Untraceable off-line cash in wallet with observers
CRYPTO '93 Proceedings of the 13th annual international cryptology conference on Advances in cryptology
Handbook of Applied Cryptography
Handbook of Applied Cryptography
Resistance against Differential Power Analysis for Elliptic Curve Cryptosystems
CHES '99 Proceedings of the First International Workshop on Cryptographic Hardware and Embedded Systems
Guide to Elliptic Curve Cryptography
Guide to Elliptic Curve Cryptography
New Point Addition Formulae for ECC Applications
WAIFI '07 Proceedings of the 1st international workshop on Arithmetic of Finite Fields
Anonymous credentials on a standard java card
Proceedings of the 16th ACM conference on Computer and communications security
Privacy for public transportation
PET'06 Proceedings of the 6th international conference on Privacy Enhancing Technologies
Developing efficient blinded attribute certificates on smart cards via pairings
CARDIS'10 Proceedings of the 9th IFIP WG 8.8/11.2 international conference on Smart Card Research and Advanced Application
Elliptic curve cryptography on the WISP UHF RFID tag
RFIDSec'11 Proceedings of the 7th international conference on RFID Security and Privacy
| Hi-index | 0.00 |
Electronic cash is a suitable solution for payment systems, in which the user's identity should not be revealed during the payment. This is for example the case for public transportation payment systems. One electronic cash scheme, efficient during the spending phase, was proposed by Brands'. This scheme, as all privacy-preserving payment schemes, is based on public-key cryptography. However, payment devices used in those systems need to be cheap and low-power, which restricts their computational performance. These two points conflict with the need for payments to be executed quickly, in order to avoid delays at the entrance points of the system. In this work we demonstrate that using sophisticated implementation techniques, it is possible to realize full-size e-cash schemes even on inexpensive payment tokens. We present a full implementation of Brands' offline cash scheme for the UMass Moo, a computational RFID-token. The spending protocol, which is the time critical part in transportation payment systems can be executed in 13 ms. This meets real-world application requirements. The reloading of the card, which is less time critical, as it is conducted offline, is time consuming. We discuss solutions to this problem.