ns8survey.aci.a-star.edu.sg
Issued by R3
About this certificate
This digital certificate with serial number 03:8c:01:ec:8b:ec:dc:b8:ca:23:11:80:45:af:d5:d7:a3:b8 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=ns8survey.aci.a-star.edu.sg
Let's Encrypt
Organization:
Let's Encrypt
Country:
US
This certificate has expire since
Certificate Details
Serial Number (hex): 03:8c:01:ec:8b:ec:dc:b8:ca:23:11:80:45:af:d5:d7:a3:b8Serial Number (int): 308978946612287615319962384826636751578040
Serial Number lenght: 138 bits, 18 octets
SubjectKeyId: 28:be:32:77:b3:f1:60:5d:5c:4d:f1:70:29:4e:ac:1a:69:71:f2:f0
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6
Fingerprint (sha1): 36:76:b2:75:61:aa:bc:cd:fa:8a:eb:53:cd:c0:e3:c1:1b:82:c4:f7
Fingerprint (sha256): 0f:d4:aa:c9:c4:9a:bf:03:2a:f2:7f:d3:03:3a:89:84:b9:a7:eb:af:2f:d5:c8:df:0d:d2:f8:83:45:13:72:10
Issuing Certificate URL: http://r3.i.lencr.org/
Revocation information
OCSP Server: http://r3.o.lencr.orgCheck the revocation status for certificate ns8survey.aci.a-star.edu.sg
1
DNS Names
0
Email Addresses
0
IP Addresses
Advanced Certificate Properties
Tehnical certificate details for ns8survey.aci.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
ns8survey.aci.a-star.edu.sg
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Certificate
The complete raw certificate details for ns8survey.aci.a-star.edu.sg in PEM and ASN.1 format.
Certificate (PEM)
-----BEGIN CERTIFICATE----- MIIGAjCCBOqgAwIBAgISA4wB7Ivs3LjKIxGARa/V16O4MA0GCSqGSIb3DQEBCwUA MDIxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MQswCQYDVQQD EwJSMzAeFw0yMzEyMDYwMzEwMjhaFw0yNDAzMDUwMzEwMjdaMCYxJDAiBgNVBAMT G25zOHN1cnZleS5hY2kuYS1zdGFyLmVkdS5zZzCCAiIwDQYJKoZIhvcNAQEBBQAD ggIPADCCAgoCggIBALzA0BIfzV5B0O4T8YIFZxM6ZwzJqwnj6XKy0szcLhSTkKPi kKpYASPH6W403CdhSYuGsox3vs9r4oDjO83lSdpM45OpGWFGQa20Xq9sCiJAtm8g 5qefQxrYQzbD0wNpPsfp37Z67t75SnYtVx6QzrDM7VI9RJWQv1utBaLO+x54VqKo 80Nwg+UGvbiqe4mLlV2aNcfvjuLCNCCdmfFERIZ4YfHMDimtah8lNBzSg3yHh9J5 QiXQ8eWkUoebcVLmRY8+mFPS5PAky/M4met6zXJ+/SC03CdEAxycuQFxiU5NGDoC ZQrtHhgiLrDamQVexF2mV8hmkXXI3zjeU631zgpjML6Bw6bEXxezfdd4iJZ6RN5s YL9cKw9JJ934cNh5ft+cGGkXqVWbw1qBmyet3FWyJ4ubj8b3o6W9zUCttuJseFBG P9JPCsdxM4cz90jtz7ittFVPMRGBVD5RL0VYQSbsqGhgkE9YZDERhbblluOmOrPh VUVArM99AMPu0FC8LcwtTQldU3UADsPU+vJeaCLg4KTdFf+qcZsbC1nXMsaIdfHx Cs6HEY/6/BnCQvOo6YrFErbdIGOpYRr1FRkN0H11+mXVds0XrnsuoKVXNKU4lBH2 xyPekS5fDp3ZrLC1da7OzsclISQNH3UpB6RChbj5P3p7e4BPIAWRrpnYCoURAgMB AAGjggIcMIICGDAOBgNVHQ8BAf8EBAMCBaAwHQYDVR0lBBYwFAYIKwYBBQUHAwEG CCsGAQUFBwMCMAwGA1UdEwEB/wQCMAAwHQYDVR0OBBYEFCi+Mnez8WBdXE3xcClO rBppcfLwMB8GA1UdIwQYMBaAFBQusxe3WFbLrlAJQOYfr52LFMLGMFUGCCsGAQUF BwEBBEkwRzAhBggrBgEFBQcwAYYVaHR0cDovL3IzLm8ubGVuY3Iub3JnMCIGCCsG AQUFBzAChhZodHRwOi8vcjMuaS5sZW5jci5vcmcvMCYGA1UdEQQfMB2CG25zOHN1 cnZleS5hY2kuYS1zdGFyLmVkdS5zZzATBgNVHSAEDDAKMAgGBmeBDAECATCCAQMG CisGAQQB1nkCBAIEgfQEgfEA7wB1AEiw42vapkc0D+VqAvqdMOscUgHLVt0sgdm7 v6s52IRzAAABjD1R7g4AAAQDAEYwRAIgBAWO50OLJSi5dJKf4jxN10w9Os53azdL uIVaBV+tugkCIE8wCawBO1/bj/pYHwLoFoRPnDi4zzvsUPik2AU+LqWcAHYAKdA6 G7Z0qnEc0wNbZVfBT4qni0/oOJRJ7KRT+US9JGgAAAGMPVHvIgAABAMARzBFAiEA yweblmjoOOfR/YYV+ppY5DHzYhP5a+XhXLaH4KZGL8gCIHk/Chd6/tkJlX2Xz21f PMc//xsZ4lh4F2zkML8dioV7MA0GCSqGSIb3DQEBCwUAA4IBAQCXR/FAxUfzNEjM k63vOhH4WKZGapwGPKJC6EdEKgeUGViTL2XptzUaJDnhl+XcBa/1KoDQcCYo+xnb BCWOC/gBJtqPVRTsqIWBhzZFRqacYVUyRZolglS0d79g5OWn3hAwVRvfyncAloPl +8gu5dzHlGgyWvlt037uG8nPqan218nw++BBPj3ixu16J8IAlQC6o7d3wiQZuna8 shvn79Iq7lNu2OwcTdG28CxUxbbZuspA7Ygml8mrZUNNOXHsMSuYAma22iqDaRlx V4iu3XNxc26Tfc80XToM6zavVM70/Ivh9mpY45snPAy5o6yNvUEH1TLfoPynFk9Y oW9EjoQc -----END CERTIFICATE-----
Public Key (PEM)
-----BEGIN PUBLIC KEY----- MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAvMDQEh/NXkHQ7hPxggVn EzpnDMmrCePpcrLSzNwuFJOQo+KQqlgBI8fpbjTcJ2FJi4ayjHe+z2vigOM7zeVJ 2kzjk6kZYUZBrbRer2wKIkC2byDmp59DGthDNsPTA2k+x+nftnru3vlKdi1XHpDO sMztUj1ElZC/W60Fos77HnhWoqjzQ3CD5Qa9uKp7iYuVXZo1x++O4sI0IJ2Z8URE hnhh8cwOKa1qHyU0HNKDfIeH0nlCJdDx5aRSh5txUuZFjz6YU9Lk8CTL8ziZ63rN cn79ILTcJ0QDHJy5AXGJTk0YOgJlCu0eGCIusNqZBV7EXaZXyGaRdcjfON5TrfXO CmMwvoHDpsRfF7N913iIlnpE3mxgv1wrD0kn3fhw2Hl+35wYaRepVZvDWoGbJ63c VbIni5uPxvejpb3NQK224mx4UEY/0k8Kx3EzhzP3SO3PuK20VU8xEYFUPlEvRVhB JuyoaGCQT1hkMRGFtuWW46Y6s+FVRUCsz30Aw+7QULwtzC1NCV1TdQAOw9T68l5o IuDgpN0V/6pxmxsLWdcyxoh18fEKzocRj/r8GcJC86jpisUStt0gY6lhGvUVGQ3Q fXX6ZdV2zReuey6gpVc0pTiUEfbHI96RLl8OndmssLV1rs7OxyUhJA0fdSkHpEKF uPk/ent7gE8gBZGumdgKhRECAwEAAQ== -----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 308978946612287615319962384826636751578040 . . . . . . . . [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 2023-12-06 03:10:28 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-03-05 03:10:27 +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 'ns8survey.aci.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 770045770335073129678714729082200499749746021632557582137230793099239882404843023940370222999243309779805214491738632724109511145888000922095739400464301701728870550399549503238716594135816123619683631923834866176202021371893978513749544253677826938070210568880662040820532138648755135377437601853210709182444976988765407172186022082708536262702784424340053726913666948898612811869265433093006516641293388677333514040184833179884464047362005989319136292961829436542718278362035001648763588769035261824121342312170366664511645457593332805747871906266183118936554909227392786784373833011779825342769181752892778167758955876739284542391211523256660966649483294312183991969117353967744413819122248923567453448572272515391802831993890304549049055568225147935322292585006279766441004485547833733815553968251689647114742795086360711764329746384190587780198351469776996322570626450884101105900133869327393638291364447147051619918903529213989852816161554712861566263530391808684530986212506404721730130561633764003004861977784080210802277988651486893111921250356906381099145933979923296502136072429976199708580476922093055421562568622235204875696221296790401927189440440472748674662874682324742279644818771767111810456452349295465836875253009 . . . . . . . . . . . . . . . . . . . . [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) 28be3277b3f1605d5c4df170294eac1a6971f2f0 . . . . . . . . . . . . . . . . [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 (31 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'ns8survey.aci.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) 00ef00750048b0e36bdaa647340fe56a02fa9d30eb1c5201cb56dd2c81d9bbbfab39d884730000018c3d51ee0e0000040300463044022004058ee7438b2528b974929fe23c4dd74c3d3ace776b374bb8855a055fadba0902204f3009ac013b5fdb8ffa581f02e816844f9c38b8cf3bec50f8a4d8053e2ea59c00760029d03a1bb674aa711cd3035b6557c14f8aa78b4fe8389449eca453f944bd24680000018c3d51ef220000040300473045022100cb079b9668e838e7d1fd8615fa9a58e431f36213f96be5e15cb687e0a6462fc80220793f0a177afed909957d97cf6d5f3cc73fff1b19e25878176ce430bf1d8a857b . . . . [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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