Recently I started wondering about multiple encryption and found pages upon pages of posts and debates about the security of cascades.
Now, don’t worry – I'm not looking for someone to discuss a homebrew cascade encryption scheme. What I do wonder about is the dangers of multiple layers of encryption.
I keep most of my sensitive files on a LUKS encrypted USB stick – and most of the files are encrypted themselves. There are AES encrypted password wallets, password protected LibreOffice documents (using AES if I have understood the documentation correctly) and lately I have been developing a growing folder of Camellia encrypted files (thanks to a colleague that discovered that GPG now included the cipher).
In short: does storing these encrypted files in an encrypted partition/folder create the same potential weaknesses as cascade encryption? If not, what about encrypting a
.tar of encrypted documents?
Pardon my ignorance, and thank you in advance.