In this paper we study the impact of channel capture following a busy period on collision probabilities in a saturated IEEE 802.11 network. A new analytical model that takes into account the previous channel status is proposed to obtain collision probabilities. Using simulation, we show that the well-known fixed point analysis, which is a special case of the new model, becomes more accurate as ...

Wagner, Goldberg and Briceno have recently published an attack [2] on what they believe to be Comp128, the GSM A3A8 authentication hash function [1]. Provided that the attacker has physical access to the card and to its secret PIN code (the card has to be activated), this chosen plaintext attack recovers the secret key of the personalized SIM (Secure Identification Module) card by inducing coll...

This paper shows how satellite owner/operators may use sequential estimates of collision probability, along with a prior assessment of the base risk of collision, in a compound hypothesis ratio test to inform decisions concerning collision risk mitigation maneuvers. The compound hypothesis test reduces to a simple probability ratio test, which appears to be a novel result. The test satisfies to...

Satellites in a formation might need to maneuver to avoid potential collisions that may occur when foreign objects enter the formation, or when a satellite within the formation drifts into the path of another. In either case we seek to determine the probability of a future collision based on current state knowledge and the uncertain dynamic environment, and further to determine a control strate...

The RFID technology is affected by the reader-to-reader collision problem. Several studies propose anti-collision protocols. A high throughput adaptation protocol based on time division is Colorwave. A known mechanism, already applied to another time division protocol to improve its performance, is the introduction of a probability factor in the collision resolution routine. In this work, the e...