spektrum.ctu.gov.cz

Issued by R3

About this certificate

This digital certificate with serial number 04:82:5f:9a:d7:04:eb:e8:30:14:6f:e6:28:36:11:86:4a:9c 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:
  • 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=spektrum.ctu.gov.cz

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 04:82:5f:9a:d7:04:eb:e8:30:14:6f:e6:28:36:11:86:4a:9c
Serial Number (int): 392812932061186755318429906763186608425628
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: 75:23:1f:2d:95:8a:c8:71:dc:eb:51:70:7e:c9:ca:16:c0:96:f1:1b
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): ba:27:15:b2:42:26:f7:9f:56:25:34:86:85:34:6b:a4:e5:0c:27:e7
Fingerprint (sha256): 11:cd:00:57:bb:19:82:12:a7:e9:cd:5e:56:2f:db:33:12:e5:46:b4:bc:47:d8:a3:88:03:75:30:53:5c:02:bf

Issuing Certificate URL: http://r3.i.lencr.org/

Revocation information

OCSP Server: http://r3.o.lencr.org

Check the revocation status for certificate spektrum.ctu.gov.cz

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for spektrum.ctu.gov.cz

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

spektrum.ctu.gov.cz

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prod.frs.gov.cz
tsl.gov.cz
isnipi.gov.cz
testrs.gov.cz
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www.snsu.cz
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biap1t.ros-iais.egon.gov.cz
viap1p.ros-iais.egon.gov.cz
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mk.gov.cz
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Certificate

The complete raw certificate details for spektrum.ctu.gov.cz in PEM and ASN.1 format.

Certificate (PEM)

-----BEGIN CERTIFICATE-----
MIIE8jCCA9qgAwIBAgISBIJfmtcE6+gwFG/mKDYRhkqcMA0GCSqGSIb3DQEBCwUA
MDIxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MQswCQYDVQQD
EwJSMzAeFw0yMzEyMDcwNzEzMzhaFw0yNDAzMDYwNzEzMzdaMB4xHDAaBgNVBAMT
E3NwZWt0cnVtLmN0dS5nb3YuY3owggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEK
AoIBAQDlvKJYNgYRlElZXapDy/br07Dy0xSkWG95z5HG/jG6hgvQz0oy83B0SMRN
CK3BgOF5/J8udOkYTvT402IJYt7FE6ChjbF8g70+xcafuY8wfWsKgsCbPup+jyix
Ejpb6207/kHYgSvu/B+PrZfnMTFUf3aCNeDC7r1D5uIMA/qn9rJYpfi5r4OpMW2f
D7PKINfKoOeceXh6c7w1nICuItaNof5FulUVB8Jl45QsZiviZ/kWlR9hagZIvZTd
cgiZXXJ6kEYRfNBLXNLyEejVKJ+MHJInXQ2y8h5ag1TKPvCEnlNt52Cp5dEboQiV
lc9k7DKGO3/I5rrH7EhsdfNcbt4rAgMBAAGjggIUMIICEDAOBgNVHQ8BAf8EBAMC
BaAwHQYDVR0lBBYwFAYIKwYBBQUHAwEGCCsGAQUFBwMCMAwGA1UdEwEB/wQCMAAw
HQYDVR0OBBYEFHUjHy2Vishx3OtRcH7JyhbAlvEbMB8GA1UdIwQYMBaAFBQusxe3
WFbLrlAJQOYfr52LFMLGMFUGCCsGAQUFBwEBBEkwRzAhBggrBgEFBQcwAYYVaHR0
cDovL3IzLm8ubGVuY3Iub3JnMCIGCCsGAQUFBzAChhZodHRwOi8vcjMuaS5sZW5j
ci5vcmcvMB4GA1UdEQQXMBWCE3NwZWt0cnVtLmN0dS5nb3YuY3owEwYDVR0gBAww
CjAIBgZngQwBAgEwggEDBgorBgEEAdZ5AgQCBIH0BIHxAO8AdQA7U3d1Pi25gE6L
MFsG/kA7Z9hPw/THvQANLXJv4frUFwAAAYxDVuu+AAAEAwBGMEQCIEqGkvM6MrAD
ccRMJMJ9jA7CSb9Am4ynxotF+kurlNGxAiBjicjs03tgsYeH/EwojKaCwe5UvgCs
gotYnOhbgsYv3QB2AEiw42vapkc0D+VqAvqdMOscUgHLVt0sgdm7v6s52IRzAAAB
jENW68MAAAQDAEcwRQIgF888xphu2tpDyVByVOoGOHH70Aa2Kvf9E7FnjzrPieAC
IQCtLfZ9Tr1oPNpIkg6048gMc+GVSfSkc9ffRMl2opwqxDANBgkqhkiG9w0BAQsF
AAOCAQEAL07i5wSwBVs+wAmvazxiAykuLJ9f9r82HOgsa8qKIEPzArOZri1SCJNJ
b3jSwlEZiA28+3jxzw9s5sbngZ0GA20D2gHch2XrdgONrOeMSuuHLqysU9Ze1LYW
Ew3zC9UP0vmE7pJenfzz32q0sJNCyeC7UQPlRfGPa8Iu2sDHqyKXBYKTm3YLe/P2
3TqDqmCWzW9s8+ENhxAGBrM91VC74jcKsY8tx7XjawvZfv0LC5EX2KBLnywgR4QJ
sHEmpMXySzuZFScP4rqV4VNll8lXL7ryWKpU0JryM/UOA/8S1/jnVXR0lq6zLWNk
viU/YQ6wndPF488inWxp8DSsI2/7yQ==
-----END CERTIFICATE-----

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA5byiWDYGEZRJWV2qQ8v2
69Ow8tMUpFhvec+Rxv4xuoYL0M9KMvNwdEjETQitwYDhefyfLnTpGE70+NNiCWLe
xROgoY2xfIO9PsXGn7mPMH1rCoLAmz7qfo8osRI6W+ttO/5B2IEr7vwfj62X5zEx
VH92gjXgwu69Q+biDAP6p/ayWKX4ua+DqTFtnw+zyiDXyqDnnHl4enO8NZyAriLW
jaH+RbpVFQfCZeOULGYr4mf5FpUfYWoGSL2U3XIImV1yepBGEXzQS1zS8hHo1Sif
jBySJ10NsvIeWoNUyj7whJ5TbedgqeXRG6EIlZXPZOwyhjt/yOa6x+xIbHXzXG7e
KwIDAQAB
-----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 392812932061186755318429906763186608425628
 . . . . . . . . [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 'R3'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2023-12-07 07:13:38 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-03-06 07:13:37 +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 'spektrum.ctu.gov.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 (2160 bits)
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 29001590807645074707021009626259676040623336908031930702632767399681895948740222754309842594588972586484905654971806572442293249441514446705549951003536301372361490425689970585891009621353119384852706443814612208873895531180322221215255697266478515616455242782551887376497583741186279007090051790862902967333718091349832601011313983484292290072590524483105320093226305728598836518588547388522445690678427660375678263635565415103881263319773327296734883228600928256008565068532048753024265213835927511466212346790597245547122554134544320697477475302553415106471310347045704617620088862965294667667347222023971787431467
 . . . . . . . . . . . . . . . . . . . . [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)
							75231f2d958ac871dceb51707ec9ca16c096f11b
 . . . . . . . . . . . . . . . . [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 142eb317b75856cbae500940e61faf9d8b14c2c6
 . . . . . . . . . . . . . . . . [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://r3.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://r3.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 (23 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'spektrum.ctu.gov.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 (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 (244 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (241 bytes)
							00ef0075003b5377753e2db9804e8b305b06fe403b67d84fc3f4c7bd000d2d726fe1fad4170000018c4356ebbe000004030046304402204a8692f33a32b00371c44c24c27d8c0ec249bf409b8ca7c68b45fa4bab94d1b102206389c8ecd37b60b18787fc4c288ca682c1ee54be00ac828b589ce85b82c62fdd00760048b0e36bdaa647340fe56a02fa9d30eb1c5201cb56dd2c81d9bbbfab39d884730000018c4356ebc30000040300473045022017cf3cc6986edada43c9507254ea063871fbd006b62af7fd13b1678f3acf89e0022100ad2df67d4ebd683cda48920eb4e3c80c73e19549f4a473d7df44c976a29c2ac4
 . . . . [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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