Concept

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Publications associées (67)

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Cryptosystems and LLL

Thomas Baignères

Since the late 70’s, several public key cryptographic algorithms have been proposed. Diﬃe and Hellman ﬁrst came with this concept in 1976. Since that time, several other public key cryptosystems were invented, such as the well known RSA, ElGamal or Rabin c ...

2006

Fraud within Asymmetric Multi-Hop Cellular Networks

Gildas Avoine

At Financial Cryptography 2003, Jakobsson, Hubaux, and Buttyan suggested a lightweight micro-payment scheme aimed at encouraging routing collaboration in asymmetric multi-hop cellular networks. We will show in this paper that this scheme suffers from some ...

2005

Revisiting Liveness Properties in the Context of Secure Systems

Felix Gaertner

Distinguishing trace-based system properties into safety properties on the one hand and liveness properties on the other has proven very useful for specifying and validating concurrent and fault-tolerant systems. We study the adequacy of these abstractions ...

2002

Method for transmitting payment information between a terminal and a third equipment

Levente Buttyan

NOVELTY - Secret data is generated in one terminal or user equipment. Secret or hash value of secret is displayed on display terminal (11) or user equipment and is entered on input element of other terminal or user equipment. Shared secret data is used to ...

2001

Method for securing communications between a terminal and an additional user equipment

Levente Buttyan

Method for performing electronic payments between a mobile equipment and a payment terminal over a short distance wireless interface, comprising displaying an identification (for example T; T-id) on the display (110) of said payment terminal (11), manually ...

2000

Accountable Anonymous Service Usage in Mobile Communication Systems

Jean-Pierre Hubaux, Levente Buttyan

We introduce a model that allows of anonymous yet accountable service usage in mobile communication systems. This model is based on the introduction of a new business role, called the customer care agency, and a ticket based mechanism for service access. W ...

1999

Chinese remaindering based cryptosystems in the presence of faults

Arjen Lenstra

We present some observations on public key cryptosystems that use the Chinese remaindering algorithm. Our results imply that careless implementations of such systems could be vulnerable. Only one faulty signature, in some explained context, is enough to re ...

Springer Verlag1999