cosanum.ch

Issued by Amazon

About this certificate

This digital certificate with serial number 09:39:ae:b8:59:a9:50:45:e0:a0:99:f5:fc:9c:e5:e1 was issued on by Amazon.

With 3 subject alternative names this certificate can be used to secure multiple fqdn's. 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=cosanum.ch

Amazon

Organization: Amazon
Organization unit: Server CA 1B
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 09:39:ae:b8:59:a9:50:45:e0:a0:99:f5:fc:9c:e5:e1
Serial Number (int): 12262556628002519462197046314260030945
Serial Number lenght: 124 bits, 16 octets

SubjectKeyId: bb:fb:7a:42:2a:d4:1d:88:be:8c:e2:71:94:d6:35:be:85:4b:0f:ba
AuthorityKeyId: 59:a4:66:06:52:a0:7b:95:92:3c:a3:94:07:27:96:74:5b:f9:3d:d0

Fingerprint (sha1): 0d:90:14:95:f4:e1:ac:1d:0c:13:44:3c:34:a7:ee:6a:bf:d0:fb:9e
Fingerprint (sha256): 76:3a:b3:7c:35:87:13:1b:ea:0f:5e:3b:08:63:4b:df:33:91:cf:51:ad:96:0c:a3:68:b6:95:76:46:56:10:5f

Issuing Certificate URL: http://crt.sca1b.amazontrust.com/sca1b.crt

Revocation information

OCSP Server: http://ocsp.sca1b.amazontrust.com
CRL Distribution Point: http://crl.sca1b.amazontrust.com/sca1b-1.crl

Check the revocation status for certificate cosanum.ch

3

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for cosanum.ch

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

10 extensions
No unhandled critical extensions

CA Certificate

This is not a CA certificate

Subject Alternative Names

cosanum.ch
www.cosanum.ch
shop.cosanum.ch

Other certificates including the domain name cosanum.ch

(limited to 100 certificates)
ifasinnovation.cosanum.ch
cosanum.ch
webmail.cosanum.ch
cdn.cosanum.ch
*.cosanum.ch
ortho.cosanum.ch
ifasinnovation.cosanum.ch
cosanum.ch
*.cosanum.ch
webmail.cosanum.ch
cosanum.ch
webmail.cosanum.ch
*.cosanum.ch
*.cosanum.ch
webmail.cosanum.ch
*.cosanum.ch
coosa.cosanum.ch
*.cosanum.ch

Certificate

The complete raw certificate details for cosanum.ch in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAoF9Aptno3NUABNimCzgz
Nz2kDUr3XqCm5wiqVJKlC0OV6s+mEI1bWM578yXcuMYxwuyt165HxDXPuf+8VPRG
c7vc33B3UTay+SeJUIm1SNKDqyeqGniI1R/mucLrkcZc6pK9dOV8sbdr+CwziZbA
O4zeqcVPOZ+Dn9VSvix6Ited329Vj+CFfKE0yqrM9aJwaAPQ5LO9JhzD1HxTcc5m
XalwLvLO/1f4PBqhaw5Dn+5YfUBj45L/RvPWFK509tL/bpmGA2adfOr4pTsdJ7qM
DsW96GQwWF+nk/JWWbe1C7jUBgvH1BY28PLfgQlv9FNhyGkSVHEsSkO+l2iJn3hd
awIDAQAB
-----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 12262556628002519462197046314260030945
 . . . . . . . . [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 'Amazon'
 . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF 
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.11 (organizationalUnitName)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'Server CA 1B'
 . . . . . . . . . . . . [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 'Amazon'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2022-03-02 00:00:00 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2023-03-31 23:59:59 +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 'cosanum.ch'
 . . . . . . . . [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 20245099575601030482776513537248404949362521245091191616727192197298544306126175655430354428675091812725617743990896486844327338149723188300331996927440587751006318714136486024202531938641952709254845020411068941350028811630935012555645964711803193735567250280369800997189438849884559516481892633975652307071677345809806404100131587583179211608254533209614239080504210230442810386044506577743952670016500073641835684639562422812305210777193784609577536649826250818281209881284231908939511706322637625868265864451844359648207974223813915595329394694526435080193461868266593901258441235313754945256861958495654330785131
 . . . . . . . . . . . . . . . . . . . . [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 2.5.29.35 (authorityKeyIdentifier)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (24 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|false] OtherName 59a4660652a07b95923ca394072796745bf93dd0
 . . . . . . . . . . . . . . . . [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)
							bbfb7a422ad41d88be8ce27194d635be854b0fba
 . . . . . . . . . . . . . . . . [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 (47 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'cosanum.ch'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.cosanum.ch'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'shop.cosanum.ch'
 . . . . . . . . . . . . . . . . [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 2.5.29.31 (cRLDistributionPoints)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (54 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|true] OtherName 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|true] OtherName 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://crl.sca1b.amazontrust.com/sca1b-1.crl'
 . . . . . . . . . . . . . . . . [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 1.3.6.1.5.5.7.1.1 (authorityInfoAccess)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (105 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.sca1b.amazontrust.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [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://crt.sca1b.amazontrust.com/sca1b.crt'
 . . . . . . . . . . . . . . . . [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 1.3.6.1.4.1.11129.2.4.2
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (365 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (361 bytes)
							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
 . . . . [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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