Top new questions this week:
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I've read in DigitalOcean article about SSH that in order for a server to authenticate a client:
The server sends the client this encrypted message.
If the client actually has the associated ...
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I've been learning about lattice cryptography and have noticed that most resources such as this survey by Chris Peikart, the Winter School on Lattice Cryptography etc don't include material on LPN, ...
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I am studying RSA-KEM but I can not see why it should be as secure as padding RSA messages (e.g with RSA-OAEP) when exchanging a key between two parties (say A and B).
It is easy to see that ...
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Background
Hello everyone,
I am a novice in the field of cryptography and cyber-security, and while studying asymmetric-key encryption, I learned about the potential of a man-in-the-middle attack.
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In "Universal Accumulators with Efficient Nonmembership Proofs" by
Jiangtao Li1, Ninghui Li2, and Rui Xue3 section "How to compute witness with the auxiliary information" the authors write:
"The ...
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I am trying to find the sub keys of a FEAL-4 cipher. I am able to get a number of possibilities for $K_0$ after using Michael Stamps formula using a as a constant and going through $2^{32}$ keys. The ...
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So everyone seems to agree that recurring round keys in a Feistel network (eg. using the same key for every round) are a massive security leak. When researching this, the only thing I found is the ...
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Greatest hits from previous weeks:
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I read that
A typical stream cipher encrypts plaintext one byte at a time, although a stream cipher may be designed to operate on one bit at a time or on units larger than a byte at a time.
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I would like to audit how an implementation of an encryption algorithm is really performed with the following given data of the problem:
the encryption mechanism is reversible (this isn’t a ...
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The diagram below illustrates the process of digitally signing a message with RSA:
As diagram shows, the message is first hashed, and the signature is then computed on the hash, rather than on the ...
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First off, I know hashes are 1 way. There are an infinite number of inputs that can result in the same hash output. Why can't we take a hash and convert it to an equivalent string that can be hashed ...
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What is the difference in the purpose of DH and RSA? Aren't they both public-key encryption?
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I recently noticed a .NET software using PBKDF to derive an encryption key from a password string. This password string was dynamically generated using System.Random. Now, I know that System.Random is ...
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I have been studying Elliptic Curve Cryptography as part of a course based on the book Cryptography and Network Security. The text for provides an excellent theoretical definition of the algorithm but ...
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Can you answer these questions?
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For a PKE scheme $(Gen, Enc, Dec)$, the most 'obvious' idea is to commit to an encryption of a bit and in the reveal phase maybe send $r_g$, $r_e$ where $r_g$ is the randomness of $Gen$ and $r_e$ is ...
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I'm analyzing a binary which for its AES encryption, its only calling aeskeygenassist once and for the last argument (imm8, the round) its sending static value of 0x46.
Does this mean its using only ...
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Can anyone explain to me what the difference is between a hash chain, transaction chain and a blockchain?
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