www.a-star.edu.sg
Issued by R3
About this certificate
This digital certificate with serial number 04:cf:cd:53:d9:d1:e0:28:00:84:cd:a2:e9:6a:96:27:28:6e 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:
- 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.a-star.edu.sg
Let's Encrypt
Organization:
Let's Encrypt
Country:
US
This certificate has expire since
Certificate Details
Serial Number (hex): 04:cf:cd:53:d9:d1:e0:28:00:84:cd:a2:e9:6a:96:27:28:6eSerial Number (int): 419160520797361357627628872541322676217966
Serial Number lenght: 139 bits, 18 octets
SubjectKeyId: 63:13:55:5b:d0:a8:5f:ce:00:2d:50:77:ee:35:20:8c:da:54:11:d6
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6
Fingerprint (sha1): be:56:bf:a8:b2:74:0a:ff:63:a3:b7:c6:00:52:51:df:b0:22:98:80
Fingerprint (sha256): 03:d8:9c:d3:5b:c6:0e:ef:64:c6:93:57:6f:68:df:bf:5a:c3:50:8e:80:e0:30:22:8f:20:cf:3e:62:26:09:d8
Issuing Certificate URL: http://r3.i.lencr.org/
Revocation information
OCSP Server: http://r3.o.lencr.orgCheck the revocation status for certificate www.a-star.edu.sg
1
DNS Names
0
Email Addresses
0
IP Addresses
Advanced Certificate Properties
Tehnical certificate details for www.a-star.edu.sg
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.a-star.edu.sg
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Certificate
The complete raw certificate details for www.a-star.edu.sg in PEM and ASN.1 format.
Certificate (PEM)
-----BEGIN CERTIFICATE----- MIIE7jCCA9agAwIBAgISBM/NU9nR4CgAhM2i6WqWJyhuMA0GCSqGSIb3DQEBCwUA MDIxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MQswCQYDVQQD EwJSMzAeFw0yMzEyMTEwNzU3NTFaFw0yNDAzMTAwNzU3NTBaMBwxGjAYBgNVBAMT EXd3dy5hLXN0YXIuZWR1LnNnMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKC AQEAsvyf0HLJxZ+tShpgmn76yKecFBBA7CFQxVa/wW0NDIfkJCxU6fnzemRbcbB3 odRPCYTTv6E20fHhDHWfMmsgnxLaRqKV8aRqJgtNZJMgOnYNDz1jRePlk2AW3rJv LRVjhsLvRqyEbUIhgxh0z8Ol3sZ4d84pW4rA9Z/KHBto9TTmz+ncDVeMT8Qdh5Ap rUWzIuoHUBDxN0Ns1ZEThQWFMjydQ82rsqWPVnWH/e3RDbyOmhb9v9cYTARkh8zD to1mziBdCF7VwfTw6X1mvll1+TXaLopUP1G4PsDIEix8LtPDlf0PUPxUEE93stmz c5C3AAq1dA4xndts+7W6gQMsOQIDAQABo4ICEjCCAg4wDgYDVR0PAQH/BAQDAgWg MB0GA1UdJQQWMBQGCCsGAQUFBwMBBggrBgEFBQcDAjAMBgNVHRMBAf8EAjAAMB0G A1UdDgQWBBRjE1Vb0KhfzgAtUHfuNSCM2lQR1jAfBgNVHSMEGDAWgBQULrMXt1hW y65QCUDmH6+dixTCxjBVBggrBgEFBQcBAQRJMEcwIQYIKwYBBQUHMAGGFWh0dHA6 Ly9yMy5vLmxlbmNyLm9yZzAiBggrBgEFBQcwAoYWaHR0cDovL3IzLmkubGVuY3Iu b3JnLzAcBgNVHREEFTATghF3d3cuYS1zdGFyLmVkdS5zZzATBgNVHSAEDDAKMAgG BmeBDAECATCCAQMGCisGAQQB1nkCBAIEgfQEgfEA7wB2ADtTd3U+LbmAToswWwb+ QDtn2E/D9Me9AA0tcm/h+tQXAAABjFgY1lwAAAQDAEcwRQIgbB1S3+iVgIJLWtc6 qfEyvMMKWjC+Sbz1BuCPsT0KaZYCIQDX09KyCCkUSZbaAhTfXYzrwOiyIcILDYM7 A/Lj03kI2wB1AKLiv9Ye3i8vB6DWTm03p9xlQ7DGtS6i2reK+Jpt9RfYAAABjFgY 1mgAAAQDAEYwRAIgRCk36Exuq9FEvCkFv5xR5bZa3wo2L9ECZz1c/kfg2QsCICzx x9Dsu6zbRT2zP4M8ROwMwxJZ0J1NcDZcYDOtWUyNMA0GCSqGSIb3DQEBCwUAA4IB AQBgPs1lh0QQnPzCQ8EHmY8EDSOPt9YmBSAkzJbKyHqy5NqYBdGXIuUE/S31/elg pnxWnj0GzgrwuSxWnhl5RA2X+jUkfX7AREE7lYU19WAtm8FbbqkeInQwqEk+jpBN aCaWww+eVQnDaXW1kyXFsgklyK5EAZj4K9GwXgmHQHEA5aNXtxWFwwnK1iYUq/wr QYd74fnXKapsOLrmIwPT8jlrULbznTiwAV4gYxLDO4Apy4ZfJBZ2Mq0o04Qxtd/g uU9j0sq9Kj8eVFDNbH5uktbn4chn4L3xi6QtInVgFT+Qo9fpdUGoY57TXCqbQgl0 pAIlmK6lgZv9svCLrYzb80cC -----END CERTIFICATE-----
Public Key (PEM)
-----BEGIN PUBLIC KEY----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAsvyf0HLJxZ+tShpgmn76 yKecFBBA7CFQxVa/wW0NDIfkJCxU6fnzemRbcbB3odRPCYTTv6E20fHhDHWfMmsg nxLaRqKV8aRqJgtNZJMgOnYNDz1jRePlk2AW3rJvLRVjhsLvRqyEbUIhgxh0z8Ol 3sZ4d84pW4rA9Z/KHBto9TTmz+ncDVeMT8Qdh5AprUWzIuoHUBDxN0Ns1ZEThQWF MjydQ82rsqWPVnWH/e3RDbyOmhb9v9cYTARkh8zDto1mziBdCF7VwfTw6X1mvll1 +TXaLopUP1G4PsDIEix8LtPDlf0PUPxUEE93stmzc5C3AAq1dA4xndts+7W6gQMs OQIDAQAB -----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 419160520797361357627628872541322676217966 . . . . . . . . [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 2023-12-11 07:57:51 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-03-10 07:57:50 +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.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 (2160 bits) . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 22594991956599315363310676654261361213783186346632423563047064085941463820517401913517232799419884919950957969713505571222611965528396738913908743695461217676235223332783973164314253949422407786279724084158974928342459905884945197864518558495344962412230194837731226651352165979566850395807790929752616309625644580140979558995345951175138677852018166341561651241484661008119799095554426224832087951999261359014240586397210463618399607588723451922896742743488440877720717850601027068955668249813751113655847452361310197589702292491381670068563286927163565112810804424098587944963499919140257301005054252792822783749177 . . . . . . . . . . . . . . . . . . . . [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) 6313555bd0a85fce002d5077ee35208cda5411d6 . . . . . . . . . . . . . . . . [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 'www.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 (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 (244 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (241 bytes) 00ef0076003b5377753e2db9804e8b305b06fe403b67d84fc3f4c7bd000d2d726fe1fad4170000018c5818d65c000004030047304502206c1d52dfe89580824b5ad73aa9f132bcc30a5a30be49bcf506e08fb13d0a6996022100d7d3d2b20829144996da0214df5d8cebc0e8b221c20b0d833b03f2e3d37908db007500a2e2bfd61ede2f2f07a0d64e6d37a7dc6543b0c6b52ea2dab78af89a6df517d80000018c5818d66800000403004630440220442937e84c6eabd144bc2905bf9c51e5b65adf0a362fd102673d5cfe47e0d90b02202cf1c7d0ecbbacdb453db33f833c44ec0cc31259d09d4d70365c6033ad594c8d . . . . [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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