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Questions tagged [kalyna]

Cipher specified in https://eprint.iacr.org/2015/650.pdf

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Kalyna AddRoundKey

I don't understand how the AddRoundKey function works, because the following example is from the cipher authors. I`m trying to add 76 and 7d, and my result is f3. Could someone explain this? 8F 20 3E ...
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73 views

Can you point me to an MDS table reference for the Kalyna cipher?

I'm working with cipher Kalyna. Kalyna — like AES — has MDS tables in its MixColumns step. But Kalyna's documentation doesn't list these MDS tables. Could you give me a hint where to find proper ...
7
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1answer
2k views

Is the cipher “Kalyna” with a 512-bit key length more secure AES with a 256-bit key?

Recently I have found out that Ukraine has its own symmetric encryption algorithm "Kalyna". Developers of this algorithm said that their algorithm is more secure than AES because of longer key length ...
6
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2answers
355 views

Reverse Fixed Points in Kalyna S-Boxes and Reverse Engineering the S-Boxes

I was examining the S-Boxes of the Kalyna Cipher and found that 3 of the 4 S-boxes have reverse fixed points i.e S[x] = (255 - x). Is this an exploitable weakness? I was not able to find any open ...
7
votes
2answers
438 views

Is standardizing a modified AES a good idea?

"Recently" the Ukraine standardized a new block cipher Kalyna, which according to the abstract of"A New Encryption Standard of Ukraine: The Kalyna Block Cipher" by Oliynykov et al. (warning: the paper ...