNdz6CUJIW/xMHAdLU4RMYr3FQ54kYlEhY2gg5zGTKYuPM+ZVewZqow2Pupx uqQRO5v3j3xBUXNaofsM8+NMzLssWiaV56+LaXP3n/NW/rHCMLYGE+onVoe3PDUE /3xMCygLpEL/IXA0fjyEx/IIkhcCCz8LQRItSZph/GRLMV00KUOCXKLeCpyeNYzH 8AiJkcBnHFqmYdNBEflEqmezwqY4HFCxmt57FDC/LFQGY0TDHsHhZuFiLTHr54vp kNVPb6oHTK7guGyi+hgomW1/OziZAw3GV+7Kaub02q+A7PF0sGKgLAPds8BI3kZt 55DS72j1xd/fRaOig01P2Midxv15brS4nnNxLL/6gZr9rmfaC6xpmL6V7xTMB3kG huNNWEjiVbEP+2wNdNMQtXp0X2JaPCCYMk9grAaJvEqqFhn6FSBJefhcN+lM13hg NDc+KKUng2ud8mlvwEtB9sC3eR+wkOf3TYfzNVVWEKSXHshb19vZVkJiLF4dESA8 ZS9IWRufgyhJogxchfJ1/vECAwEAAQ== -----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 369367247941235895503854129355983203366020 . . . . . . . . [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 2023-01-04 19:08:04 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2023-04-04 19:08:03 +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 'dpo.a-star.edu.sg' . . . . . . . . [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 (4208 bits) . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 766486170516857479600365585627718761711703982496987978218404332090808758497960115913925378633823627233743068591563132247933383394476256354899955691651927633871239867071271858562485573939342937312775534381614923774129138136200770159832243395902591191030602042189136286684430666212732637208469913476694073485136318579446827827898217811054778772782950646547877524384413701980373983381449547351058542897554128282873040740957252533501705086256336700771489637116672888882611379473930713552655524938817390668054915101638804747283387813257385606048452440348486524193284439491580770669788256241926944711185195602046911752006702476363956500943332918502102679668051728224603771397599837163625632137921247948135264829916978781864072686316066617048978257767335848327834687179527733128006907392311381783416331480516711082129662795004114961753601693052440038773609467705081423310149853315699063464491026677311831181931729215741496020948124606929744266551700494036045514987280304974653007367865361995734564214343904300929495055231552391272342582489126099695317989946362505163511302413498660928180854433155772077902075264565349459478676623347291717222677682089260047508616873973359586096649081495653904882703341720427430793844179251270623102785421041 . . . . . . . . . . . . . . . . . . . . [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) d7dda292bc91eaf4ad2f34f089616fb8abd8137c . . . . . . . . . . . . . . . . [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 (21 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'dpo.a-star.edu.sg' . . . . . . . . . . . . . . . . [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 (246 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (243 bytes) 00f10077007a328c54d8b72db620ea38e0521ee98416703213854d3bd22bc13a57a352eb52000001857e65e445000004030048304602210084d9943a57c39d8133edc18d1f6281d4f6b6fc32edf5a2154e656b91de60ea0c022100b2ac8503bf16c489d85854d673835411400c68ac6986ad5ab514e7793cb466be007600adf7befa7cff10c88b9d3d9c1e3e186ab467295dcfb10c24ca858634ebdc828a000001857e65e45e0000040300473045022100ce5dff4f5c76dbea9880fc9dfe6fb67a31bf8c83661f05af0c5f4ddeb5d4b98202204312403cb20b74f9e63de56764a2fe6ee1a5140be55ce8ed39b5ac1222bae27a . . . . [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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