# Questions tagged [homomorphic-encryption]

Cryptosystems which support computation on encrypted data. They might be partially homomorphic (support for one operation such as + or *) or they might be fully homomorphic (any sequence of + and *).

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### How to break fully homomorphic encryption over integer algorithm with known cipher of same integer?

If I do encryption and decryption like this: Encryption: $\text{E}(m) = (r \times p_1+m) \bmod N$ Decryption: $\text{D}(\text{E}(m)) = ((r \times p_1 + m) \bmod N) \bmod p_1 = m$ where, $r$ = ...
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### SEAL - binary encoded ciphertext

In SEAL, am I able to convert a ciphertext that is encoded with polynomial to a ciphertext that is encoded as binary?
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### Cryptographic Counter

Good morning, I state that I am not an expert in cryptography. I'm studying the feasibility of a project which looks like requires a kind of cryptographic counter that behave similarly to the one in ...
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### Legendre conditions on the factors of the fundamental negative discriminant to minimize the 2-Sylow subgroup of the class group

If we know the prime factorisation of the fundamental negative discriminant $\Delta_K$, say $\Delta_K=p_1\cdot p_2 \cdots p_n$, then we are guaranteed that at least $2^{n-1}\mid h_K$, the class number ...
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### Turn a homomorphic encryption scheme into one that doesn't have the homomorphic property

Homomorphic encryption is a form of encryption that allows computation on cipher-texts, generating an encrypted result which, when decrypted, matches the result of the operations as if they had been ...
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### Are software solutions such as FHE, PHE, Garbled Circuits used in practice?

Is Fully Homomorphic Encryption or Partially Homomorphic Encryption or Garbled Circuits used in practice? Or is an alternative used instead (I don't mean encryption just for storage here)?
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### Example of an attack on a message exchange which uses the homomorphic property

Can someone give me an example of an attack on a message exchange using this encryption scheme, that uses the homomorphic property? In my opinion, Existential forgery under directed message attack ...
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### Security of certain homomorphic encryption scheme

Is the following homomorphic encryption scheme: Ahmed El-Yahyaoui and Mohamed Dafir Ech-Chrif El Kettani, A Verifiable Fully Homomorphic Encryption Scheme for Cloud Computing Security (April 2018, at ...
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I am new to cryptography esp, homomorphic encryption. I would like to know if the following is possible using something similiar to additive homomorphic secret sharing. Please apologize me if its too ...
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### Homomorphic encryption - addition for more than two parties

I have just found out about the homomorphic encryption and I was wondering how is it possible to perform an addition for more than two parties? More concretely, I want to have several parties $P_i$, ...
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### Floating Point Homomorphic Encryption Schemes

Are there any homomorphic schemes that can homomorphically compute addition and/or multiplication of encrypted floating Point data?
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### Partially homomorphic addition - not all parties present

I often see homomorphic encryption as a solution to a problem where a server wants to know the sum of $n$ users' numbers but can not know each individual users' number plaintexts. My question is: if ...