kikagaku.co.jp
Issued by E5
About this certificate
This digital certificate with serial number 03:5b:a0:81:fa:9b:85:b3:42:d6:d0:6e:39:04:2b:53:24:25 was issued on by Let's Encrypt.
With 2 subject alternative names this certificate can be used to secure multiple fqdn's. This certificate is currently not expired, we haven't checked the revocation status of this certificate but you can do this simply on revocationcheck.com. 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=kikagaku.co.jp
Let's Encrypt
Organization:
Let's Encrypt
Country:
US
This certificate will expire on
Certificate Details
Serial Number (hex): 03:5b:a0:81:fa:9b:85:b3:42:d6:d0:6e:39:04:2b:53:24:25Serial Number (int): 292515904553630621969762815679802845111333
Serial Number lenght: 138 bits, 18 octets
SubjectKeyId: b5:4c:0f:e9:75:a3:00:db:95:9d:28:86:0c:08:74:7d:3f:82:3a:86
AuthorityKeyId: 9f:2b:5f:cf:3c:21:4f:9d:04:b7:ed:2b:2c:c4:c6:70:8b:d2:d7:0d
Fingerprint (sha1): 31:37:07:3b:22:5f:d2:e6:aa:41:b1:21:b3:15:b4:91:0b:10:83:6d
Fingerprint (sha256): 91:cb:c2:e3:60:f3:4e:94:5b:58:cd:32:81:4f:a9:b9:bd:e8:9f:bc:da:f0:df:f2:be:e1:86:cb:e1:f4:ee:da
Issuing Certificate URL: http://e5.i.lencr.org/
Revocation information
OCSP Server: http://e5.o.lencr.orgCheck the revocation status for certificate kikagaku.co.jp
2
DNS Names
0
Email Addresses
0
IP Addresses
Advanced Certificate Properties
Tehnical certificate details for kikagaku.co.jp
Public Key Algorithm
ECDSA
Key Size
256
Signature Algorithm
ECDSA with SHA384
Key Usage
Digital Signature
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
kikagaku.co.jp
o1.ptr9629.kikagaku.co.jp
o1.ptr9629.kikagaku.co.jp
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Certificate
The complete raw certificate details for kikagaku.co.jp in PEM and ASN.1 format.
Certificate (PEM)
-----BEGIN CERTIFICATE----- MIIDmTCCAx6gAwIBAgISA1uggfqbhbNC1tBuOQQrUyQlMAoGCCqGSM49BAMDMDIx CzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MQswCQYDVQQDEwJF NTAeFw0yNDA2MTQxNTQxNDNaFw0yNDA5MTIxNTQxNDJaMBkxFzAVBgNVBAMTDmtp a2FnYWt1LmNvLmpwMFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEmJ5z9r14vcCx uCmIHbK+deVuelMg/F7h9vPH1AI1/5elartflg7ox5fEQ7clKOnEIPml4zfo2ylg lXRwleHEFKOCAiswggInMA4GA1UdDwEB/wQEAwIHgDAdBgNVHSUEFjAUBggrBgEF BQcDAQYIKwYBBQUHAwIwDAYDVR0TAQH/BAIwADAdBgNVHQ4EFgQUtUwP6XWjANuV nSiGDAh0fT+COoYwHwYDVR0jBBgwFoAUnytfzzwhT50Et+0rLMTGcIvS1w0wVQYI KwYBBQUHAQEESTBHMCEGCCsGAQUFBzABhhVodHRwOi8vZTUuby5sZW5jci5vcmcw IgYIKwYBBQUHMAKGFmh0dHA6Ly9lNS5pLmxlbmNyLm9yZy8wNAYDVR0RBC0wK4IO a2lrYWdha3UuY28uanCCGW8xLnB0cjk2Mjkua2lrYWdha3UuY28uanAwEwYDVR0g BAwwCjAIBgZngQwBAgEwggEEBgorBgEEAdZ5AgQCBIH1BIHyAPAAdwBIsONr2qZH NA/lagL6nTDrHFIBy1bdLIHZu7+rOdiEcwAAAZAXoFnUAAAEAwBIMEYCIQDAuEFJ XEnXaDfbz1NtHml5vvi1AOioKdkjW+/EJZgQeAIhAMSiTw8JRsC5T898Ec2NF1/y IUKtpkUYsiG6vVWr66seAHUAGZgQcQnw1lIuMIDSnj9ku4NuKMz5D1KO7t/OSj8W tMoAAAGQF6BbEwAABAMARjBEAiAxhKmBUhJPZZZlKqCtZuuFc59Zb4pq9TjY5gtr rAK5vwIgfKmjmLXrRatU1zphT7WRwvamwYZKXzJ5i06rMeCe0eYwCgYIKoZIzj0E AwMDaQAwZgIxALpiCmKYIAOd3R27CgARnJu4J4bGAxYe/ZgvfZl49NsmvoK9u4IS ScIm6z1Qe6pQeAIxANHTYpDPpZDKgRKOXrF/TU75UGaF02w12TnRn5J62Mcfv1cS mGx1N/UB1zRFuFXqOA== -----END CERTIFICATE-----
Public Key (PEM)
-----BEGIN PUBLIC KEY----- MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEmJ5z9r14vcCxuCmIHbK+deVuelMg /F7h9vPH1AI1/5elartflg7ox5fEQ7clKOnEIPml4zfo2ylglXRwleHEFA== -----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 292515904553630621969762815679802845111333 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.10045.4.3.3 (ecdsaWithSHA384) . . . . . . . . [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 'E5' . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-06-14 15:41:43 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-09-12 15:41:42 +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 'kikagaku.co.jp' . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.10045.2.1 (ecPublicKey) . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.10045.3.1.7 (prime256v1) . . . . . . . . . . . . [c:0|t:3|false] BIT STRING (520 bits) 0004989e73f6bd78bdc0b1b829881db2be75e56e7a5320fc5ee1f6f3c7d40235ff97a56abb5f960ee8c797c443b72528e9c420f9a5e337e8db296095747095e1c414 . . . . . . . . [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 (1 bits) 0780 . . . . . . . . . . . . . . . . [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) b54c0fe975a300db959d28860c08747d3f823a86 . . . . . . . . . . . . . . . . [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 9f2b5fcf3c214f9d04b7ed2b2cc4c6708bd2d70d . . . . . . . . . . . . . . . . [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://e5.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://e5.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 (45 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'kikagaku.co.jp' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'o1.ptr9629.kikagaku.co.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 (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 (245 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (242 bytes) 00f000770048b0e36bdaa647340fe56a02fa9d30eb1c5201cb56dd2c81d9bbbfab39d884730000019017a059d40000040300483046022100c0b841495c49d76837dbcf536d1e6979bef8b500e8a829d9235befc425981078022100c4a24f0f0946c0b94fcf7c11cd8d175ff22142ada64518b221babd55abebab1e0075001998107109f0d6522e3080d29e3f64bb836e28ccf90f528eeedfce4a3f16b4ca0000019017a05b13000004030046304402203184a98152124f6596652aa0ad66eb85739f596f8a6af538d8e60b6bac02b9bf02207ca9a398b5eb45ab54d73a614fb591c2f6a6c1864a5f32798b4eab31e09ed1e6 . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.10045.4.3.3 (ecdsaWithSHA384) . . . . [c:0|t:3|false] BIT STRING (832 bits) . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:2|false] INTEGER 28686964753313319617226803039437201650358750270850689178842353908285225774588047293272168724759960700970188376002680 . . . . . . . . . . . . [c:0|t:2|false] INTEGER 32295134483095817443293898727814300647332069212941377532536139047331000176108773974783052973667965531484279520225848