One Time Secret (https://onetimesecret.com/) is a website that allows you to send sensitive information such as passwords or access keys to other people more securely than via email.
1) Enter the password or key you would like to share in the "Secret content goes here..." section.
2) Enter a passphrase. This is like a password for the person who will be receiving the secret can use to unlock it.
3) Lifetime is the expiry that the link One Time Secret will produce will last for. We recommend setting it to 3 days.
4) Click on "Create a secret link"
5) Copy the "Share this link" address and paste it in an email, along with the passphrase you have selected.
The person on the other end will be able to use the link and the passphrase to unlock the secret and view the contents.