Md5 Hash fingerprint of the file. how?

In this post, I am sharing one basic information about file integrity method using MD5 Hash

What is Md5hash:

In every file has a unique hash created by themselves, this hash code was used to verify the file is modified or not,
simply tell the MD5 Hash is like a fingerprint of the file,

If you do any small change in file the total Md5sum hash value is changed totally,
 When you are download files such as Linux ISO images and others. At that time some of the hackers can change the file with another file looks same.

In generally the most of the Linux ISO sites gives the md5hash of the file, After downloading you must check the downloaded file mD5hash is equal to given MD5Hash code.
If your calculated hash code is different from given code, definitely your file is been corrupted or may be modified by others.

What is MD5Sum Tool:

MD5SUM is a tool, 
The tool preinstalled un Linux in command line Interface.

Let's find out MD5SUM:

For Example showing, I am created one small example python file to print hello world. 
After Creating a file > Open Terminal > Move on the File Directory >
Type    >md5sum (filename.extension)

An Example I have created a file named hello.py so I am typed md5sum hello.py  

Now it shows that Md5sum hash code

And Again I change a small change in the python file an Print "hello Linux user" 
After I am calculating the md5sum hash 
The total md5sum value is changed

In this screenshot shows on the first time I am created one python file and calculated that fuel Md5sum Hash 

In next, I am changed the file and again I am calculated hash is totally changed than before

That's a use of the Md5sum hash tool. 
And I say,  Lot of another best option is available to check the file integrity, Give me your support I am definitely posting about that, 
Thanks for reading the post.I hope this post really helpful for what is the Md5sum Hash, How to use Md5? And how to check the file integrity using Md5sum? And share this post Maximum.

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how to be safe on free wifi

How to be safe on free wifi networks: 

Generally, the free wifi is really attracting one in nowadays. the free wifi was offered in generally some coffee shops restaurants or some public places

The users can easily connect the wifi to the device and browse freely. But they don't know that's behind risk.

Why this is insecure?

Our all network packets(requests, response) are transmitted between your network router and internet
It can someone watch and also take a log your all internet packets, and even he can manipulate them.

it is done by the network packet analyzer tools like Wireshark

if that hacker connected to the same network and  he has a Wireshark tool they can sniff you all your unencrypted network packets

What is the Wireshark?

Wireshark is the free and open source network packet analyzer, it is used for analyzing the network packet, troubleshooting, communication protocol developments and education purpose 

It is the big chapter to learn the Wireshark but in this time we learn how to filter the HTTP request and view the unencrypted packets details only.

get the Wireshark on your pc. it can available many platforms 

If you using Linux,  Open a terminal  type "sudo apt-get install Wireshark"

How to steal information using free wifi?

disclaimer: it is for fully education purpose only. don't do any illegal purpose

First, you need to connect that wifi network to your pc 

Open your Wireshark, if you're using Linux operating system open in as a superuser

choose your interface

click the capture option at the top of the Wireshark

Now the Wireshark captures all network packets transmitting on that network

the main thing of the Wireshark you need to know how to filter that packet what to you need

 The login request is called as the post request 

so in the filter bar type that code

http.request.method =="post"

now it shows the unencrypted login request details.

choose that packet  to right-click that and select the follow option  and select the TCP stream

Then it shows the full information about the packet, check it has a username and password on that

Note: it is only worked in HTTP unencrypted sites only. 

In HTTPS encrypted site all the information are encrypted so you cannot view any information from that

Most of the internet users use the same login information like usernames and passwords in all Important websites, if you have done in sniffing in HTTP website, then try in other SSL protection websites 

How to be secure from that?

I am already said the Wireshark could not capture the HTTPS (Encrypted) packets
they cannot decrypt the traffic without the decryption key

So while using public wifi use only HTTPS sites,
Nowadays most of the website turned to HTTPS protocol, example facebook google and most of the banking website
but some of the websites do not give an https connection at the condition you can use HTTPS everywhere extension on your browser.

that extension encrypt your packets on the internet 


Or use Virtual Private Network (VPN) when you connect the internet, that VPN encrypts all your connection between your system to device so no one can't steal your packets

And main security point is "Don't use same Login information on all websites" If your anyone login request gets compromised, It will affect your another account 

Do not to be a Victim

thank for reading my blog I hope this post solve security risks on the free wifi, but it, not an end, most of the serious cyber attacks are did in free wifi, follow my Blog continuously in future I will try to cover more over the security information

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[solved] High RAM usage in chromium in Ubuntu

 In this post, I am shared a solution of High amount of RAM consume in chromium browser in Ubuntu systems

Most of the Ubuntu users especially who have only 2GB of RAM memory capacity systems faced this problem 

Solution: High RAM usage in chromium in Ubuntu

We can't do anything in chromium memory usage, But we can stop the other components to occupy memory.

Some Extension is taking more amount of Memory, we can stop or find the best alternatives to solve the high level of memory usage in RAM

Adblocker plus:

The Adblocker is the popular Ad blocking extension in chromium app store, but negative thing of the extension is It consumes nearly 100MB of Memory Usage
Alternative:
I found a low RAM consume Adblocker in official chrome Store  Ublocker:
Ublocker is also good, the Main thing is it consumes only 40Mb of Memory only,

Task manager:

Same as chrome, the chromium also has an own Task manager,

press theshift+Esc button, then it pops up the task manager window, 

That task manager clearly shows the list of Memory usage and network usage in this list, If you find any unusual usage click the End process button.

Tabs:

The number of tabs you are using is the main reason for over memory usage and speed issues. Not all the page consume high memory, some of the page example screenshot here

Extension Manager:

We can use a multiple extension in same time, but not all the extension is essential every time,

Using some Extension switcher extension
An example Extensions Manager (aka Switcher) this add-on really helpful for switch on and off in extension

Get the Extension In this link:  Extensions Manager-Chrome store

I hope this post solve your high RAM consume in chromium in Ubuntu systems, If I found best alternatives in future I definitely update this blog, keep following this blog.

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[Solved] Linux mint, Ubuntu audio problem

The Linux operating systems gets a gradual increase of  user base level and also it improves user-friendly interface and other essential components like windows 

But anyway still some Linux users Face some problems in our systems, Most common was audio problem, sometimes the sound will be muted automatically, 

The audio problem-related questions are most frequently question in Linux and ubuntu forums, somebody gets a solution or but still few struggled with this problem. I am also facing this problem in past weeks, afterwards, I can find the one solution

In this post, I am sharing how to fix audio problem in Linux mint or Ubuntu systems

Restart Alsamixer :

Alsa mixer (Advanced Linux Sound Architecture ) is a Graphical mixer program used in Linux Mint and Ubuntu systems, sometimes it may be worked incorrect, so at this time the audio problems will be occur

So try to Restart the program by using this command in terminal:

                                                    Sudo alsa force-reload 

Now test any media file  is working correctly 

To check is automute is enable:

Some time in  alsa mixer, feature of "automute" is enabled in automatically, it is used to automatic mute your audio

Resolve:

Open your terminal, and type  alsamixer   then enter 

In alsamixer interface Check the automute is enabled or disable, as it enables to change "Disable"

 afterwards, check if the sound is working correctly

Check all the bar is up:

Most of the time the audio problem will occur on after insert or remove the headphones in your system

So open your alsamixer interface check if it all the graphical bars are in high.

Other:

 If cannot solve your problem try other solution like you installed pulse audio correctly 

Or go to Sound setting and ensure all the settings are correctly

and check your Media Player settings, VLC is the best media player in Linux platforms and supports more media codecs.  

Thank for reading my blog, I hope this post solve your audio problem in Linux mint, ubuntu systems, place your comments in the comments section 

  

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