First, security is not black or white: there is always risk ranging from near (but not completely) zero to near 100%. How about when the car is operated by a 15-year old on a busy road at night while texting on his cell phone? Probably not. Is driving a new car with air bags and a good crash test rating safe? Probably. Not a good salesman, he replied, “Why bother? A burglar would just break the window.”
#LINUX FILE SHREDDER UPGRADE#
Are these features secure?Ĭoncerned about the security of my house, once I asked a locksmith whether I should upgrade the standard lock on my front door. Unlike other cleaner applications, BleachBit shreds Internet history in Firefox without deleting the whole Firefox Places database. To hide the original name, BleachBit renames the file to a long name and then a short name.
At the end of a file, it may write additional data to wipe the slack space. When overwriting is enabled, BleachBit wipes the data with a single pass of blank data. On the other hand, shredding takes time proportional to the size of the file.īecause additional passes add no value and only offer a false sense of security (see below), BleachBit does not implement multiple passes. Shredding is much slower than deleting because deleting changes only the file system metadata, which is small and a consistent size for all files: the metadata is the name of the file, its location on the disk, a time stamp, owner, etc.
#LINUX FILE SHREDDER FREE#
Wipe free disk space to hide the contents of files previously deleted by any software.Overwrite specific files found anywhere on the hard drive (such as a confidential spreadsheet on your desktop).Overwrite specific files found by its cleaners to hide the contents of these files (such as Firefox Internet cache).
What features does BleachBit have to securely wipe files?
False: The United States Department of Defense approves of overwriting of a whole hard drive as a data sanitation method.False: There are methods approved by the DOD (5220.22-M), NSA, and Gutmann to shred files.False: Peter Gutmann’s paper applies to modern hard drives.False: Peter Gutmann thinks data should be overwritten with 35 passes to prevent recovery.False: Overwriting data with multiple passes makes it harder to recover than overwriting it with a single pass.False: Data on a hard drive overwritten by one pass can be recovered by powerful government agencies.Before discussing what is true, let’s preview what is not: Most of the confusion regarding the topic of data remanence (data left behind after it is deleted) is because of myths and urban legends. Regardless of the tools you use, please read this guide carefully and completely.
This guide will explain how 1 pass is enough, but 35 passes are not enough. Any product or method suggesting a convenient, comprehensive solution to security is deceptive: convenience and security oppose each other. Some applications even advertise “advanced” erasure methods referencing important names in security such as Gutmann, the United States Department of Defense, and the NSA, but these references often mislead people to waste time on snake oil technological remedies while ignoring important basics.
#LINUX FILE SHREDDER SOFTWARE#
Normally when software deletes a file, only the “metadata” is erased: that means the complete contents often can easily be recovered, so BleachBit (and similar applications) offer secure erase features (also called secure wipe, secure overwriting, or file shredding) to permanently remove data.
0 kommentar(er)
