{"id":78587,"date":"2025-11-04T16:19:42","date_gmt":"2025-11-04T16:19:42","guid":{"rendered":"http:\/\/bangla.sitestree.com\/?p=78587"},"modified":"2025-11-04T16:19:43","modified_gmt":"2025-11-04T16:19:43","slug":"ssh-interaction-from-ai-tools","status":"publish","type":"post","link":"http:\/\/bangla.sitestree.com\/?p=78587","title":{"rendered":"SSH Interaction from AI Tools"},"content":{"rendered":"\n<p><\/p>\n\n\n\n<p><strong>From AI Tools as is (We feed the steps initially):<\/strong><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>Absolutely! I\u2019ve updated the IP addresses, ephemeral port, and rewritten sentences for clarity while keeping it WordPress-friendly and SEO-ready. Here\u2019s the refreshed version:<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udd10 SSH Interaction and Session Establishment Explained<\/h2>\n\n\n\n<p>Secure Shell (SSH) is the standard protocol for connecting securely to remote machines over a network. Let\u2019s break down how an SSH session starts and how encryption keeps your data safe.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83d\udeaa Step 1: Initiating the SSH Connection<\/h3>\n\n\n\n<p>Every SSH session begins with the <strong>client<\/strong>. In our example, the client has the IP <strong>10.0.5.23<\/strong>.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>The client sends a <strong>TCP SYN<\/strong> message to the SSH server to request a connection.\n<ul class=\"wp-block-list\">\n<li><strong>SYN<\/strong> stands for \u201csynchronize\u201d \u2014 basically, \u201clet\u2019s start communicating.\u201d<\/li>\n\n\n\n<li>The client uses a <strong>temporary (ephemeral) port<\/strong> such as 49,872.<\/li>\n\n\n\n<li>The server listens on <strong>port 22<\/strong>, the standard SSH port.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<p>Think of it as knocking on a door:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u201cHello SSH server, can we start a secure conversation?\u201d<\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83e\udd1d Step 2: The TCP Three-Way Handshake<\/h3>\n\n\n\n<p>The server responds with <strong>SYN + ACK<\/strong>, meaning \u201cI heard you and I\u2019m ready.\u201d The client replies with <strong>ACK<\/strong> to confirm.<\/p>\n\n\n\n<p>This <strong>three-way handshake<\/strong> ensures both sides are synchronized. Without it, no secure communication can occur.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83e\udde9 Step 3: SSH Version Exchange<\/h3>\n\n\n\n<p>After TCP is ready, both sides exchange their SSH versions:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Client:<\/strong> \u201cI support SSH-2, OpenSSH 8.1p1 (Debian).\u201d<\/li>\n\n\n\n<li><strong>Server:<\/strong> \u201cI also support SSH-2, OpenSSH 8.9p1 (Debian).\u201d<\/li>\n<\/ul>\n\n\n\n<p>This ensures compatibility and prevents protocol mismatches.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83d\udd11 Step 4: Key Exchange Initialization<\/h3>\n\n\n\n<p>Encryption setup begins here:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The <strong>client<\/strong> sends a <strong>Key Exchange Init<\/strong> message, listing supported algorithms for encryption, authentication, and compression.<\/li>\n\n\n\n<li>The <strong>server<\/strong> responds with its preferences.<\/li>\n\n\n\n<li>Both negotiate to select compatible algorithms.<\/li>\n<\/ul>\n\n\n\n<p>Common algorithm choices:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Encryption:<\/strong> <code>aes256-gcm<\/code><\/li>\n\n\n\n<li><strong>Authentication:<\/strong> <code>hmac-sha2-256<\/code><\/li>\n\n\n\n<li><strong>Compression:<\/strong> <code>none<\/code> (often disabled for security)<\/li>\n<\/ul>\n\n\n\n<p>This step guarantees both sides \u201cspeak the same security language.\u201d<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83e\uddee Step 5: Diffie\u2013Hellman Key Exchange<\/h3>\n\n\n\n<p>SSH uses <strong>Diffie\u2013Hellman (DH)<\/strong> to generate a shared session key without sending it in plain text.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The <strong>client<\/strong> sends a random number <strong>e<\/strong> (32 bytes).<\/li>\n\n\n\n<li>The <strong>server<\/strong> responds with its random number <strong>f<\/strong> (32 bytes).<\/li>\n<\/ul>\n\n\n\n<p>Both compute the <strong>shared session key independently<\/strong>. Once complete:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The <strong>server<\/strong> sends a <strong>New Key<\/strong> message indicating encryption is active.<\/li>\n\n\n\n<li>The <strong>client<\/strong> confirms with its own <strong>New Key<\/strong> message.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83e\uddf0 Step 6: Encrypted Communication<\/h3>\n\n\n\n<p>From here onwards:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>All traffic is encrypted<\/strong> using the shared session key.<\/li>\n\n\n\n<li><strong>Message Authentication Codes (MACs)<\/strong> ensure data integrity.<\/li>\n\n\n\n<li>Even <strong>packet sizes<\/strong> are hidden to prevent traffic analysis.<\/li>\n<\/ul>\n\n\n\n<p>Every command, file, or password sent is protected from eavesdropping.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83d\udd12 Summary of SSH Flow<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>TCP handshake<\/strong> \u2013 establish connection.<\/li>\n\n\n\n<li><strong>Version exchange<\/strong> \u2013 agree on SSH version.<\/li>\n\n\n\n<li><strong>Key exchange init<\/strong> \u2013 select encryption algorithms.<\/li>\n\n\n\n<li><strong>Diffie\u2013Hellman exchange<\/strong> \u2013 generate shared key.<\/li>\n\n\n\n<li><strong>New key confirmation<\/strong> \u2013 enable encryption.<\/li>\n\n\n\n<li><strong>Secure session<\/strong> \u2013 all communication is encrypted and verified.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83e\udde0 Final Thoughts<\/h3>\n\n\n\n<p>SSH combines <strong>authentication, encryption, and integrity checks<\/strong> to provide secure remote administration. Once the session key is set up, both client and server use it to encrypt and decrypt all traffic, keeping communication private even over insecure networks.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\ud83d\udeaa<\/p>\n","protected":false},"excerpt":{"rendered":"<p>From AI Tools as is (We feed the steps initially): Absolutely! I\u2019ve updated the IP addresses, ephemeral port, and rewritten sentences for clarity while keeping it WordPress-friendly and SEO-ready. Here\u2019s the refreshed version: \ud83d\udd10 SSH Interaction and Session Establishment Explained Secure Shell (SSH) is the standard protocol for connecting securely to remote machines over a &hellip; <\/p>\n<p><a class=\"more-link btn\" href=\"http:\/\/bangla.sitestree.com\/?p=78587\">Continue reading<\/a><\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[1978],"tags":[],"class_list":["post-78587","post","type-post","status-publish","format-standard","hentry","category-computer-networks","item-wrap"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":78585,"url":"http:\/\/bangla.sitestree.com\/?p=78585","url_meta":{"origin":78587,"position":0},"title":"SSH","author":"Author-Check- Article-or-Video","date":"November 4, 2025","format":false,"excerpt":"From AI tools as is \ud83d\udd10 Understanding SSH (Secure Shell): How It Works and Why It Matters When you connect to a remote server or transfer files securely over the internet, you\u2019re likely using SSH \u2014 Secure Shell. SSH has become the standard protocol for secure communication between computers, system\u2026","rel":"","context":"In &quot;Computer Networks&quot;","block_context":{"text":"Computer Networks","link":"http:\/\/bangla.sitestree.com\/?cat=1978"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":14027,"url":"http:\/\/bangla.sitestree.com\/?p=14027","url_meta":{"origin":78587,"position":1},"title":"SSH\/SSHD\/OpenSSH in CentOS\/Redhat Linux","author":"Sayed","date":"December 24, 2017","format":false,"excerpt":"Experiment with SSH\/SSHD\/OpenSSH in CentOS\/Redhat Linux Yes, from\u00a0 my history (Probably a review for the technical people, who already knew these sometimes in the past) 461 echo \"dec 24th, 2017\" 462 vim \/etc\/ssh\/sshd_config 463 echo \"SSH Related Commands\" 464 scp -> secure copy 465 tscp -> secure copy for windows\u2026","rel":"","context":"In &quot;\u09b2\u09bf\u09a8\u09be\u0995\u09cd\u09b8 \u098f\u09ac\u0982 \u0989\u09a8\u09bf\u0995\u09cd\u09b8 \u0964 Linux and Unix&quot;","block_context":{"text":"\u09b2\u09bf\u09a8\u09be\u0995\u09cd\u09b8 \u098f\u09ac\u0982 \u0989\u09a8\u09bf\u0995\u09cd\u09b8 \u0964 Linux and Unix","link":"http:\/\/bangla.sitestree.com\/?cat=1231"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":22776,"url":"http:\/\/bangla.sitestree.com\/?p=22776","url_meta":{"origin":78587,"position":2},"title":"Ubuntu: Creating a user with SSH access and write permission to the web-application folder #Root #By Sayed Ahmed","author":"Author-Check- Article-or-Video","date":"March 20, 2021","format":false,"excerpt":"Ubuntu: Creating a user with SSH access and write permission to the web-application folder The following Linux commands helped sudo chown -R username:username \/home\/username\/.ssh sudo chmod 0700 \/home\/username\/.ssh sudo chmod 0600 \/home\/username\/.ssh\/authorized_keys Also, added the following lines into the file \/etc\/ssh\/sshd_config -> did not check whether these are really required\u2026","rel":"","context":"In &quot;FromSitesTree.com&quot;","block_context":{"text":"FromSitesTree.com","link":"http:\/\/bangla.sitestree.com\/?cat=1917"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":67602,"url":"http:\/\/bangla.sitestree.com\/?p=67602","url_meta":{"origin":78587,"position":3},"title":"Experiment with SSH and TCP Wrappers #DevOps","author":"Author-Check- Article-or-Video","date":"July 25, 2021","format":false,"excerpt":"The idea was : use two servers; server1, and server2 create user: user1 in both server1 and server2 use nmtui to assign IP Addresses to both use ifdown and ifup to check if IPs are assigned properly change \/etc\/hosts and add the server ips and names use ping to know\u2026","rel":"","context":"In &quot;FromSitesTree.com&quot;","block_context":{"text":"FromSitesTree.com","link":"http:\/\/bangla.sitestree.com\/?cat=1917"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":24079,"url":"http:\/\/bangla.sitestree.com\/?p=24079","url_meta":{"origin":78587,"position":4},"title":"Configure a Cisco Switch for SSH Access -Part 3 username &amp; ssh client #Root","author":"Author-Check- Article-or-Video","date":"April 5, 2021","format":false,"excerpt":"From: http:\/\/sitestree.com\/?p=3055 Categories:RootTags: Post Data:2015-10-27 04:09:37 Shop Online: https:\/\/www.ShopForSoul.com\/ (Big Data, Cloud, Security, Machine Learning): Courses: http:\/\/Training.SitesTree.com In Bengali: http:\/\/Bangla.SaLearningSchool.com http:\/\/SitesTree.com 8112223 Canada Inc.\/JustEtc: http:\/\/JustEtc.net (Software\/Web\/Mobile\/Big-Data\/Machine Learning) Shop Online: https:\/\/www.ShopForSoul.com\/ Medium: https:\/\/medium.com\/@SayedAhmedCanada","rel":"","context":"In &quot;FromSitesTree.com&quot;","block_context":{"text":"FromSitesTree.com","link":"http:\/\/bangla.sitestree.com\/?cat=1917"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":67791,"url":"http:\/\/bangla.sitestree.com\/?p=67791","url_meta":{"origin":78587,"position":5},"title":"Misc. on AWS, Linux, Git, SSH, Development Platform #By Sayed Ahmed #Misc. Reading #RHCSA","author":"Author-Check- Article-or-Video","date":"July 28, 2021","format":false,"excerpt":"Restart MySQL server on MacOS https:\/\/coolestguidesontheplanet.com\/start-stop-mysql-from-the-command-line-terminal-osx-linux\/ Ubuntu: http:\/\/askubuntu.com\/questions\/82374\/how-do-i-start-stop-mysql-server Macos: sudo apachectl start Redhat: https:\/\/access.redhat.com\/documentation\/en-US\/Red_Hat_Enterprise_Linux\/6\/html\/Managing_Confined_Services\/chap-Managing_Confined_Services-MySQL.html SSH, Secure copy (SCP), Sync (rsync) with Amazon AWS (Sure I did work with and used the following concepts) Sure, did configure development and deployment platform on AWS This works: ssh -i \/path\/my-key-pair.pem ec2-user@ec2-198-51-100-1.compute-1.amazonaws.com you might\u2026","rel":"","context":"In &quot;FromSitesTree.com&quot;","block_context":{"text":"FromSitesTree.com","link":"http:\/\/bangla.sitestree.com\/?cat=1917"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/img.youtube.com\/vi\/PLUA7SYgJYDFqYR7YRow8cwX_RSgTJPCQH\/0.jpg?resize=350%2C200","width":350,"height":200},"classes":[]}],"_links":{"self":[{"href":"http:\/\/bangla.sitestree.com\/index.php?rest_route=\/wp\/v2\/posts\/78587","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/bangla.sitestree.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/bangla.sitestree.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/bangla.sitestree.com\/index.php?rest_route=\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"http:\/\/bangla.sitestree.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=78587"}],"version-history":[{"count":1,"href":"http:\/\/bangla.sitestree.com\/index.php?rest_route=\/wp\/v2\/posts\/78587\/revisions"}],"predecessor-version":[{"id":78588,"href":"http:\/\/bangla.sitestree.com\/index.php?rest_route=\/wp\/v2\/posts\/78587\/revisions\/78588"}],"wp:attachment":[{"href":"http:\/\/bangla.sitestree.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=78587"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/bangla.sitestree.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=78587"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/bangla.sitestree.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=78587"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}