Hello,
Yes any information that you pass over the internet like passwords, credit card numbers and all that can be snifed and recorder. there are certain steps that you need to take to avoid such mishaps
1) regularly scan your pc for virus and spywares.
2) Do not click on links in emails from unknown people.
3)Make sure the site that you are entering information is using https protocol which is kinda of secure.
4) if you keep a record of information of password or number on your pc , password protect it
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