How does data compression work from a technical standpoint? Well, the actual algorithms that decide what data gets thrown out in lossy methods and how to best store redundant data in lossless compression are extremely complicated.
This overview of data compression is meant to serve as a high-level overview of the basics and provide context for how to apply these practices in real-world situations. In his role at NetMotion Software, Adam is responsible for reporting on mobility industry news and managing social media communities. Outside the office, he enjoys snowboarding, surfing and exploring the Pacific Northwest.
Connect with him on Twitter adamsharkness. Adam Harkness. Skip to primary navigation Skip to content. Connectivity By: Adam Harkness August 20, Meet the secure virtual private network that's purpose-built for mobile workers. The administrator of your personal data will be Threatpost, Inc.
Detailed information on the processing of personal data can be found in the privacy policy. In addition, you will find them in the message confirming the subscription to the newsletter. The newly discovered steganography method could be exploited by threat actors to obscure nefarious activity inside photos hosted on the social-media platform. A security researcher has discovered a novel steganography technique for hiding data inside a Portable Network Graphics.
PNG image file posted on Twitter, a tactic that could be exploited by threat actors to hide malicious activity. If his method is successful, it can give attackers another way to hide in hosted images on a widely used social media platform. There are some requirements for both the images used to obscure files and the files being hidden inside them for his method to work, Buchanan explained.
Resolution on images can be up to x , although Twitter will serve a downscaled version by default for images greater than x depending on certain factors, Buchanan wrote. Moreover, if the embedded file is a ZIP, then the offsets are automatically adjusted so that the overall file is still a valid ZIP, he said.
The original 6KB image Buchanan tweeted with the declaration of his finding—once opened and its file format changed to ZIP—contained an entire ZIP archive with his source code that anyone can use to pack miscellaneous contents into a PNG image, according to the report.
Buchanan also posted another photo to Twitter that he asked people to download, renamed to. A Zip file has a feature called "header" which is responsible for keeping information such as the file name, the date you created it, file size, and so on. The information in a header is essential in opening or accessing the contents contained within the file. This only goes to say that if the header is corrupt, there will be the challenge of the Zip file not opening.
A Zip file can be seriously damaged if its extension is changed to another format that is not supported on Windows. A Zip file that is severely damaged may not open when you are trying to extract its data. If your Zip file is stored in an external storage device and the device gets damaged from exposure to such hazards as magnetic fields, dangerously high temperature, or even mechanical shock, it can affect the contents of the drive, including the Zip file in it. This can lead to corruption and your inability to open the Zip, even if the drive eventually gets repaired.
Also, another reason could be if you forget the password to your encrypted archive file. However, this is only applicable if you originally assigned a password to your Zip file. The incorrect file extension is another issue that may trigger the 0xcbf error. This situation mostly occurs when you have renamed a file without properly converting it through a dedicated video conversion software or tool.
It can be overwhelming trying to choose which format to use, especially if you are not sure the file can be opened on your Windows. Therefore, this part will show you the three major Zip files that can be opened on Windows as discussed below:. Zip: This archive format is ideal for large files to be transferred because you can compress more than one file into it, thereby reducing the time and resource wastage that comes with transferring large files. It also helps in keeping similar files in a single location.
Zip is regarded as the most common compression format used on Windows for the sharing and emailing of files. Your Windows can internally handle Zip files without you having to seek the help of external software or an extra tool. ZipX: This type of Zip file is more advanced than the normal Zip file format. ZipX files contain several files that are compressed into the extended version of Zip format and in smaller sizes than the previous Zip formats.
This is where the advanced function comes into play. It enables you to transfer Zip files easily while saving storage space for your system. It is interesting to note that the 7Z file format was introduced by Windows itself so you are assured it can be opened on your Windows. If your Zip files are not opening, you can try using one or more of the many available programs online that are specially designed for zipping and Unzip archive files. Below is several recommended software for you:. WinRar: WinRar is a powerful tool that tops the chart of unzippers.
It chooses the best compression method to use for your file archiving; creates smaller compressed files which makes it faster than other tools.
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