👤 SUVANKAR SARKAR •
📅 April 5, 2026 •
👁️ 62 views
• 🔄 Updated May 16, 2026
Password is the least but basic security while connecting to a remote system specially with ssh, that was the reason why we created DSA. later on RSA and ed25519. why do i think ed25519 still ok.
```
ssh-keygen -t ed25519 -C "
[email protected]"
```
Password can be guessed or brutforced but sshKey is a mathametical wall. we thikn computers are good at computing or mathematics - that is not true, that is the reason why sshKey is based on Cryptography and Cryptography is based on mathametics. Remember as the password you can mishandle sshKeys also. there is no proof fo sshkey break but mishandled or claimed to be weak.
lets get a simplest example: multiplecation of 2 prime number 10007 X 10069 = 100760483, now i have 3 numbers, suppose i provide 2 number to a computer and ask about the 3rd number it will be a time consuming mathametical calculation and it grows exponentially as the number grows, then it becomes expensive and timeconsuming to break it.
now we know digital computers sucks at math, lets discuss about simulation: generic digital computers also weak at simulation but quantum computers are very good at it. most importantly google declared quantum supremacy in 2019 by doing some problem solving, but it is important to remember "theoretical problem solving" not real world application or problems. so it is a guess that quantum computers will be so efficient in number crunching in near future(5 /10 years).
what i understand even the quantum computer met the number crunching criteria we have fail2ban. some of us thinks it will be cleaver enough to break in one go - that i do not by.
next topic is hardware based self distructable file system.
so do not mis handle keys as digital keys can be copied without a trace, glory to ed25519 and relax.
