> all users are now required to use an ssh keypair for login, or will be required to proceed with manual account recovery with [~ben](/~ben/) or another admin. drop a line to [sudoers@tilde.team](mailto:sudoers@tilde.team) or hop on [irc](https://web.tilde.chat/?join=sudoers) for assistance.
while [tilde.team](https://tilde.team) is accessible on the web and features lovely web pages written by its users, all of the interaction with tilde.team takes place **inside the machine** that runs tilde.team as opposed to via web forms that have an effect from **outside** tilde.team's computer.
this is what sets tilde.team apart from most other online communities. you connect directly to another computer from yours alongside other people and then write your web pages, chat, and play games all via text-based interfaces right on tilde.team's computer.
prior to the web (which debuted in 1995) this is how pretty much all computer stuff got done. you connected directly to a machine (usually over a direct, physical phone line) and did your work there.
for a long time, people used a tool called [`telnet`](https://en.wikipedia.org/wiki/telnet) to connect to other computers. these days we use a tool called **ssh**.
`ssh` is a text-based tool that provides a direct connection from your computer to another. ssh is an acronym that stands for secure shell. the *shell* part refers to the fact that it's a text-based tool; we use the word shell to refer to a text-based interface that you give commands to. the *secure* part refers to the fact that, when you're using ssh, no one can spy on your connection to another computer (unlike the old `telnet` command).
**why bother with all of this?** passwords are really insecure and hard to manage. using keys makes life easier for you, fair user (your account is less likely to be hacked) and for me, your humble sysadmin (less administration than passwords).
SSH supports a handful of types of cryptographic keys. The most used are [RSA](https://en.wikipedia.org/wiki/RSA_(cryptosystem)) and the more modern [Ed25519](https://en.wikipedia.org/wiki/EdDSA#Ed25519).
RSA is the de-facto standard and is supported everywhere (just choose a big enough key like 4096bits to be secure). Ed25519 is designed to be faster and smaller withouth sacrificing security, so is best suited for embedded devices or machines with low resources. It's supported on tilde (and really on anymodern system) but you may find older systems which do not support it.
A good solution is to provide a password for them at creation time, but this implies entering a password any time you used them (impractical) or use something like [ssh-agent](https://man.openbsd.org/ssh-agent.1) (a bit more complex)
We don't have documentation for this [(yet)](https://tildegit.org/team/site/src/branch/master/wiki) so either go with no password keys, or ask on IRC (#team) for help.
1. if you press enter to accept the defaults, your public and private key will be located at `~/.ssh/id_rsa.pub` and `~/.ssh/id_rsa` respectively (or `~/.ssh/id_ed25519.pub` and `~/.ssh/id_ed25519` if you chose ed25519 type)
1. copy the output of the last command and paste it in the sshkey field on the signup form (or email it to [~sudoers](mailto:sudoers@tilde.team) if you already have an account)
1. if you press enter to accept the defaults, your public and private key will be located at `~/.ssh/id_rsa.pub` and `~/.ssh/id_rsa` respectively (or `~/.ssh/id_ed25519.pub` and `~/.ssh/id_ed25519` if you chose ed25519 type)
1. copy the output of the last command and paste it in the sshkey field on the signup form (or email it to [~sudoers](mailto:sudoers@tilde.team) if you already have an account)
there are a lot of linux distros, but `ssh` and `ssh-keygen` should be available in almost all cases. if they're not, look up how to install ssh for your distro.
1. if you press enter to accept the defaults, your public and private key will be located at `~/.ssh/id_rsa.pub` and `~/.ssh/id_rsa` respectively (or `~/.ssh/id_ed25519.pub` and `~/.ssh/id_ed25519` if you chose ed25519 type)
1. copy the output of the last command and paste it in the sshkey field on the signup form (or email it to [sudoers@tilde.team](mailto:sudoers@tilde.team) if you already have an account)
this tutorial is based on and uses parts of [the tilde.club ssh primer](https://github.com/tildeclub/tilde.club/blob/master/docs/ssh.md) and [the tilde.town ssh guide](https://tilde.town/wiki/ssh.html).