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New Approaches to Traitor Tracing with Embedded Identities
traitor tracing public-key cryptography
2019/8/30
In a traitor tracing (TT) system for nn users, every user has his/her own secret key. Content providers can encrypt messages using a public key, and each user can decrypt the ciphertext using his/her ...
A traitor tracing scheme is a public key encryption scheme for which there are many secret decryption keys. Any of these keys can decrypt a ciphertext; moreover, even if a coalition of users collude, ...
In this work we provide a traitor tracing construction with ciphertexts that grow polynomially in log(n) where n is the number of users and prove it secure under the Learning with Errors (LWE) assumpt...
Risky Traitor Tracing and New Differential Privacy Negative Results
Traitor Tracing Differential Privacy
2017/11/27
Finally, we can capture impossibility results for differential privacy from risky traitor tracing. Since our ciphertexts are short (O(λ)O(λ)), thus we get the negative result which matches what one wo...
Attribute Based Encryption: Traitor Tracing, Revocation and Fully Security on Prime Order Groups
Traitor Tracing Revocation Ciphertext-policy Attribute Based Encryption
2016/12/15
A Ciphertext-Policy Attribute-Based Encryption (CP-ABE) allows users to specify the access policies without having to know the identities of users. In this paper, we contribute by proposing an ABE sch...
Strong Hardness of Privacy from Weak Traitor Tracing
differential privacy traitor-tracing indistinguishability obfuscation
2016/7/22
Despite much study, the computational complexity of differential privacy remains poorly understood. In this paper we consider the computational complexity of accurately answering a family QQ of statis...
In the field of collusion-resistant traitor tracing, Oosterwijk et al. recently determined the optimal suspicion
function for simple decoders. Earlier, Moulin also considered another type of decoder:...
We introduce the k-LWE problem, a Learning With Errors variant of the k-SIS problem. The Boneh-Freeman reduction from SIS to k-SIS suffers from an exponential loss in k. We improve and extend it to a...
Practical Attribute-Based Encryption: Traitor Tracing, Revocation, and Large Universe
Attribute-Based Encryption Traitor Tracing Revocation
2016/1/8
In Ciphertext-Policy Attribute-Based Encryption (CP-ABE), a user's decryption key is associated with attributes which in general are not related to the user's identity, and the same set of attributes ...
Tally-based simple decoders for traitor tracing and group testing
traitor tracing Tardos code collusion
2016/1/6
In this paper we construct a score system from the Neyman-Pearson hypothesis test (which is known to be the most powerful test possible) into which we feed all the evidence available to the tracer, in...
Generalised tally-based decoders for traitor tracing and group testing
traitor tracing group testing fingerprinting
2015/12/29
We propose a new type of score function for Tardos traitor tracing codes. It is related to the recently introduced tally-based score function, but it utilizes more of the information available to the ...
Anonymous Traitor Tracing: How to Embed Arbitrary Information in a Key
public-key cryptography Traitor tracing
2015/12/24
In a traitor tracing scheme, each user is given a different decryption key. A content distributor can
encrypt digital content using a public encryption key and each user in the system can decrypt it ...
Barriers to Black-Box Constructions of Traitor Tracing Systems
two-party computation Secure Multiparty Computation
2015/12/21
Reducibility between different cryptographic primitives is a fundamental problem in modern
cryptography. As one of the primitives, traitor tracing systems help content distributors recover
the ident...
A traitor tracing system enables a publisher to trace a pirate decryption box to one of the secret keys used to create the box. We present the first traitor tracing system where ciphertext size is "co...
Multiparty Key Exchange, Efficient Traitor Tracing, and More from Indistinguishability Obfuscation
Multiparty Key Exchange Effi cient Traitor Tracing
2015/8/5
Our traitor tracing system is fully collusion resistant with short ciphertexts, secret keys,
and public key. Ciphertext size is logarithmic in the number of users and secret key size is
independent ...