ntusecurity.ntu.ac.uk
Issued by Let's Encrypt Authority X3
About this certificate
This digital certificate with serial number 03:76:9b:a7:b7:f5:69:06:77:95:e9:f6:7a:7c:e9:1d:4a:81 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=ntusecurity.ntu.ac.uk
Let's Encrypt
Organization:
Let's Encrypt
Country:
US
This certificate has expire since
Certificate Details
Serial Number (hex): 03:76:9b:a7:b7:f5:69:06:77:95:e9:f6:7a:7c:e9:1d:4a:81Serial Number (int): 301697078275997876933627601209935989131905
Serial Number lenght: 138 bits, 18 octets
SubjectKeyId: f6:9f:c5:da:b0:19:19:ab:af:80:80:7d:22:32:06:56:1c:da:74:68
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1
Fingerprint (sha1): 06:2d:7d:1e:dd:1c:0f:3c:04:f8:56:40:24:2f:61:28:dd:3c:50:07
Fingerprint (sha256): 10:ea:b2:3c:74:bb:c5:35:b8:83:79:d0:be:94:5d:ba:bd:58:56:2f:82:56:a2:23:82:37:af:61:ad:25:24:a8
Issuing Certificate URL: http://cert.int-x3.letsencrypt.org/
Revocation information
OCSP Server: http://ocsp.int-x3.letsencrypt.orgCheck the revocation status for certificate ntusecurity.ntu.ac.uk
1
DNS Names
0
Email Addresses
0
IP Addresses
Advanced Certificate Properties
Tehnical certificate details for ntusecurity.ntu.ac.uk
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
ntusecurity.ntu.ac.uk
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selfservice.ntu.ac.uk
ntuanywhere.ntu.ac.uk
brackenhurst.elearn.ntu.ac.uk
smartcard.ntu.ac.uk
city-fe-pool-ext.exrestore.ntu.ac.uk
www2.ntu.ac.uk
wireless.ntu.ac.uk
elearn.ntu.ac.uk
outlook.su.ntu.ac.uk
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office365.ntu.ac.uk
www2.ntu.ac.uk
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thomasmore.ads.ntu.ac.uk
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Certificate
The complete raw certificate details for ntusecurity.ntu.ac.uk in PEM and ASN.1 format.
Certificate (PEM)
-----BEGIN CERTIFICATE----- MIIGYzCCBUugAwIBAgISA3abp7f1aQZ3len2enzpHUqBMA0GCSqGSIb3DQEBCwUA MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD ExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBYMzAeFw0xOTA2MTEyMzM3MjZaFw0x OTA5MDkyMzM3MjZaMCAxHjAcBgNVBAMTFW50dXNlY3VyaXR5Lm50dS5hYy51azCC AiIwDQYJKoZIhvcNAQEBBQADggIPADCCAgoCggIBAMl56d2c2lV47ucp/fVX0dW2 PBgOmV6RJdCA4ojsNVlTa8zH3G8yP5PhbaaVOdUnhqo+8ptiZGASXn5UiGSeWNQz S6RQzPkq3ei/EXq1KgzSvgzShYC5m2ANZb1Px2NmdFTIxBmhvAh54isxm+/j5TMQ cjX0pxYdLwrAHZ7SqWRMAUYC8J0aGV+6ER5C7lSrgpDNdeN2IlnFPC+Vp+uAlQ/D 6dVTb4/Fd8WSr2OOR+sWRAD7SNVMxbPHnuj2bLIUnw/SPx15TVUkpn0T5dniq5BE KKm9THEP47iZYTZrxq/qn3zNgfSGRWrmChUAr0sNPDW13Dq1VRHyXFPW+i0sb6cq VwCx5jKArDbwMeY1rJLN990OsedOxrlXEX7H38kAps6jjLqDkZWX+Ip/WIq49fsH DTCRt8tBj4/sfXytLCnV9gZNaNJKU1dvAxR2cKc62xjFbhYrwQlcS1wMhT8i2l8s HG+3gs65voe4bw2i6721LzLqwNPlhSq2EOdboe2iiTCbKLXGYy0GrqZgkadYu86G 81BFbtk5PWnD9LpfqPHBYQ41A54F9vB3w39BvD0S1SCfqAaEiNZOTkNTQFKrvj55 EIwQ5e504YmhkUq4MnQKPCO9BIr1bSu5qm680iqUUerfqRD3AL//pc0BwUYELS8O CfLZWlT7Y+8yGYYk1inbAgMBAAGjggJrMIICZzAOBgNVHQ8BAf8EBAMCBaAwHQYD VR0lBBYwFAYIKwYBBQUHAwEGCCsGAQUFBwMCMAwGA1UdEwEB/wQCMAAwHQYDVR0O BBYEFPafxdqwGRmrr4CAfSIyBlYc2nRoMB8GA1UdIwQYMBaAFKhKamMEfd265tE5 t6ZFZe/zqOyhMG8GCCsGAQUFBwEBBGMwYTAuBggrBgEFBQcwAYYiaHR0cDovL29j c3AuaW50LXgzLmxldHNlbmNyeXB0Lm9yZzAvBggrBgEFBQcwAoYjaHR0cDovL2Nl cnQuaW50LXgzLmxldHNlbmNyeXB0Lm9yZy8wIAYDVR0RBBkwF4IVbnR1c2VjdXJp dHkubnR1LmFjLnVrMEwGA1UdIARFMEMwCAYGZ4EMAQIBMDcGCysGAQQBgt8TAQEB MCgwJgYIKwYBBQUHAgEWGmh0dHA6Ly9jcHMubGV0c2VuY3J5cHQub3JnMIIBBQYK KwYBBAHWeQIEAgSB9gSB8wDxAHcAb1N2rDHwMRnYmQCkURX/dxUcEdkCwQApBo2y CJo32RMAAAFrSR48vwAABAMASDBGAiEA2knpkdmfXzsiP6eAeQUEvefAuKFApgRC Y4sCwtayUxcCIQDgEy/ThGnSk7zBC63yJMNRZXapVCYnVbP+rYHdczIQEQB2AGPy 283oO8wszwtyhCdXazOkjWF3j711pjixx2hUS9iNAAABa0kePGoAAAQDAEcwRQIh AJ08zyNCDXtv4iPM2K6Ron8sornFphfzkx2Hu7Lb2jRAAiB/2a3CqreBIqbvadrE kmkQ5pY/1P64GH0GfnIbGKuLAzANBgkqhkiG9w0BAQsFAAOCAQEAWO2ixR4DEFOw yiN0gJlOBG4htNBWonk+GmSNvxHk32mTBYBoCyfKZG2xArglotplYosXPwFY1cA5 iZWt7DQ5jxKFMBdSDae3+hc72D1Hmq/mGrv/FYa3xbOro5PLhw1sZ5jvC9a9mpTI lzI2kDMd7vTYFD+Xin7J8aiU27r5ebDlqOMY5XU7Fcawd7uEL3BQ6MvSQydU69sF 2H/1805kMbo12aLoS9D2NR/lelBPS0h0bOfIarbEQv9UvPjcDoLJepdkhAgZsH5H WWjryNRy+fpC84J31pLZQeSmtwf0BD1Hv7vIrlwnyo/waao1PO2cqRhBwzKI0Qtf YwEAjwbXMg== -----END CERTIFICATE-----
Public Key (PEM)
-----BEGIN PUBLIC KEY----- MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAyXnp3ZzaVXju5yn99VfR 1bY8GA6ZXpEl0IDiiOw1WVNrzMfcbzI/k+FtppU51SeGqj7ym2JkYBJeflSIZJ5Y 1DNLpFDM+Srd6L8RerUqDNK+DNKFgLmbYA1lvU/HY2Z0VMjEGaG8CHniKzGb7+Pl MxByNfSnFh0vCsAdntKpZEwBRgLwnRoZX7oRHkLuVKuCkM1143YiWcU8L5Wn64CV D8Pp1VNvj8V3xZKvY45H6xZEAPtI1UzFs8ee6PZsshSfD9I/HXlNVSSmfRPl2eKr kEQoqb1McQ/juJlhNmvGr+qffM2B9IZFauYKFQCvSw08NbXcOrVVEfJcU9b6LSxv pypXALHmMoCsNvAx5jWsks333Q6x507GuVcRfsffyQCmzqOMuoORlZf4in9Yirj1 +wcNMJG3y0GPj+x9fK0sKdX2Bk1o0kpTV28DFHZwpzrbGMVuFivBCVxLXAyFPyLa Xywcb7eCzrm+h7hvDaLrvbUvMurA0+WFKrYQ51uh7aKJMJsotcZjLQaupmCRp1i7 zobzUEVu2Tk9acP0ul+o8cFhDjUDngX28HfDf0G8PRLVIJ+oBoSI1k5OQ1NAUqu+ PnkQjBDl7nThiaGRSrgydAo8I70EivVtK7mqbrzSKpRR6t+pEPcAv/+lzQHBRgQt Lw4J8tlaVPtj7zIZhiTWKdsCAwEAAQ== -----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 301697078275997876933627601209935989131905 . . . . . . . . [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 'Let's Encrypt Authority X3' . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-06-11 23:37:26 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-09-09 23:37:26 +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 'ntusecurity.ntu.ac.uk' . . . . . . . . [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 821951285176977603953579517335901594548846750375245147093911234953277080679067337326528852055629798570426060231771042000067352045360261006132669925007039350165797362278247674297269768099858975647840593419779680230871484803861382512516900396993667295700813876226826710258272810757240721354881983542006850730809297486135531347349567754088082215629960057286604187398764030327136109572284613172361954895640663723761558751192012908996113216603921242496386361159980125991771187527781300795769263352356448510873789479072657276720103880773671178126182061467176376349803695505406463988346009656242596862032858313030877556991852241340089276666574992205305155827735362527458731427087890536113052060178428292448536720845167963362853023572789272502480219890009372726256464328542639486723949053295677095421908849540672973579853691376215033910336190988298594856293544892321569941165955257171735160474747071259852500207376145208286868801385411137616770551845888050532834137577963406215783974857479182398474056134834068982292026494997696513294785032459564059976812062285967267556825817209876102111090655495759213020265541761324931156048019557025747510400256081471955465075693804386657957069897874841942393981513188977319188314597759841119725537339867 . . . . . . . . . . . . . . . . . . . . [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) f69fc5dab01919abaf80807d223206561cda7468 . . . . . . . . . . . . . . . . [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 a84a6a63047dddbae6d139b7a64565eff3a8eca1 . . . . . . . . . . . . . . . . [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 (99 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://ocsp.int-x3.letsencrypt.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://cert.int-x3.letsencrypt.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 (25 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'ntusecurity.ntu.ac.uk' . . . . . . . . . . . . . . . . [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) 00f10077006f5376ac31f03119d89900a45115ff77151c11d902c10029068db2089a37d9130000016b491e3cbf0000040300483046022100da49e991d99f5f3b223fa780790504bde7c0b8a140a60442638b02c2d6b25317022100e0132fd38469d293bcc10badf224c3516576a954262755b3fead81dd7332101100760063f2dbcde83bcc2ccf0b728427576b33a48d61778fbd75a638b1c768544bd88d0000016b491e3c6a00000403004730450221009d3ccf23420d7b6fe223ccd8ae91a27f2ca2b9c5a617f3931d87bbb2dbda344002207fd9adc2aab78122a6ef69dac4926910e6963fd4feb8187d067e721b18ab8b03 . . . . [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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