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Any password or key is more likely to get compromised the more it is used. That's why Steem uses a hierarchical key system to keep you safe. You are issued with Steem and TRON keys which have different permissions. For example, the Posting Key (which is intended to be used frequently) has a limited set of permissions for social actions that require less security. You'll need to be more careful with your Active Key since it has permissions to perform wallet related actions.