mentoring.kcl.ac.uk
Issued by Let's Encrypt Authority X3
About this certificate
This digital certificate with serial number 04:a0:ce:c8:48:75:4c:5a:07:88:91:9f:06:4d:a4:f9:53:ad 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=mentoring.kcl.ac.uk
Let's Encrypt
Organization:
Let's Encrypt
Country:
US
This certificate has expire since
Certificate Details
Serial Number (hex): 04:a0:ce:c8:48:75:4c:5a:07:88:91:9f:06:4d:a4:f9:53:adSerial Number (int): 403169183330521356552714626804092061176749
Serial Number lenght: 139 bits, 18 octets
SubjectKeyId: 4b:be:c4:2a:f5:0e:6e:1d:c0:bd:c2:77:9c:e8:c5:52:2d:52:98:ad
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1
Fingerprint (sha1): c0:4e:5e:7f:87:14:33:e9:d1:5b:8a:27:a1:d4:01:2b:6c:7c:d8:9b
Fingerprint (sha256): 00:0c:23:82:73:9a:e1:15:68:df:6d:70:2d:68:77:66:5f:ff:5f:19:0d:95:5b:0d:73:28:ac:b1:1d:ba:43:e7
Issuing Certificate URL: http://cert.int-x3.letsencrypt.org/
Revocation information
OCSP Server: http://ocsp.int-x3.letsencrypt.orgCheck the revocation status for certificate mentoring.kcl.ac.uk
1
DNS Names
0
Email Addresses
0
IP Addresses
Advanced Certificate Properties
Tehnical certificate details for mentoring.kcl.ac.uk
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
mentoring.kcl.ac.uk
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Certificate
The complete raw certificate details for mentoring.kcl.ac.uk in PEM and ASN.1 format.
Certificate (PEM)
-----BEGIN CERTIFICATE----- MIIFXTCCBEWgAwIBAgISBKDOyEh1TFoHiJGfBk2k+VOtMA0GCSqGSIb3DQEBCwUA MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD ExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBYMzAeFw0xOTAyMDkyMzA1NTBaFw0x OTA1MTAyMzA1NTBaMB4xHDAaBgNVBAMTE21lbnRvcmluZy5rY2wuYWMudWswggEi MA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQClvJ9FbfIFYWrw7eN/wBHjmXJ7 33oA7c6m7uyAhEsWVp7HKK7wmeU48NPpAuhPt24lxEWhzlTtbyo25yQ53KcsbOs5 rbB9Tdrh+3L93GyVXliJl/1M2bbx4ZZEsmG5RWJn0IXesxlT/i2dBcABbPnJ7DhY Ir4HbiQfh7WMPe2Bn4NEaX2tfKh+iElwc/n31Z5bFT3Uv9iPEXL4JfPiyypjGObs 6DYXPv5QLnEusp7kmIPo9ouD4yk3idHr2xWXBffZYgl02dCMWM+3TIxJDjOWAo1e HnHFPP28WcZO+2up3MCU6+Azkgxpvn6e3NtzgXxDeseC/orFHK1r1i0yuTvRAgMB AAGjggJnMIICYzAOBgNVHQ8BAf8EBAMCBaAwHQYDVR0lBBYwFAYIKwYBBQUHAwEG CCsGAQUFBwMCMAwGA1UdEwEB/wQCMAAwHQYDVR0OBBYEFEu+xCr1Dm4dwL3Cd5zo xVItUpitMB8GA1UdIwQYMBaAFKhKamMEfd265tE5t6ZFZe/zqOyhMG8GCCsGAQUF BwEBBGMwYTAuBggrBgEFBQcwAYYiaHR0cDovL29jc3AuaW50LXgzLmxldHNlbmNy eXB0Lm9yZzAvBggrBgEFBQcwAoYjaHR0cDovL2NlcnQuaW50LXgzLmxldHNlbmNy eXB0Lm9yZy8wHgYDVR0RBBcwFYITbWVudG9yaW5nLmtjbC5hYy51azBMBgNVHSAE RTBDMAgGBmeBDAECATA3BgsrBgEEAYLfEwEBATAoMCYGCCsGAQUFBwIBFhpodHRw Oi8vY3BzLmxldHNlbmNyeXB0Lm9yZzCCAQMGCisGAQQB1nkCBAIEgfQEgfEA7wB1 AOJpS64m6OlACeiGG7Y7g9Q+5/50iPukjyiTAZ3d8dv+AAABaNS5doYAAAQDAEYw RAIgQ5IcCzNzmXv1C9ZUfFvVUEL1x8FOQPIDdKrDTIU70wACIBV6FdaRtTw3bNJl DoqS6MQdpIVt9MTMPrhpzU1LwbgcAHYAKTxRllTIOWW6qlD8WAfUt2+/WHopctyk wwz05UVH9HgAAAFo1Ll2eAAABAMARzBFAiEAi+hWNw8s/jVLDccpLeOLIVZAqu5z SZ05Nt4jOyBM+70CIDw80IaXdHOn38oMkpCDLJZKwpP5t2GLgiSwHbM5Lj7yMA0G CSqGSIb3DQEBCwUAA4IBAQCNpcIZilVZw+sjmEjPI4N2audkW62aj/v6OgfKgFZs YzYhX6ww0Oo7NptJ+iQTNCLfTfhkmkQEEOHjsmja6RIi+zcbAeuIDkrZeomftUtw tCGpv6abbbjAFrrZuQHyic5J9Ck+DqZA5F6Hf3q+N5EqWaKgJB7u9/L2MSC72EtQ LM+T9IJj2EeMgX5AGE76OtZmjkTxoPHdgKFycbBCdBns1R0+eEHiG58ZomYmORSa nvAuFh0Bf22nmrUBYRw2rxIosNHZn2/CDL7ueh1RhCwC/IZJNQCR+Rt6lOOirjYi 1fdpL1yL0ung8xr3tzB64QSmAUJ4aDaC2b7ZxlfA4I83 -----END CERTIFICATE-----
Public Key (PEM)
-----BEGIN PUBLIC KEY----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEApbyfRW3yBWFq8O3jf8AR 45lye996AO3Opu7sgIRLFlaexyiu8JnlOPDT6QLoT7duJcRFoc5U7W8qNuckOdyn LGzrOa2wfU3a4fty/dxslV5YiZf9TNm28eGWRLJhuUViZ9CF3rMZU/4tnQXAAWz5 yew4WCK+B24kH4e1jD3tgZ+DRGl9rXyofohJcHP599WeWxU91L/YjxFy+CXz4ssq Yxjm7Og2Fz7+UC5xLrKe5JiD6PaLg+MpN4nR69sVlwX32WIJdNnQjFjPt0yMSQ4z lgKNXh5xxTz9vFnGTvtrqdzAlOvgM5IMab5+ntzbc4F8Q3rHgv6KxRyta9YtMrk7 0QIDAQAB -----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 403169183330521356552714626804092061176749 . . . . . . . . [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 2019-02-09 23:05:50 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-05-10 23:05:50 +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 'mentoring.kcl.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 (2160 bits) . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 20922333369766582893874881622491101824022168399611053805436924576762026669647614865874160966447517375159921682457493127944726302377315567844605851988740841573908342869183916352023013223442203863914227984171817853571851076977236934602286035689786179573740372398841493607749045027953824247477386750246006742953213411388063557579712585380896094179118665392150731823434740721699509489601944695895725215123957481110769496173441142641858977872701018120708960387379663340953194353645965789996518367068758487784254001347623550443856938860105494612340528605483028301718276637070821812124806286860638008481348411520247668489169 . . . . . . . . . . . . . . . . . . . . [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) 4bbec42af50e6e1dc0bdc2779ce8c5522d5298ad . . . . . . . . . . . . . . . . [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 (23 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'mentoring.kcl.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 (244 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (241 bytes) 00ef007500e2694bae26e8e94009e8861bb63b83d43ee7fe7488fba48f2893019dddf1dbfe00000168d4b976860000040300463044022043921c0b3373997bf50bd6547c5bd55042f5c7c14e40f20374aac34c853bd3000220157a15d691b53c376cd2650e8a92e8c41da4856df4c4cc3eb869cd4d4bc1b81c007600293c519654c83965baaa50fc5807d4b76fbf587a2972dca4c30cf4e54547f47800000168d4b9767800000403004730450221008be856370f2cfe354b0dc7292de38b215640aaee73499d3936de233b204cfbbd02203c3cd086977473a7dfca0c9290832c964ac293f9b7618b8224b01db3392e3ef2 . . . . [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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