# All Questions

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### How can Käsper and Schwabe's Bitsliced AES Mixcolumns work

The only way I see it possible to do the matrix-multiplication in the MixColumns operation of AES is by shifting the bits in the multiplied number, and then reduce with the polynomial if needed. ...
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### DROWN - decrypting ServerVerify message is not enough?

I have read this article, but I can't understand why after decrypting ServerVerify, the client needs to send the export grade PMS again... When exploiting these flaws the attacker will send its ...
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### Book recommendation about MPC? [closed]

I have hard time finding introductory book talking about details of secure multiple party computation. Is there any recommendations? Thanks for the help. Hope this is not off topic.
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### In Fortuna, can I use ChaCha20 instead of a block cipher and Blake2b instead of iterated SHA256?

In the Fortuna CSPRNG, can I use ChaCha20 instead of a block cipher and Blake2b instead of double SHA256, and still retain security? My hypothesis is "yes" because: The block cipher's only use is ...
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### Encrypting using “Cryptography.HMACSHA1”, how to decrypt (VBA)

I have an encryption routine that works very well in VBA. But now I need to program the decryption routine, and I'm stuck. For encryption I'm using HMACSHA1 and transferring the encrypted byte to base ...