Generate Free SSL Certificate using ZeroSSL

 Hi all,

Today I am going to explain the process of generating free SSL certificate using ZeroSSL

Pre-requisite

1. We should have our own domain
2. We should be able to add/update the DNS settings like A, CNAME, TXT records

Best free SSL providers

As per my research I found the best free SSL (90 days) certificate providers

1. ZeroSSL
2. Let's Encrypt

In this blog, i'll explain ZeroSSL process

ZeroSSL Free SSL Certificate

1. Navigate to https://zerossl.com/
2. Signup with your email by clicking on "FreeSSL"
3. After email verification, login to zerossl site
4. Click on "New Certificate"
5. 
6. Enter your domain name and click on "Next Step"
7. Default validity is 90 days for free SSL
8. 
9. In the CSR section we have couple of options
10. Default is Auto-Generate CSR enabled
11. Disable Auto-Generate CSR - only your zerossl registered email address with default values
12. Enable Paste Existing CSR - If you have already created a CSR then you can use this option
13. 
14. Finalize your order
15. 

Note

ZeroSSL will generate the certificate using signature algorithm SHA-384

In some cases, if SHA-384 based SSL is not valid then we have to mandatory go for alternate "Let's Encrypt". I will explain Let's Encrypt in my next blog.

For every 90 days, we need to renew our certificate in the above mentioned manner.

Download Certificate

1. Navigate to Certificates section
2. Go to Issued tab
3. 
4. Click on "Install"
5. 
6. You can select the Default Format dropdown to select specified server or just leave it default.
7. Download the certificate zip file which will contain 
1. ca_bunder.crt - CA Bundle
2. certificate.crt - Certificate
3. private.key - Private Key

Hope, you will be able to make use of this free SSL feature and encrypt your domain traffic.

Please let me know your feedback and suggestions in comments or mail to psrdotcom@gmail.com

Generate or Create ECDSA - Elliptic Curve Digital Signature Algorithm Keys using OpenSSL in Windows

 Hi folks,

Today we will see how we can create ECDSA (Elliptic Curve Digital Signature Algorithm) Keys

Pre-requisites

OpenSSL

Add openssl bin directory to the environment PATH variable 

Generate Keys

Open Powershell and execute the following commands

1. Get the ECC curves list

openssl ecparam -list_curves

2. Generate a private key using your chosen curve

openssl ecparam -name prime256v1 -genkey -noout -out private-key.pem

3. Generate public key from the private key

openssl ec -in private-key.pem -pubout -out public-key.pem

4. Create a self-signed certificate with 1 year validity

openssl req -new -x509 -config "<opensslDirPath>/share/openssl.cnf" -key private-key.pem -out cert.pem -days 360

5. Convert pem to pfx

get-content private-key.pem, cert.pem | out-file cert-with-private-key

openssl pkcs12 -export -inkey private-key.pem -in cert-with-private-key -out cert.pfx

 Note: Enter the password when prompted (Optional)

Now, you can install the PFX file and check the certificate properties and make use of it.

Send your valuable feedback and comments to psrdotcom@gmail.com

Simple free and open source generating QR code in your web page or blog with an API call

Hi folks,

Do you want to generate QR codes and display in your website or blog or for development.

You can call these API with the relevant data to get the QR code as an image format

1. https://chart.googleapis.com/chart?cht=qr&chl=Hello+PSR&choe=UTF-8&chs=200x200

    cht -> Chart Type = QR

    chl -> Chart Data = data

    choe -> Chart Encoding = UTF-8

    chs -> Chart Size = width x height

2. https://api.qrserver.com/v1/create-qr-code/?size=200x200&data=SureshRajuPilli

    size = width x heigth

    data = text data which we want to place in QR code

3. https://www.qr-code-generator.com/qr-code-api/ with POST method

    

    Request Body    

{

    "frame_name": "bottom-frame",

    "qr_code_text": "https://www.qr-code-generator.com/",

    "image_format": "SVG",

    "frame_color": "#02bfff",

    "frame_text_color": "#ffffff",

    "frame_icon_name": "mobile",

    "frame_text": "Scan me",

    "marker_left_template": "version13",

    "marker_right_template": "version13",

    "marker_bottom_template": "version13"

    }

Please send your queries and feedback to psrdotcom@gmail.com

Flutter Android Release Failure [INSTALL_FAILED_NO_MATCHING_ABIS] issue fix

Hi folks,

Today I will let you know the flutter issue of Failure [INSTALL_FAILED_NO_MATCHING_ABIS] and its fix.

Procedure

• Add the following config in your app/build.gradle

android {

    splits {

           abi {

                 enable true

                 reset()

                 universalApk true

               }

    }

}

flutter {

    source '../..'

}

Release AppBundle / APK

• Run the following command to generate appbundle

flutter build appbundle

• Run the following command to generate apk

flutter build apk

References

https://developer.android.com/studio/build/configure-apk-splits#configure-abi-split

https://developer.android.com/guide/app-bundle

ICICI Bank ATM Debit Card PIN Changing Procedure with Telephone Codes

Hi friends,
I have mistakenly typed the ATM pin 3 times at ATM. My ICICI card was blocked. This was the second time, it happened to me. I have generated the new PIN by calling customer care.

Then I thought let me write the procedure to activate it through the telephone/mobile.

Please follows these steps to activate your debit card with new ATM pin

1. Turn Back your ICICI card, where your magnetic strip, cvv and grid exists. 
2. On top of the card, you will find the major cities names along with customer care number. 
3. Please call to any one of the customer care number (preferably your region/nearest phone number)
4. 1111
• 1 -> Language Selection (English)
• 1 -> Existing Customer
• 1 -> Banking related queries
• A/c No. (or) Debit Card Number: Full Account Number (or) 16-digit debit card number
• 1 -> Generate PIN
• Card Expiry Date: Enter in the following format Ex: For Mar-2012, Please enter 0312
5. Then the call will be connected to phone banking officer
6. They will ask some security questions regarding your account details, which you have entered in the application form.
7. Once the verification gets over, then the officer will transfer your call, So that you can generate your new PIN
8. System will read the last 4 digits of your debit card
9. You need to enter
• CVV -> Back of your card, 3-digit CVV will be displayed along with your last 4 digits of your card number
• New PIN -> Which you would like to change
• Re-enter PIN -> Same PIN which you have entered as New PIN

Within no time, you can use debit card ATM PIN.

For further assistance:
http://www.icicibank.com/customer-care.html