All Questions
Tagged with homomorphic-encryption threshold-cryptography
8 questions
2
votes
1
answer
341
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Shamir's secret sharing homomorphism for different degree polynomials
The $(t,n)$ Shamir’s polynomial based secret sharing scheme is $(+,+)$-homomorphic in which the addition of two polynomials secrets equals the Lagrange’s interpolation of the sum-of-shares for the ...
- 327
1
vote
0
answers
65
views
Threshold Encryption Scheme for Multiple Messages
In a threshold encryption scheme, a dealer generates $(PK,SK1,…,SKn)$ and distributes the secret keys to users indexed by $1,…,n$, and if a combiner obtains $t+1$ partially-decrypted ciphertexts, it ...
- 31
0
votes
0
answers
75
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Privacy preserving aggregation of encrypted data
I have the following problem: I have $t$ servers $S_1, S_2, S_3, \ldots, S_t$, each of them storing some $key : value$ list. They have to upload this data into a big dropbox server $D$, but in such a ...
- 235
3
votes
1
answer
893
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Threshold decryption in multi-key homomorphic encryption
I have a problem understanding the security of threshold decryption in multi-key homomorphic encryption (MKHE) with so called "noise flooding". In particular I think that it is not secure, so probably ...
- 133
0
votes
1
answer
131
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Is there any implementation of threshold BGN homomorphic encryption? [closed]
The BGN paper (Evaluating 2-DNF Formulas on Ciphertexts) used a threshold variant of BGN. I also want to use this cryptosystem, however, I cannot find any open-source implementation. Is there any such ...
- 41
5
votes
0
answers
78
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Threshold homomorphic
Quite a specific question, but are there any threshold signatures that are also homomorphic? Preferably ones that work in the discrete log setting and don't require any pairings.
2
votes
0
answers
189
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NTRU-based threshold encryption system?
I want to implement threshold homomorphic encryption for my project.
(encrypt a message using one public key, and decrypt a ciphertext using distributed secret keys)
I read a paper "Multiparty ...
- 509
0
votes
1
answer
486
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Secure Multiparty Sum in malicious model using threshold encryption
Suppose $n$ actors each hold a plaintext $p_i$. We wish to find $\sum p_i$, without leaking any information about individual $p_i$. Any actor (or any link in the network) could be controlled by an ...
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