School Of Basics | What is SSH | How SSH works

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Hi, I am Raghav and today we will learn -
What is SSH
How SSH Works
Why SSH was created
SSH Client
SSH Server
SSH Authentication
Public & Private Keys
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[@svetanayanr8930]

It is like.. I have a doubt.. i come to your channel with 0 knowledge.. search the keyword.. get it here.. and i definetely go back with a good content.. You are actually creating livelihoods for people with your knowledge.. (PS: and then i show off my knowledge :D ha ha) Thanks a lot.. please continue educating us..!!

[@RaghavPal]

So humbled to read your message Sveta

[@michaelrider9067]

Today was my first day on the job as a junior dev(just transitioned careers ), and SSH kicked my butt while I was trying to set up my dev environment. I've spent my afternoon after work watching videos and researching SSH. This is easily the best video on SSH. Thank you for sharing this information with the community.

[@RaghavPal]

So happy to know it

[@anakie9660]

true this one helped me a lot

[@JPH-ps6ic]

Raghav - thank you for this video. It is super helpful to me. But I have one question about the two key process. At 9:51 in the video, this makes sense, but I recently saw a different video describing it in this way -> Step 1: Client sends connection request to Server. Step 2: Server sends Client a random string that is encrypted using the Public Key Step 3: Client DECRYPTS this random string using the Private Key, and sends back information to the Server that proves that it indeed decrypted it. Step 4: Server authenticates this information. As you can tell, this process that I described is similar, but the client does the decrypting. In your video, Step 3 shows the client ENCRYPTING the message for the SERVER to decrypt. I wanted to ask you if both processes are viable, and if they have different names, or if one of these processes is incorrect. Trying to sort this stuff out while learning about SSH and any input would be greatly appreciated!

[@RaghavPal]

JP Let's delve into the intricacies of SSH key-based authentication. It's great that you're exploring this topic, and I'll clarify the processes for you. 1. SSH Key Pair Generation: - Client: The client generates an SSH key pair consisting of a public key and a private key. - Public Key: The public key is shared with the server. - Private Key: The private key remains securely on the client machine. 2. Server Configuration: - The server stores the client's public key in a special file (usually `~/.ssh/authorized_keys`). - The server marks the public key as approved for authentication. 3. Authentication Process: - When the client connects to the server: - The server sends a random string to the client. - The client encrypts this random string using its private key. - The client sends the encrypted string back to the server. - The server decrypts the received string using the public key. - If successful, the server authenticates the client. Now, let's address the difference you noticed: - Your Description: - The client decrypts the random string using its private key. - The client then sends back information to the server. - The server authenticates based on this information. - Video Description (as per your observation): - The client encrypts the random string using its private key. - The server decrypts the received string using the client's public key. - If successful, the server authenticates the client. Both processes are viable and achieve the same goal: secure authentication using SSH keys. The video's approach emphasizes the client's role in encrypting the message, while your description highlights the client's role in decrypting it. These are two sides of the same cryptographic coin In summary, both methods are correct, and they don't have different names. The key pair ensures secure communication, and the specific steps may vary slightly in how they're described Keep exploring, and feel free to ask more questions as you learn..

[@AbdulRehman-pc2xx]

From Lahore Pakistan. ALLAH bless you, Ameen. You explained this SSH in a very super duper easy way. And Yes Sir please stay home and stay safe. MAY ALLAH take India out from this hell situation Ameen.

[@PrabasPerspective]

The Day begins with your video about SSH. It was awesome and clear explanation with example. Thanks Raghav.

[@RaghavPal]

Most welcome!

[@scottrussell6873]

Thank you! I finally understand how public/private key encryption works!

[@RaghavPal]

Glad it helped Scott

[@arun53413]

Hi Raghav, It was a good Explanation. You are doing a Great Job of sharing your knowledge which is helping many of us. Keep up the Good Work !!

[@RaghavPal]

Most welcome Arun

[@sundarmishra561]

Thank you for providing this great resource. Very grateful to you.🤝👏👏

[@RaghavPal]

Most welcome Sundar

[@jaikishank]

Thanks for the clear explanation in the video. Deeply appreciate your knowledge sharing...

[@RaghavPal]

Glad it was helpful Jaikishan

[@RachitMalvi]

Thank you, Raghav. Great expalination!

[@RaghavPal]

Most welcome Rachit

[@hariprasath838]

Thank you so much sir. I heard this term yesterday. And I can say now, that I know that how SSH is working in basic level. I loved the way you had explained using transferring locked box between two friends. Thank you so much sir:)

[@RaghavPal]

Excellent Hari

[@nandhinirajendran1396]

You are my guru for years 🙏🏼🙏🏼🙏🏼🙏🏼

[@RaghavPal]

Humbled to know this Nandhini

[@tomriddle2427]

Brilliant it was the way you explained can't be any simpler, thank-you

[@RaghavPal]

You're welcome!

[@madhavans8442]

please continue educating us.Thanks!

[@RaghavPal]

Most welcome Madhavan

[@grigoriyz]

Thank you for easy explanation! Good job!

[@RaghavPal]

Most welcome

[@dayanandswami8109]

really, this box example now clear the funda of ssh that how it is secure & how it works. Thanks for making this valuable video.

[@RaghavPal]

Glad it helped Dayanand

[@bandlamudi1206]

Really a nice video, I did watch few videos so far, did not get clear idea about ssh process. The way you presented the topic is awesome. Thank you Raghav

[@RaghavPal]

You are most welcome

[@karthiknarayan8]

Thank you for the simple explanation..really helpful.🙏

[@RaghavPal]

Most welcome

[@santoshbehera9261]

Thank you for getting the knowledge from you I searched for.

[@RaghavPal]

Most welcome Santosh

[@toallin150]

Thank you Raghav 🙌 . Great explanation!

[@RaghavPal]

Glad it was helpful!

[@sandeep87raju]

Such a wonderful explanation Raghav. You are a great guy :)..

[@RaghavPal]

Thanks for watching Sandeep

[@saifuddinraj8774]

Awesome explanation. Thank you 😊

[@RaghavPal]

Most welcome Saifuddin

[@biswabhusanswain7528]

Thanks for clearing my doubt 🙏🙏🙏

[@RaghavPal]

Most welcome Biswa

[@codenexa1666]

It is simply an amazing overview, On point explanation. Thanks for sharing amazing information. Keep uploading this kind of informative videos for us.

[@RaghavPal]

So nice of you

[@neelakantannilakantanswami4031]

Thanks for the info . Keep continuing your good work

[@RaghavPal]

Thanks, will do!

[@radhikarao5106]

Great Explanation! Can you please explain how SSL and SSL certs work with an analogy? If you can show us how to Create and replace certs in a server that would be great!!

[@RaghavPal]

Sure Radhika, I will plan a session

[@whattheydoexactly7794]

thank you for such wonderful explanation

[@RaghavPal]

Most welcome Nachiket

[@ayushpatel2171]

Nice explanation sir thank you very much.

[@RaghavPal]

You are most welcome Ayush

[@ThePuneet681]

Simple and clear explanation, thanks 🙏

[@RaghavPal]

Glad it was helpful!

[@rageshnc]

Thank you for the short but clear explanation....

[@RaghavPal]

Glad it was helpful Ragesh

[@shadow_self8564]

Beautifully explained. Thanks

[@RaghavPal]

Most welcome Saurabh

[@ekleanthony7735]

Nice video.. Thanks for the explicit and careful explanation.

[@RaghavPal]

Glad it was helpful

[@sophiyaanudeep9397]

Miraculous explanation... crystal clear...

[@RaghavPal]

Thanks Sophiya

[@shaikhanuman8012]

Great Content sir. Tq for providing.

[@RaghavPal]

Always welcome

[@dineshdewangan8390]

Great sir, Waiting for next..

[@RaghavPal]

Will be coming next week Dinesh

[@KisiselBilgi]

it's absolutely great explain 👏👏👏

[@RaghavPal]

Glad it was helpful!

[@JohnJohnson-sf5wl]

Thanks for the simple explanations

[@RaghavPal]

You're welcome John

[@kommuram5435]

Hi Raghav, thanks for the valuable info. Can you please explain how ssl works and how to setup on aws and Onpremise servers

[@RaghavPal]

I will plan for that Ram

[@kommuram5435]

@@RaghavPal thanks Raghav

[@vitteshwarayaramanavenky2187]

Explained very well,I thanking you sir

[@RaghavPal]

You are welcome

[@rogerthat7190]

Thank you sir for the clear explanation

[@RaghavPal]

Most welcome

[@mahimahesh5616]

It would be helpful if u make videos to clear interviews explaining real time scenerios

[@RaghavPal]

I will do

[@mohammadahmedragab837]

thank you so much , great explanation

[@RaghavPal]

Most welcome Ahmed

[@jimmelbermudez]

Thank you very much Sir . Your student from Philippines ☺️

[@RaghavPal]

You are very welcome Jimmel

[@GaneshNayak]

Too good man.. very well explained..

[@RaghavPal]

Thanks a ton Ganesh

[@shrutibansal5261]

Great video

[@luckyadeloye3452]

Thank you so much for this video and the link to the conversation between mickey and minnie on ssh.

[@RaghavPal]

Most welcome Lucky

[@elaveniltharumarasan5484]

Very nicely done! Thank you!

[@RaghavPal]

Most welcome Elavenil

[@rajeeshnangariyil3600]

These information are gold dust

[@RaghavPal]

Thanks Rajeesh

[@kamaleshpramanik7645]

This is superb ... Thank you very much Sir.

[@RaghavPal]

You are most welcome Kamalesh

[@NehaYT]

Very well explained sir 🎉

[@RaghavPal]

Thanks and welcome Neha

[@yavdhesh]

dhanywaada guruji

[@RaghavPal]

Most welcome Yogesh

[@srikanthgandhi7289]

Very clear Explanation. 🙏 thanks lot

[@RaghavPal]

Most welcome Srikanth

[@wmchow8943]

Very well explained and used Git as example make it more easy to understand

[@RaghavPal]

Thanks a lot

[@kedardeuskar3865]

Nice Explanation of SSH

[@RaghavPal]

Glad it was helpful Kedar

[@poojagupta-nk7rq]

sir you are simply best i am working past 1 year but today i understood exact scene thankyou my teacher

[@RaghavPal]

You are most welcome Pooja

[@RahulWalli]

Thank you so much for this video 💓

[@RaghavPal]

Most welcome 😊

[@MiraclesU123.]

Nice and simple explanation!

[@RaghavPal]

Glad it was helpful!

[@odunayokomolafe9485]

Great presentation!

[@RaghavPal]

Thanks for watching Odunayo

[@xyz123636]

Your all videos are very helpful. If possible, please create few videos for shell scripting topic. Thanks for creating nice videos, God bless

[@RaghavPal]

Sure, I will do

[@tulasiramsunkara]

Excellent explanation 👌👏👏👏👏

[@RaghavPal]

Thanks for watching Tulasi

[@eugenegorodetsky6494]

thanks ! really helpfull

[@RaghavPal]

Most welcome Eugene

[@arunprasad8261]

nice lecture on SSH. thanks

[@RaghavPal]

Most welcome Arun

[@canadatorontovideos7283]

Kindly need a step by step video on automation testing about azure data lake/factory/blob etc.

[@RaghavPal]

Will check on this Suhasini

[@canadatorontovideos7283]

@@RaghavPal thank you raghav

[@vaibhavppandey]

Very good explanation sir. Thank you very much :)

[@RaghavPal]

You are most welcome

[@tanveersyed1049]

Thanks ...Nice explanation

[@RaghavPal]

You are welcome Tanveer

[@arunbandari8936]

Hi Sir In Password-based authentication, if I enter a password and click on ENTER button. Now hackers may see my password in between the client and server channel. when the secure connection will be open, after the correct password providing or before.

[@RaghavPal]

Hi Arun, will check on this

[@arunbandari8936]

@@RaghavPal hi sir did you got any information?

[@vetribull8318]

Hi Raghav, Thank you very much for your explanation. Got any chances to migrate openssh key from windows to another windows ?

[@RaghavPal]

Not yet, will need to check online

[@vetribull8318]

@@RaghavPal Thanks Raghav

[@ravimohanboggula8117]

NICE Job Raghav like the series school of basics, I would appreciate if you could discuss about Installing SSL certificates and how they work too

[@RaghavPal]

Sure Ravi, Keep learning

[@Manish_Kumar_Bihar]

nice sir ,u explain very well!!!

[@RaghavPal]

Thanks and welcome Manish

[@vkrishna606]

well explained

[@RaghavPal]

Thanks Vamsi

[@MahaPSaranu]

Bless you Raghav. So simple and useful explanation. Please could you also explain about Putty ?

[@RaghavPal]

I will do Peddi

[@anuragsandhu9590]

Amazing

[@RaghavPal]

Thanks for watching

[@chaitanyakrishna9398]

So helpful.

[@RaghavPal]

Glad it was helpful Chaitanya

[@abdul9910]

I like a lot your videos keep going on

[@RaghavPal]

Thanks, will do Abdul

[@devyetii]

Thank you Raghav ❤️. I've a question .. can't a man in the middle steal this "box" of info by attaching his key ? Is there any check on the sent key ?

[@RaghavPal]

Hi Ebrahim, the person needs to have the authentic private key. Also it is recommended to secure your private key with password, so just in case someone gets access to you private key, he will still need to provide password to use it.

[@devyetii]

@@RaghavPal Got it! Many thanks for your reply 💜

[@sarthakgupta7955]

does the two lock mechanism happen in every message exchange?

[@RaghavPal]

Hi Sarthak Both these mechanisms are performed during the initial setup phase of an SSH session, and are not repeated in every message exchange. However, they are in place throughout the duration of the SSH session to ensure message integrity and prevent packet loss due to interleaving.

[@manojkumarneesu2773]

in my hpc server my gpu node is showing down how to activate it using ssh commands can you please tell me

[@RaghavPal]

Hi Manoj, I will need to check details

[@BlokeBritish]

u say tat the security is coz of encryption. so if not encrypted then wat exactly is the risk ? do u mean a hacker cn use some tools to do network sniffing and get access to the data or sumthing like tat ?? coz im new to all this and im confused wen i hear things like "not secure" ive also heard tat in http vs https

[@RaghavPal]

Hi Czar, yes so without encryption it will be a step easier for hackers, I am going a plan a security testing Q&A soon. that will help

[@BlokeBritish]

@@RaghavPal thanks man

[@singaravelann3671]

If in server we have a more number of public keys how the server identifies using which key it should decrypt the message??

[@RaghavPal]

Hi Singaravelan, there is cryptographic fingerprint that is used to uniquely identify the keys.

[@abhaypatidar7948]

Hello Sir, I watched your video to understand the ssh. I have a doubt over the flow that you explained in the last. As we know that ssh uses public-key cryptography where a message encrypted using public can only be decrypted by its private key. But in your flow, at last, you said that the client encrypts the message sent by the server with the private key, and then sends it to the server, then the server decrypts it using the public key.

[@RaghavPal]

Hi Abhay, pls check this too - automationstepbystep.com/2020/07/23/a-story-of-ssh-secure-shell/

[@abhaypatidar7948]

@@RaghavPal Thank you sir, do we have more link that shows actually how authentication takes place.

[@RaghavPal]

will need to search more online

[@gxp9223]

you need to make a correction. encryption happens using the public key and decryption happens using the private key

[@oguzhantopaloglu9442]

Amazing video

[@RaghavPal]

Thanks

[@avakasavaadhi4726]

May I know which port is used when 2 machines communicate over SSH?

[@RaghavPal]

default is port 22, but this can change

[@tarunarora3266]

nice introduction

[@RaghavPal]

thanks Tarun

[@aditifabregas]

How can the server (remote machine) decrypt with public key? Then the very purpose of encryption is lost.

[@RaghavPal]

I will try to add a detailed session Aditi

[@ywahab25]

good explanation my dear

[@RaghavPal]

Thank you 🙂

[@dhevanrajandran7632]

Great video :)

[@RaghavPal]

Thanks Dhevan

[@sailakshmankinthali6501]

Super explanation

[@RaghavPal]

Thanks Sai

[@toshitsingh7270]

Damm nailed the explanation 👏

[@RaghavPal]

Thanks Toshit

[@devendradhillon4204]

Good explanation

[@RaghavPal]

Thanks and welcome Devendra

[@karteeshkumarvipparapelli7347]

Main thing in SSH is related to keys.. but u explained that part in just a minute.

[@RaghavPal]

Thanks for watching Karteesh

[@priyaigu1306]

Hi Raghav, I am getting permission denied all the time when i try to enter into the machine, passwords are correct. The first step runs successfully (sequence completed) but in the very next step when i enter password, permission denied. How to solve this problem??

[@RaghavPal]

Hi Priya, will need to check your setup

[@priyaigu1306]

@@RaghavPal Please suggest a way to check setup??

[@honeybunny9977]

Do you have any video on github n gitlab for beginners?

[@RaghavPal]

Yes, pls check here - automationstepbystep.com/

[@PoornaCW]

Thank you so much

[@RaghavPal]

Most welcome Poorna

[@bharathkumarchalla3558]

thankyou so much its very small word to say....but thanks

[@NikhilSingh-hc7td]

thanks sir

[@RaghavPal]

Most welcome Nikhil

[@Rhythmicwalker]

Very nice 👍

[@RaghavPal]

Thanks for watching Prakash

[@faisalsakib9586]

Please make a video about linux , needed for testing

[@RaghavPal]

I will do Faisal

[@abdullamasud4278]

If someone has my private key, will that someone be able to encrypt the random message and access the remote system? if so, what makes it different than using a password? I am sorry if I sound naive here ^^ Just trying to understand it better

[@RaghavPal]

Hi Abdulla, this has good explanation of this concept www.ssh.com/academy/ssh/public-key-authentication sectigo.com/resource-library/what-is-an-ssh-key

[@RaghavPal]

Hi Abdulla, this has good explanation of this concept sectigo.com/resource-library/what-is-an-ssh-key www.ssh.com/academy/ssh/public-key-authentication

[@thebattinson1278]

Then u are fucked 🤣 To be serious, a private key is way more secure than a password and cannot be brute forced. U can also add a layer of security with a passphrase for your private key. So if someone stole your private key, he won't be able to use it in another machine.

[@priyapatel8711]

Nice Video :)

[@RaghavPal]

Thanks for the visit

[@honeybunny9977]

Hi Raghav....what is the difference between Putty and ZOC?

[@RaghavPal]

Hi, I have not used ZOC, Can find more here - en.wikipedia.org/wiki/Comparison_of_SSH_clients www.slant.co/versus/499/5495/~putty_vs_zoc-terminal