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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 ...
Group signatures allow users of a group to sign messages anonymously in the name of the group, while incorporating a tracing mechanism to revoke anonymity and identify the signer of any message. Since...
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, ...
Cost-Effective Private Linear Key Agreement With Adaptive CCA Security from Prime Order Multilinear Maps and Tracing Traitors
broadcast encryption private linear key agreement traitor tracing
2018/5/28
Private linear key agreement (PLKA) enables a group of users to agree upon a common session key in a broadcast encryption (BE) scenario, while traitor tracing (TT) system allows a tracer to identify c...
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...
Side-Channel Attacks on BLISS Lattice-Based Signatures -- Exploiting Branch Tracing Against strongSwan and Electromagnetic Emanations in Microcontrollers
BLISS branch tracing SPA
2017/6/5
In this paper, we investigate the security of the BLISS lattice-based signature scheme, one of the most promising candidates for post-quantum-secure signatures, against side-channel attacks. Several w...
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...
Demands for lawful access to encrypted data are a long standing obstacle to integrating
cryptographic protections into communication systems. A common approach is to allow a trusted
third party (TTP...
TRACING ATTACKS ON U-PROVE WITH REVOCATION MECHANISM
anonymous credential U-Prove revocation
2016/1/4
Anonymous credential systems have to provide strong privacy protection:
a user may prove his (chosen) attributes without leaking
neither his identity nor other attributes. In this paper we consider
...