原始文献 / 论坛帖 / Re: We accept Bitcoins
Re: We accept Bitcoins
Bitcointalk · 2010-05-20 21:43:42 UTC
引用 DataWraith（May 19, 2010, 07:52:42 PM）（https://bitcointalk.org/index.php?topic=30.msg1161#msg1161）：
我能插个问题问下为什么吗？在我看来，既然 Bitcoin 用公钥密码学来转移币的所有权，那附上一段只有收款人能读的短消息应该是小事一桩。
差一点，但不完全是。Bitcoin 用的是 EC-DSA，它只能做数字签名，做不了加密。RSA 两样都能做，但我没用它，因为它要大一个数量级，不现实。
英文原文
Quote from: DataWraith on May 19, 2010, 07:52:42 PM（https://bitcointalk.org/index.php?topic=30.msg1161#msg1161）:
> Can I just butt in with a question on why that is? To me it seems that if Bitcoin uses public-key cryptography to transfer ownership of the coins, it should be a trivial matter to include a short message that is only readable by the recipient.
>
Almost but not quite. Bitcoin uses EC-DSA, which can only do digital signing, not encryption. RSA can do both, but I didn't use it because it's an order of magnitude bigger and would have been impractical.