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by NavinF 970 days ago
Cascade encryption is pretty common. I remember using 3 ciphers with TrueCrypt in the 2000s. There are some theoretical issues that prevent you from using cipher1(cipher2(x)) though. See https://en.wikipedia.org/wiki/Multiple_encryption#Importance...

In practice post-quantum encryption is always combined with normal encryption so this sorta thing should become even more common in the future.