Depends on how they are used and where they are used.
It is good to not use your master password or owner password at all, having them securely stored somewhere offline.
Use active key only when it is explicitly needed making sure that you are on a trusted site. For most users it means steemit and steemit only.
Your key would not be guessed during your lifetime unless quantum computing become a reality. So the only risk is in their usage. If you used public place (internet cafe or shared PC) then change your key. Being unsure is also quite good reason to change it but you have to make sure that you would not lose your new keys.
Nobody can help with password recovery if you lose it.
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Wow. Great info here. Thank you. Resteemed.
@gtg I put a question in Steemchat for you under @gandalf.
All is good. I updated you in chat. Thanks a bunch for this post.
Sorry for a lack of quick reply, it usually take me some time before I'm able to respond.
🤣 that's no problem! I changed my keys. Curious, am I correct in saying that in Bittrex, their memo field is for a memo now, not for a private memo key? Yikes!
Yes, memo field is for tagging your transaction to help you memorize details on what it was made for, etc.
That's when you are sending your transaction from bittrex, poloniex, blocktrades, etc.
You might notice that when you are sending to such exchanges they require you to put some special id there (never your key / secret). It's for the same reason, so they would know what they should do with such incoming transaction (match it to your account / request on that service)