Top new questions this week:
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The titles says most of what we're confused with. Here's some details:
On an embedded device, we have a microcontroller and external flash memory. This memory can be easily read and written to in ...
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What does that mean, that A5/1 is clocked? What happens if the clocking bit agrees with the majority bit?
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NIST LWC finalists announced. My question is that how finalists are faster or slower than current golden lightweight AEAD standard -- ChaCha20-Poly1305.
Some benchmark among chacha20-poly1305 vs LWC ...
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There's a lot in the news about the energy cost of Bitcoin recently. Recently Elon Musk talked about "currencies using <1% the energy per transaction of BTC".
This page provides some ...
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Assuming you trust a client's public signature keys, a simple authentication protocol would be to send a long random string challenge, and get the client to sign it
Since most of authentication still ...
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I am reading this paper "Farfalle: parallel permutation-based cryptography", and there are some terms that I do not understand.
Page 4 says
ratio efficiency vs. safety margin.
What does ...
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Suppose I had a peer to peer system, there are a few writers with the same signing key, and all readers have the verification key.
A naive system is that each document $d_1..d_n$ gets signed $s_i=sign(...
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Greatest hits from previous weeks:
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I've been thinking about this for a few days, a SHA-256 algorithm outputs 64 characters which can either be a lowercase letter or a number from 0-9. Which should mean that there are 64^36 distinct SHA-...
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I'm trying to understand how the AES S-Boxes are calculated. I understand how the multiplicative inverse is calculated over $GF(2^8)$, but I'm confused by the description of the affine transformation. ...
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I understand how the RSA algorithm works for encryption and decryption purposes but I don't get how signing is done.
Here's what I (think) I know and is common practice:
If I have a message that I ...
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I can't understand what CFB really is. It said in Wikipedia that CFB is same as CBC, but I find that CFB is more difficult than CBC.
Can someone explain to me how CFB works. Such as how ...
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The only time a shift cipher considers to be perfectly secure is when used on a single letter of plaintext and no more. Having that in mind, we can say it is certainly not perfectly secure.
Caesar ...
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I'm signing very small messages using RSA, and the signature and public key are added to every message, which requires a lot of space compared to the actual content.
I'm considering switching to ...
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From Wikipedia:
Second pre-image resistance
Given an input $m_1$ it should be difficult to find another input $m_2$ such
that $m_1$ ≠ $m_2$ and $\operatorname{hash}(m_1) = \operatorname{hash}...
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Can you answer these questions?
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I'm new to encryption and this is my first time working with it. I'm currently working on a home project which consists of the equipment in my garage to be attached with a BLE device which sends ...
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I hope someone can help me understand an error I get when using Palisades. I want to only use the first 329 slots of a BGV ciphertext, and zero out the rest (which at some point contains some '...
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I've been trying to understand the ElGamal encryption/decryption technique. I plan to use it for sending a private message to the server. That is: Alice needs to send $Pm$ (private message encoded via ...
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