hello. I would like to know if for secure erasing purposes, Ccleaner (1 pass overwritting) could be considered "profesionally" safe, compared with other erasing available software?  

I am speaking of recent versions like v3.23.1823.  

Do you mean Piriform CCleaner? It's about as "professional" as any housewife's computer tool. No offence to housewives.
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Computer, Mobile, RAM and Cloud Forensics In a Single Tool
belkasoft.com 

- williamsonn

hello. I would like to know if for secure erasing purposes, Ccleaner (1 pass overwritting) could be considered "profesionally" safe, compared with other erasing available software?

I'd think that this would be easy to test...  

- keydet89

I'd think that this would be easy to test...

Sure, just run CCleaner and then see what you can get back with Recuva
www.forensicfocus.com/...ic/t=10194
www.forensicfocus.com/...ic/t=9821/

jaclaz
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- In theory there is no difference between theory and practice, but in practice there is. - 

To be fair, CCleaner is a very thorough and powerful end-user tool. Dave Cowen used it as an example in his anti-anti-forensics talk -- related to his $Logfile research. It's not just a joke. And, as Harlan points out, it's easy enough to test, which is what Dave did.

A couple of weeks ago, I
suggested that williamsonn should look into it.

Did you?
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Aptegra Consulting, LLC
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- TuckerHST

To be fair, CCleaner is a very thorough and powerful end-user tool.

Sure it is , still it is not aimed at secure erasing a device, it is aimed to erase a filesystem or, more correctly parts of the filesystem (files or free space or even unused/old $MFT entries), just like Recuva is aimed to recover deleted files on a filesystem:
www.piriform.com/docs/...r-settings

In my perverted mind, if all I can find, with *whatever* methods, on *any* sector of the device is 00's then that is "secure erase", and most if not all "secure erase" programs are aimed to the device and not at the filesystem, so I wouldn't know with what to compare, possibly sdelete:
technet.microsoft.com/...97443.aspx

jaclaz
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- In theory there is no difference between theory and practice, but in practice there is. -