From f6d92eb7d47828fe3d95f4c056c99816b973195b Mon Sep 17 00:00:00 2001
From: wakgill <76528604+wakgill@users.noreply.github.com>
Date: Mon, 4 Jan 2021 20:42:25 -0600
Subject: [PATCH] Create 29.md

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 create mode 100644 docs/forum/bitcoin-forum/29.md

diff --git a/docs/forum/bitcoin-forum/29.md b/docs/forum/bitcoin-forum/29.md
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+---
+layout: forum
+title: 'Re: A newb's test - anyone want to buy a picture for $1?'
+grand_parent: Forum Posts
+parent: Bitcoin Forum
+nav_order: 29
+date: 2010-01-28 01:01:48 UTC 
+original: https://bitcointalk.org/index.php?topic=25.msg159#msg159
+---
+
+# Re: A newb's test - anyone want to buy a picture for $1?
+
+---
+
+```
+Re: A newb's test - anyone want to buy a picture for $1?
+January 28, 2010, 01:01:48 AM
+
+Yes, it's a technical limitation.  Sending by bitcoin address enters the transaction into the network and the recipient discovers it from the network.  You don't connect directly with them and they don't have to be online at the time.
+
+I very much wanted to find some way to include a short message, but the problem is, the whole world would be able to see the message.  As much as you may keep reminding people that the message is completely non-private, it would be an accident waiting to happen.
+
+Unfortunately, ECDSA can only sign signatures, it can't encrypt messages, and we need the small size of ECDSA.  RSA can encrypt messages, but it's many times bigger than ECDSA.
+```