Questions tagged [anonymity]
Anonymity describes the state of being unknown or unacknowledged.
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High-latency anonymous communication minimum delay?
High-latency anonymous communication (e.g. Mixmaster and Mixminion) delay messages for a long time using mixers to anonymous communications. I understand that it has applications for email and p2p but ...
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Combating Traffic analysis Msc Dissertation ideas [closed]
I have started my MSc dissertation on anonymity (how to beat traffic analysis techniques) and i'm looking for practical ideas. What tactics and software technology would be that guarantees private ...
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Check if two anonymously signed messages have the same author
I need digital signature scheme with following rules:
Signature is "anonymous" which means it doesn't expose author identity (See papers in this answer. Anonymous RSA version or Boneh-Boyen algorithm ...
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What is the difference between "Linkable" and "Traceable" Ring Signatures?
In particular, both papers on Traceable Ring Signatures and Linkable Ring Signatures propose they are fit for the creation of ballots. The Wikipedia Article on Ring Signatures, though, suggests ...
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Choice of bilinear group for implementation of BLS signature with NIWI proof?
I am trying to sign the multiple (millions of) different readings but the receiver should not be able to link multiple signed readings together (unlinkability) or with the identity of the signer (...
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Alice answering Bob without knowing the question
I'm a student and I don't know how to solve the following problem :
Alice is proposing a 10 questions list to Bob.
Bob choose only 1 question and wants to know the answer without Alice knowing the ...
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David Chaum's anonymous credential
I am a newbie in cryptography (I know the basic RSA, AES stuffs) and am interested in anonymous authentication systems. Looks like David Chaum is the godly figure in the field. I see lots of people ...
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State of the art techniques for Anonymous Authentication?
What are the state of the art techniques for Anonymous Authentication? What are the most popular ones? The problem domain I am considering is with respect to different users accessing cloud content; ...
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Why is Tor alone not enough to guarantee anonymity for Bitcoin?
Why is Tor alone not enough to guarantee anonymity for Bitcoin?
Why do we need the constructions like Zerocoin?
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Are Anonymity and Authentication possible together?
Anonymity and authentication look to be seemingly contradictory but are both possible together ? I tried reading couple of papers but could not get the big picture. So what are the major approaches ...
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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 ...
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anonymous signature implementation and usage?
This is one of the question asked in my class. Implement a anonymous digital signature. So it means hiding signers information. i could not find any article in anonymous digital signing. Also another ...
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During electronic voting, how does one hide the choice from Voting device?
Assume the following: I want to cast a vote during an election through an electronic voting system. For our system we make the assumption that the device one uses to cast the vote is potentially ...
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Anonymisation resilient to key leak
Problem statement
Elbonian citizens have been issued a card holding a random $B_j\in\{0,1\}^b$, $0\le j<2^n$, $b\ge n+20$ (representative example $b=64$, $n=28$). The habit has grown to use this ...
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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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How can one encrypt with RSA (or ElGamal) without revealing whom the ciphertext is intended for?
Imagine Alice wants to encrypt for Bob and post this encryption publicly, so that only Bob can decrypt but no one can other than Alice or Bob tell that the message was encrypted for Bob.
The naive ...
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Group Signature Scheme without Opening but with Revocation
After reading many papers about group signature schemes, I saw that basically all of them employ the possibility of "signature opening": The Group Manager (GM) can identify any signature made by his ...
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Is Bitmessage a Mix network?
I've read the Bitmessage whitepaper and I found it rather lacking on the details, but it promises anonymous routing. Can it be considered a variation on mix-networks, where each peer acts as a mix-...
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Can you show how that RSA does/doesn't provide anonymity?
Considering a CPA-secure version of RSA where the ciphertext is just a rundom element from $Z^*_N$. Does that meet the anonymity requirement in which an cpa adversary cannot distinguish between a ...
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Private Messaging
Suppose Alice and Bob wants to send messages through Sue without revealing to Eve that the exchange took place. Slightly more formally, I don't want Eve to have any advantage telling if Alice is ...
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How does Dissent protect against Sybil Attacks?
Dissent claims to be able to be resistant to Sybil attacks.
Dissent seeks to offer accountable anonymity, giving users strong guarantees of anonymity while also protecting online groups or forums ...
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Snowden Challenge II: Can we solve Snowden challenge quantumly? [closed]
Suppose that tomorrow is July 7, 2050 and Snowden is still stayed in Sheremetyevo airport. Further, let us suppose that quantum computation and quantum commincation are available to everyone, and ...
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Cryptographic Challenge: How to Say Something Confidentially to Snowden?
The Snowden situation raises an intereting cryptograpic problem. At present, how can something be sent confidentially to Snowden?
Claim:
I have no particular political orientation. The above ...
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Tor's integrity verification system?
I am trying to understand the design of Tor(onion router). I am reading the original paper on the 2nd generation onion routing system. Where, under integrity checking on streams, they say, "When Alice ...
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Can you identify the public key used to encrypt something?
If I encrypt a string with a public key, does the encrypted ciphertext reveal the public key I used to encrypt it? Basically, I don't want anyone to know who the ciphertext is addressed to.
I'm ...
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Key Exchange and anonymity issue
If Alice (sender) sends a private message embedded with public key of the Bob(recipient) through onion network, so in this key exchange, does Bob remains anonymous to Alice as Alice knows about the ...
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Anonymity in end-to-end encryption
Considering a scenario of anonymous data transfer between seller and buyer using proxies. If we consider that there are three proxies that are being selected by the buyer to obtain data from different ...
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Can a LIRA system work with cjdns or other decentralized meshnets?
LIRA (Lightweight Incentivized Routing for Anonymity) is a scheme to incentivize participants in Tor to contribute resources, in particular bandwidth.
The paper talks about it being used for Tor. Can ...
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What crypto system allows for 3 parties: Party 1 who makes an assertion, Party 2 mutates the assertion, Party 3 validates it
I'm looking for the cryptographic equivalent of a Drivers license where the issuer can be verified, the issuer doesn't need to know who you showed the drivers license to, but also allows per-...
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Current Status of mixnets for voting
I am currently doing some research on universally verifiable mixnets, but it seems to me that there are too few papers about them after 2006 or so and most of them come from the team of Douglas ...
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Is it possible to create a Bilinear Function with Already Assigned "Multiplicative" Input Groups?
Assume that we have an already assigned Multiplicative Cyclic Group $\mathbb Z_p^*$ with order $q=p-1$, and $p$ is a prime number, is it possible to create a bilinear function $\hat{e}: \mathbb Z_p^* \...
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Approach towards anonymous e-voting
I want to implement an internet-based e-voting system.
Voters shall be able to cast their vote for one out of n possible candidates. Each candidate has his own ballot-box kept by and at a trustworthy ...
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Anonymous trust/reputation system
Suppose there are 3 persons, Alice, Bob and Peter.
They are identified by their pseudonyms (public RSA keys).
Alice has a key Alice, Bob has ...
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Is there any serious discussion about using blinding intermediaries in digital currency scenarios?
A digital currency system like Lucre (OpenTransaction) creates a coin by a mint blind signing the output of a hash function, which the payer then unblinds and pairs with the input to the has function.
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