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The linked mail talks about XTS constructions, so the thread is about block encryption commonly used in disk encryption schemes. They also mention that they'd h
by the8472 8y ago
The linked mail talks about XTS constructions, so the thread is about block encryption commonly used in disk encryption schemes. They also mention that they'd have to handroll such a scheme with ChaCha. I assume that Speck offers a native wide block mode which would make a better candidate for software disk encryption if it weren't for the backdoor concerns.
- arghwhat 8y agoThat is fair, but that is by no means an argument for Speck, but instead just an argument for a block mode cipher. What they would need to do would be to find a different sensible block mode cipher, rolling a cipher-text stealing operation mode like XTS for a stream cipher (which is not that complicated, although one should do their homework first), or using a construct to convert a stream cipher to a block mode cipher so it can use XTS directly (which is possible, but care must be taken). #2 would probably be best. I am not sure if it a trend, but I seem to mostly see new stream ciphers popping up, so this solution is likely more sensible.
- ciphergoth 8y agoWe have a stream cipher based proposal, but it's a much bigger change and needs much more review, so it can't be landed for P. A drop-in replacement for AES is a much simpler change to make.