![]() ![]() ![]() Use decent password management software like KeePass to generate and remember a long, random, unique encryption password for each archive you make, as well as remembering its online URL if you then store it in a sharing service like Dropbox.ħZip and KeePass have both been around for a good long while and are likely to remain supported indefinitely on most platforms. Best practice is to right-click an encrypted archive and extract it to a specific location rather than just opening it with a double-click, because the latter is implemented using extraction to a temp folder that it's often hard to find and easy to forget to clean up afterwards. 7Zip password protection is implemented using AES256 encryption, so it's safe enough for most purposes provided you're careful about making sure that decrypted versions don't accidentally get left lying around after archives get created and/or opened. You can encrypt any file or collection of files by wrapping them in a password protected 7Zip archive. Presumably Dropbox has a few more layers of security around their key/account servers than around their encrypted bulk storage, but you're completely correct not to trust any encryption that isn't done on equipment in your sole control with keys known only to you. For example, in order for an attacker to decrypt your medical records after stealing them from a Dropbox server, they must also either have stolen your account information as well, or must already have had prior access to your medical records to generate the right hash code to decrypt them with, making the theft from Dropbox somewhat pointless. ![]() This means that the only way to decrypt a file stored on Dropbox is to have had prior access to the decrypted version at some point. Dropbox does actually encrypt your files when at rest, with keys derived from a hash function over the contents of the file itself this technique allows multiple copies of identical content to be stored as a single file on their servers and just linked from multiple accounts. ![]()
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