Top new questions this week:
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A custom file format has a header encrypted with a 2048-bit RSA public key. I need to decrypt it using a 2048-bit RSA private key. The header has 48 bytes, and according to the scheme I got for the ...
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Suppose someone has a black box, which is running some program. This box has some internal states, and we can observe the outputs it produces. Now someone comes along and claims the release the source ...
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Let's say a device has 2 private keys and service has the 2 corresponding public keys.
Is there an efficient way to encrypt a symmetric key from the service side utilizing the 2 public keys, such that ...
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In the official documentation of the X3DH Algorithm (link) is made an analysis about the forward secrecy. Forward secrecy would be an uselful property if we would repeat the protocol multiple times. ...
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I am currently studying the proof of the Dilithium signature in the quantum random oracle model (QROM). I am curious to hear if anyone have any thoughts on the importance of having proofs in the QROM ...
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I have found similar question for PIV (and not PGP)
I assume PIV and OpenPGP would work in similar ways. I also assumes that the GPG private key never leaves the Yubikey.
If these assumptions are ...
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I understand that FIDO2/WebAuthn generates a separate key-pair for each web-site (domain), and only allows a specific key-pair to be used for authentication on the same web-site (domain) who ...
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Greatest hits from previous weeks:
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I have three questions:
Would you use HMAC-SHA1 or HMAC-SHA256 for message authentication?
How much HMAC-SHA256 is slower than HMAC-SHA1?
Are the security improvements of SHA256 (over SHA1) enough to ...
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Can I remove new lines from the RSA public key file to get a one line string? So the question is if the key looks like this
AAA
BBB
CCC
or
...
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I am a programmer, so when I hear XOR, I think about the bitwise operator (e.g. 0110 ^ 1110 = 1000).
The mention of "XOR" comes ...
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I got an answer in the related question about Mixcolumn for encryption, but how about decryption?
what will I do?
Because it said that I will used this:
During decryption the Mix Column the ...
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WhatsApp says even the photos shared on its platform are end-to-end encrypted. When WhatsApp says encrypted I assume the data is encrypted in my device and then sent across to the recipient.
When we ...
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I read about ChaCha20 being used in TLS by Google, SSH, and towards standardization in general.
What's the appeal of using something other than AES, what with AES receiving dedicated CPU instructions ...
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I was wondering about the difference between these two terms...
What is the difference between a digest and a hash function?
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Can you answer these questions?
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Let $E$ be an elliptic curve over a finite field $\mathbb{F}_q$. For simplicity, let the group $E(\mathbb{F}_q)$ be of prime order.
Assume that I know how to construct an efficiently computable ...
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In pairing based cryptography (PBC) we restrict the pairing domains to be subgroups of the $r$-torsion group $E[r]$. This arises two questions to me:
Why do we restrict them to subgroups of $E[r]$? ...
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I am trying to attack an unknown cipher. I can do a chosen ciphertext attack on a file that is encrypted with this cipher. I changed 8 bytes of the encrypted input file at the offset 0x000308c0, the ...
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