Questions tagged [data-privacy]
Data privacy refers to (cryptographic) methods to prevent the disclosure of sensitive (identifying) information of persons.
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questions
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Differential privacy RAPPOR article proof doubts
Recently I've been trying to understand the RAPPOR proof:
\begin{eqnarray*}
P(B' = b' | B = b^*) & = & \left(\frac{1}{2}f\right)^{b'_1}\left(1 - \frac{1}{2}f\right)^{1 - b'_1} \times \ldots \\...
1
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1answer
41 views
Why does ε-differential privacy protect the subset of 1/ε edges in terms of graphs?
In the book The Algorithmic Foundations of Differential Privacy by Cynthia Dwork, Aaron Roth on page 24, databases that take the form of graphs are discussed.
We could on the other hand consider ...
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0answers
38 views
Two parties looking to share data anonymously
I've been struggling to find good info on how to do the following:
A(lice) and B(ob) each have a table of data (a and b ...
0
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1answer
86 views
Zero knowledge proof in smart parking managment systems
I read this paper on protecting user privacy in smart parking management system. It talks about using zero knowledge proofs to protect privacy but I am not certain how they do it. My assumption is ...
2
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1answer
44 views
Sensitivity of probability measure in differential privacy
I know that we need some sort of sensitivity(global, local) to calculate noise that needs to be added for differential privacy. The noise is the maximum difference between two neighboring datasets. ...
2
votes
1answer
126 views
what does differential privacy (in machine learning) promise or guarantee?
I am recently reading some papers about privacy-preserving machine learning.
Some works incorporate the idea of differential privacy to protect the privacy of the training dataset when the model is ...
1
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1answer
47 views
Facebook app-scoped identifiers and similar - implementing stateless ID obfuscation
After certain privacy concerns Facebook rolled out a bunch of changes to their APIs, one being "scoping" user identifiers per app. In effect, this means that Alice's canonical facebook user ID is ...
1
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0answers
34 views
Pros/cons of anonymity when messages are encrypted? [closed]
Let's say I'm making an end-to-end encrypted messaging app with the goal of putting "privacy first." The contents of messages are encrypted, but in the current model, it is still visible to the server ...
1
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2answers
157 views
Why the definition in $\epsilon$-differential privacy is multiplicative rather than additive？
According to its mathematical definition, a random algorithm $M: D\rightarrow R$ satisfies $\epsilon$-differential privacy if the adjacent datasets $x, y \in D$ where $D$ is a whole dataset and ...
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0answers
36 views
Audio Files and Digital Bearer Instruments
Is it possible to combine Audio Files and Public Key Cryptography creating a Digital Bearer Audio File that is in complete control of the owner who would then have the ability to grant access to ...
3
votes
1answer
86 views
Differential privacy on multiple queries – what is the behavior?
Differential privacy framework still continue to be obscure in the following case:
If I make a set of queries, I can join their output to restore the original data. For this issue we have composition ...
10
votes
1answer
341 views
Intuitive explanation of the $\varepsilon$ parameter in differential privacy
I think I have a decent intuitive understanding of what the $\delta$ parameter means in $(\varepsilon,\delta)$-differential privacy: I can explain it to a non-specialist in terms of "what are the ...
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0answers
68 views
Private Set Intersection using a subset of the larger set
Alice has a set $S_A$ with a low cardinality (say ~30k). Bob on the other hand has a set $S_B$ with a much higher cardinality than of Alice's (say ~100M).
We're trying to create a reduced ...
3
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1answer
711 views
Is there a hash tree scheme designed for complex data structures?
I have a JSON object with private data. It has the following (complex!) structure:
...
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0answers
33 views
Data masking / Data obfuscation for string int float and date , preserving order and exact matches
I've to mask data into some different value but to keep their property such as order an exact match (substring is yet impossible)
What's the state of the art in data masking? I've some data on which ...
2
votes
1answer
71 views
What are the advantages of mutual private set intersection methods over finding the intersection of hashed lists?
I can understand the usefulness of one-way private set intersection methods. Where Alice and Bob both have listed but only Alice learns the intersection of those lists while Bob learns nothing.
I ...
0
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1answer
186 views
Are there any practical use cases for performing homomorphic operations on encrypted Strings?
Does anybody know which practical use cases there are to operate on encrypted strings? Even niche problems that can be solved using homomorphic encryption on strings are interesting to me, but not ...
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1answer
102 views
How Zero Knowledge Proof enables Privacy By Design [closed]
How does Zero Knowledge Proof (ZKP) enable Privacy By Design?
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2answers
110 views
Cryptographic scheme where a single message cannot be decrypted but if combined with other it can be
i'm wondering if this type of cryptographic scheme does exists. I know about homomorphic encryption but if one has the private key, he can decrypt every single message.
I would like to know if there ...
1
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1answer
102 views
lookup encrypted text by clear text without decryption
I've implemented vouchers module in my web project where I use it to generate redeem get etc... vouchers.
since voucher codes are considered sensitive, I've considered to encrypt them using AES-GCM.
...
1
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0answers
110 views
Laplace mechanism from Exponential mechanism in Differential Privacy
In McSherry and Talwar's paper which introduces the exponential mechanism for differential privacy, they say that the Laplace mechanism can be captured by choosing the score function as $q(d,r) = - |f(...
1
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1answer
55 views
Filter party-1 strings against party-2 white/black list keeping the lists private
Suppose I have a server and a client. The client has a list of arbitrary strings and the server is supposed to filter this list using white and black lists kept on the server side. It would be nice ...
3
votes
1answer
144 views
Secure distance calculation
I am working on securing a feature in a csv file. My goal is to encrypt, anonymize, mask.... etc the content of the records of the feature while preserving the distance between the characters. as ...
2
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0answers
71 views
End-To-End encryption for VoIP teleconference applications and many-to-many lag-sensitive applications
There are various protocols that allow you to have privacy-enhanced chat.
Those can be either 2-party chat such as:
OTR
SIGNAL
or multiparty chat such as:
SIGNAL
(n+1)sec
mpOTR
GOTR (2013 spec and ...
1
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1answer
42 views
what can attackers do between two end hosts
I have one question that I couldn't come up with a nice solution.
So let's have this analogy, I have a box full of money and I want to deliver to this my friend. Here if we think of a potential ...
0
votes
0answers
23 views
Randomized response with more than 2 options
It is well-known that the binary randomized response mechanism is differentially private, with $\varepsilon=ln(3)$ if each person answers truthfully with probability $0.5$, and uniformly randomly ...
3
votes
1answer
231 views
Difference between ε-differential privacy and (ε, δ)-differential privacy
I don't understand the necessity of introducing the additive term δ in the differential privacy definition. Moreover, reading different papers and blogs they say that because of the δ term the ...
1
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3answers
188 views
Encryption for IOT devices with minimal overhead
I have several IOT devices that transmits nearly 200 bytes of data every 10 seconds. I want to make the data secured but i also want to keep the data size nearly same. Ofcourse for IOT devices ...
1
vote
1answer
51 views
Is it possible to derive the recipient's public key from libsodium's crypto_box?
Libsodium has "crypto_box_seal" which according to the documentation is used to "anonymously send messages to a recipient given its public key.", which hides the sender.
But Is it possible for Eve to ...
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votes
1answer
80 views
Is this construction a secure MAC?
Let $F:\{ 0,1 \}^n \times \{ 0,1 \}^ n \rightarrow Z^*_q $ is a PRF, and $H:\{ 0,1 \}^{2n} \rightarrow \{ 0,1\}^n$ is a secure hash function. Is the following construction $\Pi=(Gen,Mac,Vrfy)$ is a ...
2
votes
0answers
24 views
Avoiding multiple use of sIgned identities while not learning anything about them
There is an authority A with an associated public/private key pair (A.priv, A.pub).
A can issue new "identities" by signing data (numbers or bytestrings).
Each number associated with a signature by A ...
1
vote
1answer
34 views
Divide data into parts and restore from them
I'm not much familiar with cryptography, so please guide me in the right direction on the following question:
Let's say I have some data (array of bytes) $D$. I want to convert it into $N$ pieces (...
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0answers
145 views
Leak information (new setting)
This question is similar to Leak Information?, but with new settings.
Let $a,b,c,d,e,f$ be selected at random from $\mathbb Z^*_q$. Also, let $r_1,r_2,r_3,z_1,z_2,z_3,p_1,p_2,p_3$ be selected at ...
4
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0answers
132 views
computational indistinguishable/distinguishable?
Let $a,b,c,d$ be selected at random from $Z_q$. Consider the following two distributions $X_1$ and $Y_1$:
$X_1={(r_1\cdot a, r_2\cdot b, r_3\cdot c, (r_1+r_2-r_3)\cdot d)}$ where $r_1,r_2,r_3$ ...
1
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0answers
42 views
Seeking Fast Bloom Filter for Anonymous Address
I had an idea to use something like public message boards to pass secrets anonymously and non-interactively (similar to TV/Movie Trope : http://tvtropes.org/pmwiki/pmwiki.php/Main/PublicSecretMessage )...
2
votes
0answers
123 views
Merkle tree to prove integrity of subset of data
I'm thinking up a scheme where a merkle tree is used to ensure integrity of a set of data items, and different parties are allowed to verify the integrity of different subsets of that data.
Let's ...
2
votes
1answer
407 views
Is zero IV with AES-CBC safe if CPA is not possible and indistinguishability is not an issue?
Is using zero IVs with AES-CBC safe, if chosen-plaintext attack (CPA) is not possible and ciphertext indistinguishability is not an issue?
Practical example:
...
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0answers
68 views
Any algorithm with a pair of master keys and multiple pairs of subkey for a secure key escrow?
Note: This question looks like my other question — Any algorithm with a master key for decrypting private key encrypted messages? — which is perfectly answered by @real-or-random, but this one is ...
0
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1answer
660 views
Any algorithm with a master key for decrypting private key encrypted messages?
Are there any algorithm out there that implements following scenario?
Create a master private key
Create a private/public key #1 based on the master key
Create a private/public key #2 based on the ...
0
votes
1answer
142 views
Understanding the big picture with regard to how anonymous credentials work
I'm trying to learn about anonymous credential systems. I started with Lysyanskaya's thesis, which gives an outline of how to build an AC system given some particular primitives (signature scheme, ...
1
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0answers
82 views
Proving to have sent data, without revealing it
This may be easy, but I'm struggling to find a reasonable solution now.
Alice wants to send data to Bob.
The data that Alice wants to send has been verified by Carl in some way, even though Carl has ...
1
vote
1answer
109 views
Zero-knowledge voting with hidden weights
Assume a voting with delegates, where each delegate's vote $v_i \in \{-1,1\}$ has a certain weight $w_i$ depending on the number of people who elected the delegate.
Is there a way to calculate the ...
0
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1answer
55 views
Increasing Entropy of Limited Information / ID
Supposed that I get an ID from third party (in this case, Telegram ID which is the range $-2^{31}$ to $2^{31}-1$). I want to store the ID securely and privately into my database by hashing it. I don'...
0
votes
2answers
186 views
Format Preserving Encryption after compression algorithm?
I have large data set which has sensitive information. I want to encrypt different parts of it with different keys. There is also need for compression as data is very large (100s of GB that has to be ...
2
votes
1answer
85 views
Join Datasets While Protecting Anonymity
I've run into this issue a couple of times in my career. I'll see if I can explain with an example (please ignore the fact that this is implausible in the real-world).
Suppose I sell computers, and I ...
0
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1answer
324 views
Comparing two committed values
Given two commitments on different values, Can a third party compare those two commitments to know which one is the higher value?
4
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1answer
406 views
Differential Privacy: why $\delta$ negligible on the row numbers?
The definition of differential privacy says that an algorithm $M$ is $(\epsilon,\delta)$-differentially private if
$$P(M(x \in D) \in S)\leq e^\epsilon P(M(x \in D')\in S) + \delta$$
where $D,D'$ ...
1
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1answer
86 views
Disk/File modes of encryption and authentication [closed]
Secure disk/file encryption has been actively studied over the years. Beside XTS and CBC-ESSIV, are there any other modes of encryption that are commonly used? Which could be the most secure mode?
...
7
votes
2answers
817 views
Integrity with anti-confidentiality
The Republic of Brutopia are updating the design of their library cards with a new security feature: a 2D barcode containing a cryptographically signed copy of the human-readable fields on the card. ...
2
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0answers
201 views
Evaluate similarity between two “encrypted” time series
Can you think of any way to evaluate the similarity between two time series without revealing any information on the time series ?
More precisely, considering two time series $x$ and $y$ of length ...
