1

Is there a way to exchange phone numbers/email addresses through public chats with a person without giving them or other communication information away to all the other people in the public chat?

Example for a public chat can be the comments to this post right here.

  • Some chat systems have support for the OTR (Off-The-Record messaging) protocol. – forest Aug 2 at 6:39
2

Using an asymmetric encryption.

  • Create a public/private key pair.
  • Share the public key in chat
  • Now someone can send data to chat encrypted with your public key.
  • Data can only be decrypted with your private key no body but you can read it.

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