Hacker and Alien.

Summary

Yang Hai Chen mistakenly assumes the significance of the character "dense" in the password of "K Antivirus Software," which only its designer understands. Professor Song Ping, unaware of this character's meaning, realizes Yang Hai Chen lacks knowledge about the password's content. As she investigates, she finds "dense" written on a scrap of paper but can't confirm its relevance. Seeking assistance, she consults her friend's husband, a network expert, who discovers vulnerabilities in her optimization program that had been corrupted by a virus. After extensive modifications, he sets a password but doesn't recall using "dense." This leads them both to investigate the mystery further.

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