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Cryptography

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  • $\begingroup$ Isn't the mode simply called TBC mode? I can easily find a paper on TBC and TAE (authenticated) modes. $\endgroup$ Commented Mar 23, 2020 at 22:56
  • $\begingroup$ @MaartenBodewes As far as I know, TBC stands for Tweakable Block Cipher. It is not a mode. Also papers that i have found uses a chaining mode (cipher of a block is used as a tweak for the next block). Finally, not only me asking for that mode's name. In the following link, you may find a correct answer stating clearly "not sure if it has a standard name" link $\endgroup$ Commented Mar 24, 2020 at 17:51
  • $\begingroup$ additional point to clarify my point of view. Threefish could be used in ECB mode or any other standard mode. Threefish still TBC, not a normal block cipher. $\endgroup$ Commented Mar 24, 2020 at 19:24
  • $\begingroup$ What do you need that CTR mode doesn't have? I hope you're using encrypt-then-mac authentication, not relying on limited malleability instead of authentication. $\endgroup$ Commented Mar 30, 2020 at 15:19
  • $\begingroup$ @Future Security Tweakable ciphers already deploy a tweak with the key, why not using it as a counter given that changing tweak is cheap in terms of CPU time $\endgroup$ Commented Mar 30, 2020 at 15:41