We live in a very opressed world, where we are constantly being spied upon. Nobody is safe from spies and hackers, we all have crosshairs painted on our backs. Our digital data is very vulnerable, if left as it is, we must encrypt them to know for sure that they are private.
Because Encryption secures personal property. If your cryptocurrency wallet is not encrypted, then the coins are not yours, because anyone can steal them. The same goes for your financial documents, identity documents,or other personal and financial info, or even your personal photos that you took with your loved ones and don't want to share with the world!
There are many encryption softwares that offer bulletproof encryption. Don't use those, they are either honey traps (malicious software setup by hackers to steal your data), or scams (promising some crappy software that they know doesn't deliver).
First of all, ditch Windows. If you want to be serious about encryption, ditch it. Windows can get access to your keys, so it doesn't matter what you do on it, it won't be safe.
So now that you use Linux, you have multiple options for multiple purposes:
If you have a working PC where you do your work, you should encrypt all your hard disk, and for this we use LUKS, the built in Linux encryption system. When you setup your Linux, you are given an option to encrypt the entire drive. Do it. This way your data will be safe, especially physically, if someone were to get access to your PC, they cannot read the hard - disk, without knowing the keys.
https://en.wikipedia.org/wiki/Linux_Unified_Key_Setup
For file encryption, I recommend Veracrypt, it's a successor to Truecrypt, which was unbreakable at that time, although it had other vulnerabilities. To cryber-security experts knowledge Veracrypt doesn't have any vulnerabilities, it has been audited and it's open-source, so you can verify the code.
It offers file encryption with AES-XTS cipher, Serpent, Twofish, and even a combination of them, in a nested format, one layer inside the other, providing very good security. It is pretty much unbreakable by brute force.
You can choose the file container's size, and add extra entropy with mouse movement, and such. It is very well built, with key stretching and many other hardening features that make it pretty much my favorite software.
It also has Plausible Deniability feature, as you know the 5$ joke:
(Image Source: https://xkcd.com/538)
So if somebody wants to extort you for your data, you can always plausibly deny that you have them, or even mislead the attacker. As Veracrypt offers invisible containers:
So you will have 2 passwords, 1 guarding the misleading data, and 1 guarding the actual data. Very genius!
Depending on how important information you hold (1 million Bitcoins) you can never be too careful, as we see more and more hackers and extorters coming after people, including, but not limited to the government.
This is your Encryption 101, if you have any questions, ask them in the comments! Just remember don't forget your password and don't have malware on your PC, otherwise encryption is useless.
There is no 100% secure encryption, the title was a little bit of a clickbait (sorry), but it all depends on how securely you use it, and how careful you are when browsing the web. You get a trojan, and all your encryption becomes worthless.
