「剣道韓国起源説」は日本起源か？
http://togetter.com/li/487606

まだ調べてる最中です。 最初にこの風説が出はじめてから10年以上が経過しているため、当時のテキストがなかなか見あたりません。
※まとめの主旨にそぐわないコメントは削除することがあります。

4月15日時点における、オレの認識。これに尽きます。 「韓国が起源を主張しているとの主張の根拠は、そう信じていなければそうとは読めないものばかりだ。そう信じていなくてもそうとしか読めないものを出せばいいんだけど、そんなものがあるなら嫌韓者がとっくに出している。」
https://twitter.com/yunishio/status/323739838211829760

Recently, a new phenomenon has started to become apparent. One of the most significant contributors to the popularisation of budo in recent years is not only the Japanese, but also the Koreans. There has been a noticeable trend in the appearance of dojang around the world rather than dojo. Dojang is the Korean word for dojo, and where the Japanese left off, the Koreans are taking positive strides to pick up on the basis of most of the reasons I have outlined above.
Particularly in regions where Korean immigrants are numerous, yudo dojang are springing up in place of judo dojo, taekwondo provides an attractive alternative to karate for self-defence and has the added bonus of being a competitive Olympic sport, hapkido is Koreanised aikido, and more recently, kumdo is making inroads into the kendo world attracting mainly Korean immigrant children at this stage, but has the potential to change the face of kendo internationally, which will eventually have far reaching consequences even in Japan. This interesting phenomenon of the gradual ‘Koreanisation’ of budo overseas is perceived by the Koreans as the internationalisation of their own Korean martial arts heritage. The Koreans are aggressive in their dissemination, sometimes nationalistic, and often very commercial in their approach, providing attractive packages for their students and instructors alike, not to mention propositions of business partnerships with already existing dojo.

めんどくさいから全部は訳さないよ。
海外の韓国人居住区では柔道がユド、空手がテコンドー、合気道がハプキドー、剣道がクムドとして人気。
海外における武道のコリアナイズ化は韓国人の間で「韓国伝統武道の国際化」と認知されている。
韓国人はその普及にアグレッシヴでナショナリスティック、魅力的なパッケージや宣伝で生徒を集める。（ココ朝鮮忍者がやってることと同じだね！）既存の道場とは提携しない。

As colonies of Japan, the Taiwanese and Korean populace were also ‘encouraged’ to participate in these activities.(3) Koreans took to budo with unexpected enthusiasm, and even when the war ended and the Republic of Korea was established, they maintained a commitment to kendo that persists to this day, evident in the comparatively high level and large population of enthusiasts. (4) However, in many ways the old wounds of the occupation have still not healed, and in a nationwide revisionist stance, Koreans for the most part refuse to entertain the notion that the sport's origins lie in Japan, and instead call it "kumdo", insisting that it originated in Korea.(5)

日帝の恨みが続く韓国では剣道の起源が日本にある事を嫌って剣道と呼ばずにクムドと呼びその起源は韓国にあると主張する。

For example, to demonstrate this revisionist mentality, I have quoted the historical information placed on the official homepage of the Korea Kumdo Association.(6)
この歴史修正主義を見るために、例えばKKAの公式サイトから引用してみよう。

“Our nation boasts a long history and tradition of swordsmanship. In the Koguryo dynasty (?-688) mountain ascetics perfected their technique in sword and other weapons.
Similarly, the Paekche kingdom held specialist departments for the manufacture of swords, and there are records suggesting that sword masters were sent to Japan to teach swordsmanship.
However, kenjutsu developed greatly during the Silla dynasty (668–935).
Where a military academy was established in the capital city of Kyongju and was open to young men of aristocratic birth. Upon completion of their training, these young men were given the title hwarang, meaning Flower Knight.
This period was indeed the time when the military arts flourished. One of the most significant contributions to future swordsmen to come form this period was the book Bon Gook Gum Bup (••••••). This treatise forms the basis for two-handed sword techniques and modern kumdo...
The Koryo dynasty (935-1392 AD) inherited the Silla kenjutsu legacy and continued to develop it further. However, during the Chosun dynasty (1392-1910), military arts became disfavoured compared with civil arts, and fell into disarray. On the other hand, during this period, the recipients of our culture in Japan continued to develop the culture of the sword and it began to flourish over there.”

我が国は古い歴史とともに剣術が自慢だ。
高句麗では仙人が剣術をマスターした。
百済には刀工庁（？）があり史料によると日本に剣客を派遣していた。
しかし実際剣術が発達したのは新羅だ。
花郎のトレーニングに剣術が使われており、この頃が最も武術がさかんだった時代でもある。
後世の剣術家に影響を与えた本国剣法が生まれたのもこの時代だ。（なぜかbookになってるが）
この両手で刀を握るスタイルがクムドの元だ。
高麗は新羅の剣術を継承し発展させた。
ところが李朝時代になって武術は廃れた。
しかし一方で我々の文化を受け継いだ日本人が剣術を発展させていたのだ。