As glossarian in residence I cannot but expand the above app-sec acronyms:

* CBC - Cipher block chaining: https://en.wikipedia.org/wiki/Cipher_block_chaining#Cipher-b...

* CFB - Cipher feedback: https://en.wikipedia.org/wiki/Block_cipher_modes_of_operatio...

As evinced by the structural similarity of the diagrams in the pages above, the two are very similar; hence tptacek's characterisation of their combination in encfs as "weird", I presume.

* XTS - "XEX-based tweaked-codebook mode with ciphertext stealing": https://en.wikipedia.org/wiki/XEX-TCB-CTS#XEX-based_tweaked-...

I have to more or less hope this is the encryption mode referenced above. NIST recommends an AES cipher to employ with it.

Resolving all acronyms here seems futile (albeit entertaining), thus I will simply rest.

(This is my last unsolicited reply in this thread, I promise.)