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DAY12.md

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DAY 12

Notes ~

  • RSA is algorithm used for data encryption
  • https is made using RSA algorithm
  • RSA creates a key for security reasons ( in form of encrypted text(random data))
  • KEY is only sent once not again
  • SSL ( Secure Socket Layer) - > TLS (Transport Layer Security)
  • http - > https ( from above point)

Ansible

  • it can automate work with :

    • Linux ( using SSH)
    • Cloud
    • Network (API) - > CISCO (networking company)
    • Docker (GO API)
    • Window (uses WINRM protocol to connect Ansible with windows)

  • while using ANSIBLE use a key not a password

  • Install Ansible on LINUX by add a repo in adhoc.repo

  $ yum install ansible
  • it is made using python ( a module)

working with ANSIBLE

1. connect two different instances
2. ansible need to be installed in one OS
3. ansible is not required in instance where we want to do somework on
4. Assign password to ec2-user in OS 2
5. Change /etc/ssh/sshd.config to accept password in OS2
6. Restart sshd service
7. open /etc/ansible
8. open ansible's inventory file
```
 $ nano /etc/ansible/hosts
```
7. define the ip address of second instance in this file
at the top
```
[a]
ip-address
```
8. run command

```
$ ansible a -u ec2-user -m ping --k

-m stand for module
-k stand for password
-u stand for user
 a is the group name where all ip can be stored
```

Create a RSA key

  • RUN Following Commands
$ ssh-keygen
$ enter-file-name(or just enter)
$ set password on above file( or just enter)
 retype password
  • key is made on ANSIBLE
  • priavate key is saved on OS1 and public is send to OS 2
  • to send public key
$ ssh-copy-id OS2-username@OS2-ip

Hacking - > UDP Message interception

  • in socket programming sender ip or port are never required at both sender or receiver side
  • it can be done using MITM that is 'man in the middle attack'

Cryptography

  • It is the encryption and decryption of data
  • it is of 2 types:
    1. Symmetric works on AES and DES
    2. Asymmetric works on RSA,DSA,ECDSA
  • Symmetric Cryptography uses single key for encryption and decryption of data
  • Symmetric key can not be hacked but access to it was possible earlier
  • to prevent above problem, Asymmetric Cryptography was developed
  • key - pair are developed in Asymmetric cryptography , one is private key and other one is public key where each is a key for other one that is public is used to open private and private to open public