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March 31, 2005

パスワード

映画や本のネタが無いのでパソコンネタです。

Windowsには色々なパスワードが存在します。
例えばWindows98なら*.pwl というファイルにログインパスワードが暗号化され記録されています。
パスワードを忘れた時などは、このファイルを削除し、あらためてパスワードを設定することが一つの解決策であったりしますが、悪意のある人にこのファイルが渡るとどうなるでしょう?。
そうなんです、パスワードを解読されてしまうんですね~。

という事で実験開始。
本当に知らないパソコンで使用されていたHDDの *.pwl ファイルを、pwlクラックツールを使って解読開始!。
Dictionary attackが始まり、ついで Brute-Force attack。
で、数時間後に6桁のパスワードが無事解読されました。(*^o^*)

当然、そのパスワードを使い、はれて正規ユーザとしてログイン成功。
う~ん。怖いですねぇ~。
前にも書きましたが、HDDをフォーマットしたくらいなら簡単に *.pwl ファイルを見つける事が出来ますので、取扱には注意しましょうね~というお話。

なるべくランダム性の高い記号も含んだ文字列のパスワードにした方が解読が難しくなりますね。簡単なアルファベットと数字の組み合わせで使う場合はシチュエーションを選びましょう。

余談ですが、この手のツールはVirusとして認識され、アンチウィルスソフトがインストールされているとDLと同時に検疫されてしまいます。アンチウィルスソフトを一時的に停止させるのはシステム設定...とか使うなり、レジストリを書き換えればOKですね。
ではこの辺で。 (^0^)/~~see you again!

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