Hi, jbaeng, and welcome to the Community,
Please file with Skype Customer Service, using this link, contact customer service to enquire why your account is suspended or blocked and what needs to be done to un-block your account. Skip past Step 2 and proceed directly to Step 3 as you know you need to contact Customer Service.
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-> Good reads: Devise good passwords and stop password attacks
and this one, too: http://www.rd.com/slideshows/internet-security-how-not-to-get-hacked/