www.smartcitychallenge.com

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:75:95:74:f2:5f:a1:ac:6c:32:4d:49:0c:16:a1:e7:e7:3d 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=www.smartcitychallenge.com

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:75:95:74:f2:5f:a1:ac:6c:32:4d:49:0c:16:a1:e7:e7:3d
Serial Number (int): 301348556918757917725479155654887779854141
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 29:5b:81:71:96:57:3b:66:98:75:60:60:23:d8:13:fa:b3:dc:93:be
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 16:0b:a0:a9:60:ea:db:bb:6c:10:16:a9:3d:df:eb:20:59:6d:8a:50
Fingerprint (sha256): 17:1a:bf:1e:1d:f6:f2:39:ad:7c:ff:71:9f:3b:af:52:0b:98:da:58:e8:1b:b7:84:f7:5a:a5:d4:63:c1:c1:7c

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 www.smartcitychallenge.com

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for www.smartcitychallenge.com

Public Key Algorithm

RSA

Key Size

4096

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

www.smartcitychallenge.com

Other certificates including the domain name smartcitychallenge.com

(limited to 100 certificates)

Certificate

The complete raw certificate details for www.smartcitychallenge.com in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEApHPcCRKdLERLP3IrV5ny
seet9VUkMF2BOrj+s6jOVel0pYFjm9KIGhmbq97T8aSndZSHpjw5qdU/RKpxFCwh
LuUlqpcDotm75JFgGXywXCyATRza+IVjbQnOmWGmKkkkeZxdaVexsWVuSEh070Y+
hQB/JU49rf4kC1Ota/jYRZZOakJdsjFoZMLx6ZgbdXYXkG0tNDulwozwyO4EpmdM
neJWj5iiorVzS6/VXBiHIyTqKPupW0Sq12tS8X2ZMJ85PneJ6scf/MfexycTPxtV
ijg6G9Jvq9FDr1GPiBzsjoxvXDegyAZsOXNeOoaHEPAHhgvySl2O4k6fLqBgbX3Y
htksaS28PDF/KRPsF6D1oxcPWjOLVCl+IHQyAASLqnzMP+cGu/bdXAXjsO9NckaX
IU1Bj8W2qqfCYORjV2tC/uaemalnrXXJr+Xk7hcygWwCqqrreSidUKa73fmiVa9/
4hFOopdAMNvpu7e3ZF9xrfaSZTHGqi+S5N5yYNL0iFymFZYg2EQxxHPLPS4N1OLt
ZWrq6+9V/wYxvcE/Jp+H39TFr1PKShXYguqf4HsO3N1syea2qoJWOPSgqtqwtz5f
UqvOPZThpXMOfvbafOFoYq0FlOWZSVcYKlbdPQ2D4oFYQP+OCnIcmkCOnqm/hOfm
KzoAx7R4IRBLy3lpqEWPiFsCAwEAAQ==
-----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 301348556918757917725479155654887779854141
 . . . . . . . . [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 2019-10-21 11:04:46 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-01-19 11:04:46 +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 'www.smartcitychallenge.com'
 . . . . . . . . [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 (4208 bits)
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 670907977064376607522228321133881727219849735067794560341047358233486964717948412150183201881922492780052954004232226768719537120180867543630071710372819104563432849500597288831546291685062852181658988067460992575786636381776619212140464868394721767839591106490675344421086291422835657463536345251878400891923517178124937089159332258770042578268707971961853550913593088540009139667153792797201974600884500793610206162443961815122327670063883841285618194116640448695509571118791934324074780082869541921034151185825430946688709159558461561245107834635948219687277137321649617905222866302842543138297536365965301027479463968175630568887348389483188707340140951127973866253239106240147113490659381408045985517833606310662907470966228264020230302405312251964565022853861153597370446441590507997453249802192550248939855755248866265023884921886342399208741072677691829902139058730067944179844731929846544096651358394285076674893316122140669106033769590214272525738979361815844686130146383918711951622907490878188349273884886175599283240776667668045571748941355524516119823546119858400745277399145204867618683531618185287554802992374859825275925096362598492730549803509565533836160580569646450006847442285007618646732355652910904667037206619
 . . . . . . . . . . . . . . . . . . . . [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)
							295b817196573b669875606023d813fab3dc93be
 . . . . . . . . . . . . . . . . [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 (30 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.smartcitychallenge.com'
 . . . . . . . . . . . . . . . . [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)
							00f0007700293c519654c83965baaa50fc5807d4b76fbf587a2972dca4c30cf4e54547f4780000016dee3494400000040300483046022100dd765d9be53420b18ba8b4937252c89e76861ba3e798a214ec54d7182661d277022100a9862f30bfbfc9a91f893b91e97a162f68cbde5698e6eea10c892859dfeeb7c8007500f095a459f200d18240102d2f93888ead4bfe1d47e399e1d034a6b0a8aa8eb2730000016dee3496420000040300463044022073ffb78371f105670dcc6e8e7370b1ecc65d0520f659aafd19a52328e3a2db01022034009485b7dd7bf344b0d5354a2a0d9bc9ff861e16b3c7dbff065c1a7d5023fe
 . . . . [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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