mail.szu.cz

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 04:76:f7:f3:ab:de:30:be:00:25:81:06:2c:77:fb:14:7b:be 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): 04:76:f7:f3:ab:de:30:be:00:25:81:06:2c:77:fb:14:7b:be
Serial Number (int): 388932047552703002738566078423267085155262
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: d7:79:5a:ff:b3:bc:4b:cd:4d:0b:11:26:0f:1b:f1:cd:6d:30:61:ef
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 59:d7:02:6d:fb:ff:df:de:f7:cb:83:b7:47:70:3c:89:a7:e1:9b:2e
Fingerprint (sha256): 21:5f:71:d7:0b:5e:67:cc:ac:f6:7d:9e:b4:d4:48:38:0c:1b:e5:ba:4a:66:c7:da:24:3d:22:6f:ad:e2:f8:3b

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 388932047552703002738566078423267085155262
 . . . . . . . . [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 2019-09-23 03:21:31 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-12-22 03:21:31 +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 4357942382713249336928756017908461932834150391433209263116062111579110496852410936000177449539657325787754477194543147663440268811589613148831022120380911595819901021541972927881784350554989872583460790039670159557882230697412591687093290061666525040458404196094483730604684406176854471002513355934450196007384678504618928532385033196319504649306786313264498034825809361404353655233788582507295086365068890276988521953270612647703605302769200100486864603889110913400368366010396113302199555919023967571947687291076281850531779434161583038392250431285729383164889147898994267723081881636537110332990938019329965022859908104748001648168497698898558725642852838063289428803222536607805040233556944127181465566136495622793174664209991506740324589842543425878044431089396067731174546227326170002578244046373667971252615749999113364010068733893830386368336502949933232402252202903737976859886767581525393030477040743711911758609989
 . . . . . . . . . . . . . . . . . . . . [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)
							d7795affb3bc4bcd4d0b11260f1bf1cd6d3061ef
 . . . . . . . . . . . . . . . . [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 (245 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (242 bytes)
							00f0007600e2694bae26e8e94009e8861bb63b83d43ee7fe7488fba48f2893019dddf1dbfe0000016d5c5a65d60000040300473045022041bedd1c8b357bead7f09b76217a9918b59bdd8869adc6d86b6f994ecc15f593022100cd867b3848fea55c9a26ad3d062a4d7930aec1a0e167aa3c2f7a1e2b94cb3e71007600293c519654c83965baaa50fc5807d4b76fbf587a2972dca4c30cf4e54547f4780000016d5c5a65ca0000040300473045022100dc95c36d5142f9fa4d3f5471e97a937e3828b4b214449eed4f48db9b6d75349002202d6753b423dd802ce1b973c4cd1c7db3b3c3856e6fa9e86b67259cd859ed3b2f
 . . . . [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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