Platinum.7z: _verified_

October 26, 2023 Category: Digital Archiving / OpSec

The .7z Enigma: Why I Encrypted My Legacy in Platinum platinum.7z

Here is why I moved my digital legacy to the Platinum standard, and why you should consider what "Platinum" means for your own data. Using standard Zip for my life’s work resulted in a 4.2GB file. Using 7-Zip’s LZMA2 algorithm on the "Ultra" setting turned that same data into 3.1GB. October 26, 2023 Category: Digital Archiving / OpSec The

But Platinum isn't just about size. It is about the dictionary size. I set the dictionary to 256MB. It took three hours to compress, but the resulting entropy is a brick wall. You cannot peek inside a Platinum archive; you have to commit to extracting the whole thing. AES-256 is the law of the land. But platinum.7z uses the specific implementation found in the 7z container. Unlike ZipCrypto (which is broken within seconds), breaking the AES-256 on a properly generated 7z file requires the heat death of the universe. But Platinum isn't just about size

Go make your platinum.7z . Then hide it. Do you have a "Platinum" file? What do you keep in yours? Let me know in the comments below.