biossido.com

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:31:f6:c3:75:ef:0a:98:a5:dd:e4:23:40:d0:29:dd:de:fb 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=biossido.com

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:31:f6:c3:75:ef:0a:98:a5:dd:e4:23:40:d0:29:dd:de:fb
Serial Number (int): 278338698751237962103960004584483902578427
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 2c:73:fe:c8:d1:1d:df:fd:79:64:27:0c:67:d6:9a:55:7a:10:07:f9
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 18:b2:96:05:69:90:0e:25:cb:f8:92:ab:24:88:94:51:e8:ee:67:93
Fingerprint (sha256): 93:ac:9e:43:d9:3a:7a:f8:4b:de:44:d4:22:75:73:ea:2a:cf:a2:ac:bf:5a:8a:58:a1:79:7f:6a:10:9b:f8:9b

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 biossido.com

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for biossido.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

biossido.com

Other certificates including the domain name biossido.com

(limited to 100 certificates)
lift-mate.com
www.biossido.com
www.wrrco.com
biossido.com
biossido.com
biossido.com
69902.com
biossido.com
biossido.com
biossido.com
biossido.com
biossido.com
biossido.com

Certificate

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

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEA2+sYLXEWoDKsD8YeWLI1
vBjGcpfPc3E5VxqmfYAqoDc4Mp+IWZlTZesIangA3568c3ja12EmfdBZC/nqQEip
SPAhW1o3EreD0BEN5CsGhkVSfCK5LTuwK74PPVhQEMqHIynH7Vazmr+bSL+v/Q2b
LMsTSz5Gc7sgSwL8oO3Z/KB70zxb1HkykByPi5B6Q97xCgEddd0nXx9gyIAmUwMT
rkzlUwBFlTCNGNKhpnkkGHKTGdKqHlICYq1M87EUcQAAiG5Dar8UR1eZc4aRjLeb
YrR4fgx9EdOtpDanup1UKxTnihqqcCBEkHjtCYqdhwTi2AdgAAtMaQcX9OJMdT4N
jknbrV5WlJmtv+Kp1Xb0XWw+I49rOaMTYpc7Hnd8mEPcFWCc5B8NPKHsVqnYIAVB
OIqf8EVYU8Qoki9TekJnIhdfno7T3cnWkSGIcM7+jo3VOHPzSrYUNk0ga0sLEabD
jro6DRe/a3nUjDbGFkHul/8GryW6IQXamWcCn2uuU0b1Q4abmh/+q4ZmV7WSTm7F
wr1LAajD54NiQVez7TVSgK1kvJA4k/KycGFaJArzmj0hyca+f/PG9HOxxEhDlvo0
N1F+IOzRRxt/gNYBWp3oDXx1VFThlxROgo8a5dqKYBNVvj/gZtxlh9p3+HjYkQBm
sAdl4zm/n8qTCQb1vNwcDecCAwEAAQ==
-----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 278338698751237962103960004584483902578427
 . . . . . . . . [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 2019-07-27 02:43:06 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-10-25 02:43:06 +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 'biossido.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 897188541722128898587359031932750944673393706920225288451604985873568909178585443325499430761493175981551240749407684877044257439473345099692054806887898866453766716128840651038817040974802865203126491874191597818482934653333903346160535569952942318140845901434146946914365345315480531026110896927668295385495358084112488781736015539006885065519119353302603755862648191387935817903781905501210850735895143128576682784536936149871407385494739998986866326555227590656754575012050795621086038515104994097239335389476113535083901156110143282522714006235778950722328707168500533199894305484593206908594659614545384143611563364680274861273388719226665482765704442152296639080071814613089963109943089460589929946858469926685326790341737867774140532943112717449758240219837614221094875781627231923484111640112255135140896252462312299337337933581995728303096060661474108497660458475121357215091385257172059474035678452148022747167309813592275447043291443447908178828120501557836426369800283065160693576243371314057110264019918655260401018159201063936804242289108184579486483615214924576930253027741768916704821221641031386810806067568688965353067545666327390439947686454853379907705947295049745001825269322629273223616367941118979092399263207
 . . . . . . . . . . . . . . . . . . . . [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)
							2c73fec8d11ddffd7964270c67d69a557a1007f9
 . . . . . . . . . . . . . . . . [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 (16 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'biossido.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)
							00f0007600e2694bae26e8e94009e8861bb63b83d43ee7fe7488fba48f2893019dddf1dbfe0000016c318663ee00000403004730450221009b24a8133ebac746bf3e9c0e9f2f3614b0fe2129a755f77de9b961cacfdb85c9022020d4d28c488e46a8f5d00b63500fcfe7536d7af33456f70bf970001e61f771d7007600293c519654c83965baaa50fc5807d4b76fbf587a2972dca4c30cf4e54547f4780000016c318663ed0000040300473045022015bf19b4561f7cc27daf7a1fe9e464620134f01a5a71dfb77405a6634739b719022100fc3a631e8815f7b8e51541ebebf857148fb0cdf944d1b39dcddbf1cdcd2c9310
 . . . . [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)
		006d15306fb9d0f3ce7367313778360f076b616b992706368f7c96c4074f2bf1046953ec6a8f83cef48fb945aa864e66de48083ffdcbbfd11fa7692b8ef57a2fd8a944e0fb94be156e1543d896a79bc74ab0ef0b45683d9db76b2aaa196fdb830012856ffe5b14d07d38e56c90344f96e7a4feea95b0830a964cc55a836087615d7bca5e2f389e5011904856d82ac98ea03623414b3384ca7f0fa4044cc0b1cb71722b9a4962d8ee06f0cd3a17754964934475ea698dd430af66a2ab16177a735c586d3e1cc11ac373f78510f5dc3f33ff95d330c8f97b6b183f091aeb74dbe6c07499ac23dffc5f9206ac850fda97f2d56ad343c67d0276a782ee15477e5a4c1d