mail.szu.cz

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 04:94:97:42:cf:76:28:77:96:75:ff:58:46:41:83:d5:e1:35 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): 04:94:97:42:cf:76:28:77:96:75:ff:58:46:41:83:d5:e1:35
Serial Number (int): 399011994358116299880182996346228008411445
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: 1f:a3:ac:4b:dd:cc:5a:2a:af:38:2f:8b:0b:af:f6:af:eb:26:5e:e9
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 6e:07:99:02:2b:5e:8d:9b:9c:0b:3b:60:3b:ad:24:da:b9:9d:9a:67
Fingerprint (sha256): 91:91:fe:fa:e9:71:5f:c1:b7:63:d9:63:e0:8d:3a:3a:1a:4b:59:c7:18:7a:be:21:8e:ee:0d:52:e7:a0:ed:cb

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 399011994358116299880182996346228008411445
 . . . . . . . . [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 2019-07-05 06:21:01 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-10-03 06:21:01 +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 3718734540129215962024129127433108150172574063012833693307413885843718994675849065777614122497101080789929462445724939043423844927311468545325761503847863544872720976984472685970750684567422552330432651917687295993606672189621615341759601863369411443284732424956730079378686772847487957021650401566590218813489175239326078886721635319757781148992115812254316379360924124972886709294608341523527843085714375649552761873234484936945995555329906598437102859935058628101670375437992780998167960182307040307182229541964370578712293310120346772042240280539252034553881993345815440956222559382990675021628459857311350933526530529733891127445498625072498119834567147935799060254565197382379382871079184400754534182533660584291382916582807577386268895429611511788532364309570447364043106027568421569350877301587033546661818090133753704862990133929881435586133921557423685060485667117706210605878591652829367314460757352409713941060323
 . . . . . . . . . . . . . . . . . . . . [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)
							1fa3ac4bddcc5a2aaf382f8b0baff6afeb265ee9
 . . . . . . . . . . . . . . . . [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 (247 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (244 bytes)
							00f2007700747eda8331ad331091219cce254f4270c2bffd5e422008c6373579e6107bcc560000016bc101fc8c0000040300483046022100e996c31445bf10dad65989b1ca7aada95390f71ba03780520926b3ab6d289598022100bb87ea46dea637a5c6b5691b33f4f0decee147ee6e19be5a1526daf4380dd453007700293c519654c83965baaa50fc5807d4b76fbf587a2972dca4c30cf4e54547f4780000016bc101fc89000004030048304602210082263cba5064760a5b6c33ef3e8644af3b7c7d6657a4a2e814169f03a5c0c9d0022100f3fe20ba71a0b3291a4227402c8658fddee892e4c0e312ef4fb22b70e8ac1d56
 . . . . [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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