mail.szu.cz

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 04:13:ad:cb:93:c5:8e:59:c2:fd:fd:75:bc:86:2f:03:ae:60 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=mail.szu.cz

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 04:13:ad:cb:93:c5:8e:59:c2:fd:fd:75:bc:86:2f:03:ae:60
Serial Number (int): 355145522175238105547043257029955200200288
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: 5f:89:70:59:9d:fa:25:7f:f3:59:89:99:8e:e9:24:a2:ba:b4:90:02
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 48:77:b9:9e:1f:9e:85:30:28:3f:11:cf:56:ae:e6:a8:8a:77:8f:06
Fingerprint (sha256): 44:9f:cc:0d:f5:d8:e2:97:a5:f1:94:cc:e2:27:1f:21:2f:d1:a2:42:ba:5e:a5:ac:48:d4:7d:3a:30:ad:e8:be

Issuing Certificate URL: http://cert.int-x3.letsencrypt.org/

Revocation information

OCSP Server: http://ocsp.int-x3.letsencrypt.org

Check the revocation status for certificate mail.szu.cz

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for mail.szu.cz

Public Key Algorithm

RSA

Key Size

3072

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

mail.szu.cz

Other certificates including the domain name szu.cz

(limited to 100 certificates)

Certificate

The complete raw certificate details for mail.szu.cz in PEM and ASN.1 format.

Certificate (PEM)

-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Public Key (PEM)

-----BEGIN PUBLIC KEY-----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-----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 355145522175238105547043257029955200200288
 . . . . . . . . [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 2019-04-16 09:11:10 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-07-15 09:11:10 +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 'mail.szu.cz'
 . . . . . . . . [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 (3184 bits)
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 5211202843284737884589793513217573094439406387584752386826591133798970373050856076589339307828717617377695821097153389416357913644299281939401908949043689065048067809250774617259160630763877867721366487583687752140951728614873181064358616699240231919556222714965054492158312433793034826383406529741292253582680242113137141901527672311831293644529800916144358932518781583769350567682202980542764678495872775977473953322129780039188949927119842819450269285077901684224919298898834979006186062540292023059831301494917412430019793459035713271028569842970689476492710190189915549306381532079120442486993833535905679925583319351431872330344890265337323898954999815975491139766163589813911325690039071839776198859437632081766913713073168857716909241165558052307813226916807723713758298079183347278460675052048063200363838000498960452593911818978323781222053888752033530297658925598297291286314435918785762436476635329899148123467167
 . . . . . . . . . . . . . . . . . . . . [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)
							5f8970599dfa257ff35989998ee924a2bab49002
 . . . . . . . . . . . . . . . . [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 (15 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'mail.szu.cz'
 . . . . . . . . . . . . . . . . [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)
							00f1007700747eda8331ad331091219cce254f4270c2bffd5e422008c6373579e6107bcc560000016a25a10354000004030048304602210089c8c7150f6cec2a4a2ae6e0b5d4bc4a9645bdd42dcc3a7980792307659b6dc1022100b8cc690cf21971e91f5d1962c049172d19bd71d8ee7a88f3ec9e4fff283e12a9007600293c519654c83965baaa50fc5807d4b76fbf587a2972dca4c30cf4e54547f4780000016a25a10356000004030047304502207e26fea54a259ea0249fcf6d9bcaf0dffea56e8b1cfd3e38a4a1de6be22f411302210086bdc7fb1e156b04246b9251fb25fecee3eccc0397a324e4f1a4aae1c6d75fc5
 . . . . [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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