webmail.csie.cyut.edu.tw
Issued by Let's Encrypt Authority X3
About this certificate
This digital certificate with serial number 03:f0:a5:a6:eb:bd:e3:53:5e:da:c6:ba:32:b3:19:29:bb:65 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=webmail.csie.cyut.edu.tw
Let's Encrypt
Organization:
Let's Encrypt
Country:
US
This certificate has expire since
Certificate Details
Serial Number (hex): 03:f0:a5:a6:eb:bd:e3:53:5e:da:c6:ba:32:b3:19:29:bb:65Serial Number (int): 343224815178299732530846210707690462231397
Serial Number lenght: 138 bits, 18 octets
SubjectKeyId: 88:b0:2c:df:c9:29:53:00:16:1d:a0:80:0d:e1:cd:a2:85:5c:39:11
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1
Fingerprint (sha1): f9:90:76:23:f4:d0:4e:7f:62:b2:b8:b2:05:ae:45:d2:bd:45:a9:dc
Fingerprint (sha256): 38:7f:31:e8:97:82:6a:ea:c3:08:85:0f:75:1f:8c:cf:a1:43:3d:8a:03:ca:58:58:8d:2e:1c:fa:53:9c:58:49
Issuing Certificate URL: http://cert.int-x3.letsencrypt.org/
Revocation information
OCSP Server: http://ocsp.int-x3.letsencrypt.orgCheck the revocation status for certificate webmail.csie.cyut.edu.tw
1
DNS Names
0
Email Addresses
0
IP Addresses
Advanced Certificate Properties
Tehnical certificate details for webmail.csie.cyut.edu.tw
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
webmail.csie.cyut.edu.tw
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Certificate
The complete raw certificate details for webmail.csie.cyut.edu.tw in PEM and ASN.1 format.
Certificate (PEM)
-----BEGIN CERTIFICATE----- MIIGGjCCBQKgAwIBAgISA/Clpuu941Ne2sa6MrMZKbtlMA0GCSqGSIb3DQEBCwUA MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD ExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBYMzAeFw0xODA5MjMxOTQ5MjVaFw0x ODEyMjIxOTQ5MjVaMCMxITAfBgNVBAMTGHdlYm1haWwuY3NpZS5jeXV0LmVkdS50 dzCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAPh5s9OeIwQH4puIPzwZ 4nyj9KpxCHB44zxBxTY5utbFkAt9hh0PAz0OHgea9aRYUM/bXU2vFTRZbgZXyjOo cCZkP58pWdA5RL4VNoIZzuK64l7fa+Pkmf54HS4ENMzMyyPmN6VY7VTISmj2BQ4n 8L21hgtv5XN9oTrZWBzr/bDcewadLdM2I3UFzc2AE2KHYaS23Q+5MfCX/EekVq8G HZIDnTzP/6AYM8+00RPSjNbD3EdH/SFNNy43iIkDmMJon/OsR1+JK6zJtQxp3/q9 RJwHyWxiBcd8fc900XqTjDK+yU8mw3A3/EkHvcW4BZY7WvvwCSJbWrquEBUC2dIO XB8CAwEAAaOCAx8wggMbMA4GA1UdDwEB/wQEAwIFoDAdBgNVHSUEFjAUBggrBgEF BQcDAQYIKwYBBQUHAwIwDAYDVR0TAQH/BAIwADAdBgNVHQ4EFgQUiLAs38kpUwAW HaCADeHNooVcOREwHwYDVR0jBBgwFoAUqEpqYwR93brm0Tm3pkVl7/Oo7KEwbwYI KwYBBQUHAQEEYzBhMC4GCCsGAQUFBzABhiJodHRwOi8vb2NzcC5pbnQteDMubGV0 c2VuY3J5cHQub3JnMC8GCCsGAQUFBzAChiNodHRwOi8vY2VydC5pbnQteDMubGV0 c2VuY3J5cHQub3JnLzAjBgNVHREEHDAaghh3ZWJtYWlsLmNzaWUuY3l1dC5lZHUu dHcwgf4GA1UdIASB9jCB8zAIBgZngQwBAgEwgeYGCysGAQQBgt8TAQEBMIHWMCYG CCsGAQUFBwIBFhpodHRwOi8vY3BzLmxldHNlbmNyeXB0Lm9yZzCBqwYIKwYBBQUH AgIwgZ4MgZtUaGlzIENlcnRpZmljYXRlIG1heSBvbmx5IGJlIHJlbGllZCB1cG9u IGJ5IFJlbHlpbmcgUGFydGllcyBhbmQgb25seSBpbiBhY2NvcmRhbmNlIHdpdGgg dGhlIENlcnRpZmljYXRlIFBvbGljeSBmb3VuZCBhdCBodHRwczovL2xldHNlbmNy eXB0Lm9yZy9yZXBvc2l0b3J5LzCCAQMGCisGAQQB1nkCBAIEgfQEgfEA7wB1AG9T dqwx8DEZ2JkApFEV/3cVHBHZAsEAKQaNsgiaN9kTAAABZggxsCkAAAQDAEYwRAIg W4pTjBMfXEZ93gMavuedcO9/mKoLhN3Txe6pu22apOwCID8A5hIZ0gne+pR/4YPe vV52BxmkrQgOZ9itsplUy8oOAHYApFASaQVaFVReYhGrN7wQP2KuVXakXksXFEU+ GyIQaiUAAAFmCDGvLgAABAMARzBFAiBlu9QGtjjzomKg5uMcEsSD1Oe6zh2c3Rk4 9YF2lBQqawIhALQ6CS1W0dTxhKzKB6KJq0dv/XRqArx1tTpSCMo89pitMA0GCSqG SIb3DQEBCwUAA4IBAQBw4NIKA6akyuHu87MN9Ixyiz0wNNp2TcIMOYrzVhcqQlW4 XnFTwnkA/xR8eqw0cGKLW4nnj1LXNaTfsvy/+siskLNVoq+UzDEuosfqODfDWm9x Ssl05yLH144VgDiEXfjLpnW3d4u03DXqAwVSrOO0W4Fa6t1OZnAKGMNemcY3jJYG qcgp3xLWWbs8ltRKV2G4OGPUQSGoYkiSi/0kmEOu0YfmopXI0UVWVKXbEIR85s4V cOMuAEkDCvVUTvSggTHHiH6p0DadlaSNqNry2aKFLzWRDSp8s4pwLI29znhI4xst 1uoOJKdqEYkfKuOuwCuenTuO06t5jr28K7j+B64F -----END CERTIFICATE-----
Public Key (PEM)
-----BEGIN PUBLIC KEY----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA+Hmz054jBAfim4g/PBni fKP0qnEIcHjjPEHFNjm61sWQC32GHQ8DPQ4eB5r1pFhQz9tdTa8VNFluBlfKM6hw JmQ/nylZ0DlEvhU2ghnO4rriXt9r4+SZ/ngdLgQ0zMzLI+Y3pVjtVMhKaPYFDifw vbWGC2/lc32hOtlYHOv9sNx7Bp0t0zYjdQXNzYATYodhpLbdD7kx8Jf8R6RWrwYd kgOdPM//oBgzz7TRE9KM1sPcR0f9IU03LjeIiQOYwmif86xHX4krrMm1DGnf+r1E nAfJbGIFx3x9z3TRepOMMr7JTybDcDf8SQe9xbgFljta+/AJIltauq4QFQLZ0g5c HwIDAQAB -----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 343224815178299732530846210707690462231397 . . . . . . . . [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 2018-09-23 19:49:25 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2018-12-22 19:49:25 +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 'webmail.csie.cyut.edu.tw' . . . . . . . . [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 31367113345324686899228298964384453454500901372761710853574255962980143240942584068630564478431398045283749664014388563917418250079234562307342378786744420772789636489923488702475843681555645935618968458768252821290789849385937856788379711488866498246368472863419497971308683055941462988062277576007200964347167813736323419813503554677381221409461487366368191692912892724076123675163336874621028812584975324537773504000061350181096417975336749260993905890262746284997737579605891887854738220107299664984827013165486056037524123725079599666650749788578725632282941420219319477517052465006499457529255815996717354867743 . . . . . . . . . . . . . . . . . . . . [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) 88b02cdfc9295300161da0800de1cda2855c3911 . . . . . . . . . . . . . . . . [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 (28 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'webmail.csie.cyut.edu.tw' . . . . . . . . . . . . . . . . [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) 00ef0075006f5376ac31f03119d89900a45115ff77151c11d902c10029068db2089a37d913000001660831b029000004030046304402205b8a538c131f5c467dde031abee79d70ef7f98aa0b84ddd3c5eea9bb6d9aa4ec02203f00e61219d209defa947fe183debd5e760719a4ad080e67d8adb29954cbca0e007600a4501269055a15545e6211ab37bc103f62ae5576a45e4b1714453e1b22106a25000001660831af2e0000040300473045022065bbd406b638f3a262a0e6e31c12c483d4e7bace1d9cdd1938f5817694142a6b022100b43a092d56d1d4f184acca07a289ab476ffd746a02bc75b53a5208ca3cf698ad . . . . [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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