https://learn.microsoft.com/en-us/sharepoint/what-s-new-in-sharing-in-targeted-release?redirectSourcePath=%252farticle%252fcc78357c-6d48-499c-9cc7-dae447d0d391
Secure external sharing in SharePoint - SharePoint in Microsoft 365 | Microsoft Learn
In SharePoint, if you share with a user who isn't in the directory, they're sent a one-time code that they can use to verify their identity.
secure external sharingsharepointmicrosoftlearn
https://www.techradar.com/news/software/business-software/file-sharing-s-red-herring-secure-external-communication-1255112
File sharing's red herring: secure, external communication | TechRadar
Jun 28, 2014 - How to share data externally with minimal risk
file sharingred herringexternal communicationsecuretechradar
https://help.zoho.com/portal/es/community/topic/secure-your-external-sharing-process-with-otp-authentication?page=2
Secure your external sharing process with OTP Authentication
For any business, it's crucial to share files externally in a way that is both secure and controlled. Let's say you want to share confidential data with your...
external sharingsecureprocessotpauthentication