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0 votes
1 answer
6k views

Putty on client - error couldn't agree a key exchange algorithm

My issue is that I have a putty client on a windows machine, trying to ssh to a Linux server (CentOS). The putty version is very old and it is NOT possible to take a newer version. I would like to ...
Jey10's user avatar
  • 103
18 votes
1 answer
23k views

How to check if your ssh keys are in the ssh-rsa2 format?

So recently there were news of OpenSSH dropping support for SHA-1 logins and I am trying to understand which format they are referring to. Since years i've been generating keys via ssh-keygen -t rsa -...
strudelj nudelj's user avatar
0 votes
1 answer
104 views

SSH-256/512 RSA taking "long" to login

Up to now, I have been using putty + pageant 0.66 to ssh from my Win 10 client to a couple of Linux servers, as in Comp A Comp B Comp C Win 10, Msys2 --...
sancho.s ReinstateMonicaCellio's user avatar
32 votes
1 answer
63k views

How to check SSH key version locally

In general i'm searching for a method to show information about a private or public SSH key without contacting a server, like keylength, algorithm, ssh version and so on. Especially I like to know if ...
gogan's user avatar
  • 423
2 votes
1 answer
5k views

How reliable are SHA1 sum and MD5 sums on very large files?

I constantly transfer disk images and virtual machine images (usually 800GB to nearly 1 TB per file) to a cloud server via rclone using SSH, and I wonder how reliable are sha1sum and md5sum when it ...
Loo Soo Yong's user avatar