EZ
Welcome to Securinets, this one is an easy one.
Please make sure you hash the WORD with sha1 (lowercase hash letter)
The final flag is : Securinets{the_hash_of_the_word}
与えられたzipを解凍すると↓の画像が出てくる。
pic.png
strings, steghide, foremostとかしたけど気になることは特にない。 stegsolveとかカチカチしてたらRGB LSB0ビットを抽出したときに文字列が出てきた。
--START-- "The fact is that upon his entrance I had instantly recognized the extreme personal danger in which I lay. The only conceivable escape for him lay in silencing my tongue. In an instant I had slipped the revolver from the drawer into my pocket and was covering him through the cloth. At his remark I drew the weapon out and laid it cocked upon the table. He still smiled and blinked, but there was something about his eyes which made me feel very glad that I had it there, "You evidently don't know me,' said he. "'On the contrary,' I answered, 'I think it is fairly evident that I do. Pray take a chair. I can spare you five minutes if you have anything to say.' "'All that I have to say has already crossed your mind,' said he. "'Then possibly my answer has crossed yours,' I replied. "'You stand fast?' "'Absolutely.' "He clapped his hand into his pocket, and I raised the pistol from the table. But he merely drew out a <DETELED_WORD> in which he had scribbled some dates. "You crossed my path on the fourth of January,' said he. 'On the twenty-third you incommoded me; by the middle of February I was seriously inconvenienced by you; at the end of March I was absolutely hampered in my plans; and now, at the close of April, I find myself placed in such a position through your continual persecution that I am in positive danger of losing my liberty. The situation is becoming an impossible one.' "'Have you any suggestion to make?' I asked. "'You must drop it, Mr. Holmes,' said he, swaying his face about. 'You really must, you know.'" --END--
英語が分からないのでWhat's thisって感じ。Google翻訳に頼る癖がいけない。 とりあえず縦読みとか会話の先頭だけとかをRotとかしてみたけど特に何もない。 大変困っていたところ<DETELED_WORD>が目に入った。
"He clapped his hand into his pocket, and I raised the pistol from the table. ぐぐった
"He clapped his hand into his pocket, and I raised the pistol from the table. But he merely drew out a memorandum-book in which he had scribbled some dates.
memorandum-bookがわかったのでsha1でハッシュする。
FLAG : Securinets{b47f0d2a8866a75696f94a515d0cdf54c7ea3174}