IT9睇Steins;Gate – 回應中出羊子《IT人睇命運石之門的悲哀》
羊子寫開，我又寫吓，Steins;Gate 中唔合邏輯嘅嘢。Spoiler alert，未睇過Steins;Gate 嘅人，睇完先好睇呢篇文。
利申：未玩Steins;Gate 0（諗住等睇咗動畫先），呢度提出嘅嘢唔排除喺0入面已經解答咗。
36 bytes + metadata D-mail
Steins;Gate 入面，因為某啲原因，每次send D-mail 只可以send 到共36 bytes 內文，加埋普通e-mail 嘅metadata。但其實一個正常嘅e-mail，每次嘅metadata 長度都可以唔同（例如：sender/receiver e-mail address 長度唔同），咁點解e-mail 內文會有固定長度限制？而唔係metadata 少1 byte 內文可以send 多1 byte？
其次，其實metadata 係可以好長：
Return-Path: <me@adrianiainlam.tk>
Delivered-To: me@adrianiainlam.tk
Received: from adrianiainlam.tk
by ibn5100 (Dovecot) with LMTP id vzEgG5eZqVliVAAAYrSuEQ
for <me@adrianiainlam.tk>; Sat, 02 Sep 2017 01:32:07 +0800
Received: from localhost (localhost [127.0.0.1])
by adrianiainlam.tk (Postfix) with ESMTP id 5BB546C01119
for <me@adrianiainlam.tk>; Sat, 2 Sep 2017 01:32:07 +0800 (HKT)
X-Virus-Scanned: Debian amavisd-new at adrianiainlam.tk
Authentication-Results: adrianiainlam.tk (amavisd-new);
dkim=pass (1024-bit key) header.d=adrianiainlam.tk
Received: from adrianiainlam.tk ([127.0.0.1])
by localhost (adrianiainlam.tk [127.0.0.1]) (amavisd-new, port 10024)
with ESMTP id Zhglg4P_20XC for <me@adrianiainlam.tk>;
Sat, 2 Sep 2017 01:32:06 +0800 (HKT)
Received: from [223.16.86.123] (unknown [223.16.86.123])
(using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits))
(No client certificate requested)
(Authenticated sender: me@adrianiainlam.tk)
by adrianiainlam.tk (Postfix) with ESMTPSA id 7256A6C005E6
for <me@adrianiainlam.tk>; Sat, 2 Sep 2017 01:32:06 +0800 (HKT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=adrianiainlam.tk;
s=mail; t=1504287126;
bh=mV+Uarv6OWKOrBAKu7qk7/n4hFIO3UyDJqQiJD7YWAA=;
h=To:From:Subject:Date:From;
b=mp5lviODOsd23ViXB5korIInYAJKkjlptmh5WjsJ43ri/cViqEnpz3Z9W9DBAuFg7
jLi/brhbRNgl0fGpSMTwcazzQUFDwSIqNkKFliCif7uusXKimQJkjNwP9oyJ4jakaV
IQNwt3iuTA9EjXhy1xSYO/CwuGAoRyM9mUPcj9eE=
To: me@adrianiainlam.tk
From: Adrian I Lam <me@adrianiainlam.tk>
Subject: Hey Mister
Message-ID: <7711326e-2bfb-664e-0902-41543ec6d00e@adrianiainlam.tk>
Date: Sat, 2 Sep 2017 01:32:05 +0800
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101
Thunderbird/52.2.1
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit
Content-Language: en-US
I am mad scientist.
It's so cool!
Sonuvabitch.
以上e-mail 為例，真正內文只有最尾 “I am mad scientist” 去到 “Sonuvabitch” 三行，其餘全部都係metadata。既然send 到咁多嘢，點解（以Super hacker Daru 對電腦嘅認識）會冇人諗過運用metadata 再send 多啲嘢？例如：自己host 個postfix+dovecot，send 出時用個DKIM-Signature 裝多啲嘢，收e-mail 時再decode 返。（當然只適用於send 到發明電話微波爐（偽）之後時間）。
用黑洞壓縮information
呢點應該唔使我多講，compress information 係要用algorithm（要計數），compress matter 要用力。黑洞係唔識計數嘅，只係有好大力啫。
Time leap 到發明Time leap machine 之前
呢點喺第一點亦略有帶過，即使假設佢哋有方法將兩日嘅記憶壓縮到36 bytes，請問佢哋解壓器喺邊？佢哋最多只可以喺發明Time leap machine 之後（或其間）先設計解壓器，亦即係話發明Time leap machine 之前，鳳凰院凶真部手機係冇可能將佢嘅記憶解壓，亦即係冇可能time leap 到發明Time leap machine 之前。
結論
睇Steins;Gate，唔係睇佢點樣發明部時光機，而係睇佢點樣用部時光機。