www.keisu.t.u-tokyo.ac.jp
Issued by Let's Encrypt Authority X3
About this certificate
This digital certificate with serial number 03:00:2a:d1:0e:d3:d2:a0:f7:99:ba:99:0e:f2:10:f7:c9:a9 was issued on by Let's Encrypt.
With 2 subject alternative names this certificate can be used to secure multiple fqdn's. 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=www.keisu.t.u-tokyo.ac.jp
Let's Encrypt
Organization:
Let's Encrypt
Country:
US
This certificate has expire since
Certificate Details
Serial Number (hex): 03:00:2a:d1:0e:d3:d2:a0:f7:99:ba:99:0e:f2:10:f7:c9:a9Serial Number (int): 261393770861883203376595122157137266461097
Serial Number lenght: 138 bits, 18 octets
SubjectKeyId: 4c:8a:3d:a4:df:f5:1e:93:e2:65:d5:f1:1e:60:43:7d:31:28:b3:05
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1
Fingerprint (sha1): 1b:f0:5a:f9:ab:7b:ae:8c:68:c2:2e:62:bd:4b:9d:d4:40:a6:bc:1d
Fingerprint (sha256): 03:f1:4e:ea:ec:44:22:13:29:f6:a8:8e:cd:ab:06:b3:22:6c:45:a0:4e:12:8f:43:a2:cf:6a:f2:f3:b3:76:df
Issuing Certificate URL: http://cert.int-x3.letsencrypt.org/
Revocation information
OCSP Server: http://ocsp.int-x3.letsencrypt.orgCheck the revocation status for certificate www.keisu.t.u-tokyo.ac.jp
2
DNS Names
0
Email Addresses
0
IP Addresses
Advanced Certificate Properties
Tehnical certificate details for www.keisu.t.u-tokyo.ac.jp
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.keisu.t.u-tokyo.ac.jp
www.www.keisu.t.u-tokyo.ac.jp
www.www.keisu.t.u-tokyo.ac.jp
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Certificate
The complete raw certificate details for www.keisu.t.u-tokyo.ac.jp in PEM and ASN.1 format.
Certificate (PEM)
-----BEGIN CERTIFICATE----- MIIGOzCCBSOgAwIBAgISAwAq0Q7T0qD3mbqZDvIQ98mpMA0GCSqGSIb3DQEBCwUA MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD ExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBYMzAeFw0xODA2MDEwMDI2MDJaFw0x ODA4MzAwMDI2MDJaMCQxIjAgBgNVBAMTGXd3dy5rZWlzdS50LnUtdG9reW8uYWMu anAwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQDmJLDJFsI2XXepjAXL B0gVRorTgYNmDO1szdnBTUYaDMo+Qb+uPHktw5JcMpwwQypDsIukSsf95ulM01JK YARSwb3BaymnY7OxyZIe5TJU72uhfOhaZcE6ZS0nc/TbqodxE1Zea/YvHKck100Z ZfbdDzt1vYC4Zch9ONIV3tcl2aUdByfw7dPZ5rOAdC2LHB+zcr6gr/CKaumFly/p QHYDcN+XPF2ftbTk0A3oFeWECzGM2oBsakvBmzfR8h066ShkOGIBKYr3a9xabqF2 o+6UuE1juRS/GT4iCkwt5uqAE8AKB1O5N83CRhHCIQfyz/mXTjOGj6GBrVJDxELD 4UfZAgMBAAGjggM/MIIDOzAOBgNVHQ8BAf8EBAMCBaAwHQYDVR0lBBYwFAYIKwYB BQUHAwEGCCsGAQUFBwMCMAwGA1UdEwEB/wQCMAAwHQYDVR0OBBYEFEyKPaTf9R6T 4mXV8R5gQ30xKLMFMB8GA1UdIwQYMBaAFKhKamMEfd265tE5t6ZFZe/zqOyhMG8G CCsGAQUFBwEBBGMwYTAuBggrBgEFBQcwAYYiaHR0cDovL29jc3AuaW50LXgzLmxl dHNlbmNyeXB0Lm9yZzAvBggrBgEFBQcwAoYjaHR0cDovL2NlcnQuaW50LXgzLmxl dHNlbmNyeXB0Lm9yZy8wQwYDVR0RBDwwOoIZd3d3LmtlaXN1LnQudS10b2t5by5h Yy5qcIIdd3d3Lnd3dy5rZWlzdS50LnUtdG9reW8uYWMuanAwgf4GA1UdIASB9jCB 8zAIBgZngQwBAgEwgeYGCysGAQQBgt8TAQEBMIHWMCYGCCsGAQUFBwIBFhpodHRw Oi8vY3BzLmxldHNlbmNyeXB0Lm9yZzCBqwYIKwYBBQUHAgIwgZ4MgZtUaGlzIENl cnRpZmljYXRlIG1heSBvbmx5IGJlIHJlbGllZCB1cG9uIGJ5IFJlbHlpbmcgUGFy dGllcyBhbmQgb25seSBpbiBhY2NvcmRhbmNlIHdpdGggdGhlIENlcnRpZmljYXRl IFBvbGljeSBmb3VuZCBhdCBodHRwczovL2xldHNlbmNyeXB0Lm9yZy9yZXBvc2l0 b3J5LzCCAQMGCisGAQQB1nkCBAIEgfQEgfEA7wB2ANt0r+7LKeyx/so+cW0s5bmq uzb3hHGDx12dTze2H79kAAABY7jzmuIAAAQDAEcwRQIgAboN3cSCKeUU905EdFSQ iqwbY+N0iLBPbUuczVVF3igCIQD5zfgKPMz8nkyAb0ab1Sm7Yqy+EWpNg3hCzo+O 5HcmfwB1ACk8UZZUyDlluqpQ/FgH1Ldvv1h6KXLcpMMM9OVFR/R4AAABY7jzmtsA AAQDAEYwRAIgKgmTjBcjWxA417LoVhfYzPFQwjc2is5irtVKBO5ixPQCIAasv2GN J9fq4tHXxxQYVYBZtyd86A1tzpqJfaxuuRg1MA0GCSqGSIb3DQEBCwUAA4IBAQAZ rw1h7SG8wtUXZSQNddUgw7X/MiB4PAFwqL+Y6tQJwGtrs66WE3iBiEkmdiZcIaW5 dEZdG6JFXFJ6k49ZcjEYQ6xZGzrgKGeRLELqFLNhpiZmOu1fpr2ndGzEiUziyMJ3 T2OpIqh+Qt2dgNxWoDuIZBEbTsSwIo/oEsoM6crXqX6/vkmoQawm6VTg2GdiNrQX d0wQp1xDz4odUmaL6CElUoLnBFiRbpS96dyJyE5eB/7lb03C+maSqPsBfXjnQzNR n8vpUh4VP5yrMOBQjubFwtYnMhpT2rc+i0eCZThMAryCzk1z+kJAgFOWGV9cDrfD +QLlsSZsUG0FyJ4bqpE/ -----END CERTIFICATE-----
Public Key (PEM)
-----BEGIN PUBLIC KEY----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA5iSwyRbCNl13qYwFywdI FUaK04GDZgztbM3ZwU1GGgzKPkG/rjx5LcOSXDKcMEMqQ7CLpErH/ebpTNNSSmAE UsG9wWspp2OzscmSHuUyVO9roXzoWmXBOmUtJ3P026qHcRNWXmv2LxynJNdNGWX2 3Q87db2AuGXIfTjSFd7XJdmlHQcn8O3T2eazgHQtixwfs3K+oK/wimrphZcv6UB2 A3Dflzxdn7W05NAN6BXlhAsxjNqAbGpLwZs30fIdOukoZDhiASmK92vcWm6hdqPu lLhNY7kUvxk+IgpMLebqgBPACgdTuTfNwkYRwiEH8s/5l04zho+hga1SQ8RCw+FH 2QIDAQAB -----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 261393770861883203376595122157137266461097 . . . . . . . . [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 2018-06-01 00:26:02 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2018-08-30 00:26:02 +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.keisu.t.u-tokyo.ac.jp' . . . . . . . . [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 29052902935785921570821874658958220977850745958448726355818620155161610796723308946455123036519568070206238223368531812666087542918847282100835150003173386665926220808302110968684945203489898141375333479850498452158517805219397900434715169016414686955987860799410200955281968187706172712271474092409615754247731033439739389149456483162253343700389093578653885488411468427599042659154994588900566330884176475017077640111016020614310376450482645696676213778204388989243297705881860196821218340269970336477315763520812928363969676356245515943493773928748136031092081468369975505992091183640188254198696372224076728584153 . . . . . . . . . . . . . . . . . . . . [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) 4c8a3da4dff51e93e265d5f11e60437d3128b305 . . . . . . . . . . . . . . . . [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 (60 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.keisu.t.u-tokyo.ac.jp' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.www.keisu.t.u-tokyo.ac.jp' . . . . . . . . . . . . . . . . [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 (246 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 1.3.6.1.5.5.7.2.2 (unotice) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:12|false] UTF8String 'This Certificate may only be relied upon by Relying Parties and only in accordance with the Certificate Policy found at https://letsencrypt.org/repository/' . . . . . . . . . . . . . . . . [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) 00ef007600db74afeecb29ecb1feca3e716d2ce5b9aabb36f7847183c75d9d4f37b61fbf6400000163b8f39ae20000040300473045022001ba0dddc48229e514f74e447454908aac1b63e37488b04f6d4b9ccd5545de28022100f9cdf80a3cccfc9e4c806f469bd529bb62acbe116a4d837842ce8f8ee477267f007500293c519654c83965baaa50fc5807d4b76fbf587a2972dca4c30cf4e54547f47800000163b8f39adb000004030046304402202a09938c17235b1038d7b2e85617d8ccf150c237368ace62aed54a04ee62c4f4022006acbf618d27d7eae2d1d7c71418558059b7277ce80d6dce9a897dac6eb91835 . . . . [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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