Data privacy refers to (cryptographic) methods to prevent the disclosure of sensitive (identifying) information of persons.

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Scrambling sensor data [on hold]

I want to build a device that would scramble a signal coming from a sensor, so that only a person with the correct key can possibly read the data from that sensor. The sensor itself and the system of ...
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Epsilon Differential privacy using laplace distribution

Given Database X={x_1 ,x_2 ,...X_n} where x_i represent a bit Let f(x) = Sum x_i for 1 <= i <= n Let Y ~laplace(1/(epsilon)) I succeeded proving that Mechanisms: M1(x)= Y-f(x) and M2(x)= ...
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Epsilon Differential Privacy when using a random function [closed]

First of all, this is homework. I have a question that wants me to prove the following: Given a Database X, where x_i is {0,1} and an Algorithm A that randomly chooses an i and returns x_i, I need to ...
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PKCS12 - private key protection [migrated]

I know that PKCS12 private key is protected by a password, but what is actually done with the password ? Does it use PBKDF to derive the key from password ? That would be a problem as if you change ...
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Secure multiparty computation of conjunction

Suppose Alice and Bob each have bits a and b, respectively. How can Alice and Bob compute the function ...
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How do I safely anonymize/hash a unique identifier to protect privacy?

I am building a system to collect a unique identifier (MAC addresses from 802.11 probe requests). The system will have several collection points over a large area, submitting to a central database. I ...
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Does Ciphertext policy ABE support search operation on encrypted data

Basically CP-ABE (or attribute based encryption) allows end-users to encrypt the data with desired access control structure. I was investigating the how to do keyword-search on encrypted data given ...
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On the privacy of perfect hash functions

I'm digging into the several algorithms for building (Minimal) Perfect Hash Functions. It seems that the recent works provide quite a few very efficient algorithms. However, I'm wondering how a ...
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Are SSL/TLS used for maintaining data confidentiality?

In SSL/TLS, we use symmetric and asymmetric keys to encrypt the data. Does that mean that the keys are used to encrypt the data (preserve the integrity) or provide a secure channel for the data to be ...
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Privacy-Preserving relational databases: checking the existence of a record (or multiple records)

I would like to know if there exists a protocol which performs the following operation in a privacy-preserving fashion: User $U$ wants to know whether a record is stored in the database. The primary ...
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NTRU crypto from unseen.is; myth busting help

I am always on the look out for privacy enhancing technologies. I stumbled upon the service from unseen.is. I had a look at their site (specifically here) and even though I lack knowledge there are a ...
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Unique, anonymous online authentication

Is there a way to authenticate users online without knowing their real identity yet preventing them from registering twice? If not, what is the least amount of information you would need? If it helps, ...
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Oblivious Transfer where neither party learns the index of the message

In a traditional Oblivious Transfer setting, the sender has a list $(x_1, x_2, ... , x_n) \in G$ where $G$ is the chosen group. The receiver has $b \in \mathbb{N}$, such that engaging in the protocol ...
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How can user privacy be preserved in certificateless cryptography?

In certificateless cryptography, how can a user preserve his privacy from Key Generation Center? If the KGC becomes malicious, how can the user's privacy be preserved? I read "Privacy-Preserving ...
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Is the following aggregation scheme private?

Is the following scheme private? By private i mean an untrusted aggregator (UA) cannot reveal anything other then an aggregate function output on plaintext data Each party holds a secret key $k_i$ ...