A course in number theory and cryptography
A course in number theory and cryptography
How to prove yourself: practical solutions to identification and signature problems
Proceedings on Advances in cryptology---CRYPTO '86
On blind signatures and perfect crimes
Computers and Security
Untraceable off-line cash in wallet with observers
CRYPTO '93 Proceedings of the 13th annual international cryptology conference on Advances in cryptology
Improved privacy in wallets with observers
EUROCRYPT '93 Workshop on the theory and application of cryptographic techniques on Advances in cryptology
IEEE Spectrum - Special issue: electronic money
Discrete Logarithms: The Past and the Future
Designs, Codes and Cryptography - Special issue on towards a quarter-century of public key cryptography
Handbook of Applied Cryptography
Handbook of Applied Cryptography
The ESPRIT Project CAFE - High Security Digital Payment Systems
ESORICS '94 Proceedings of the Third European Symposium on Research in Computer Security
Cryptographically Strong Undeniable Signatures, Unconditionally Secure for the Signer
CRYPTO '91 Proceedings of the 11th Annual International Cryptology Conference on Advances in Cryptology
Wallet Databases with Observers
CRYPTO '92 Proceedings of the 12th Annual International Cryptology Conference on Advances in Cryptology
An Efficient Off-line Electronic Cash System Based On The Representation Problem.
An Efficient Off-line Electronic Cash System Based On The Representation Problem.
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PC franking systems allow customers to download postage value into their PCs and to print postage value onto envelopes or mailing labels by using regular desktop printers connected to their PCs. In emerging standards, such as the IBIP program of the US postal services, the resulting imprints are called indicia, and they are printed as 2-D bar codes that are easy and reliable to scan while passing through the mail delivery system. In contrast to the IBIP program, which requires a tamper responsive postal security device for each customer, we propose a pure software solution for PC franking systems that is more secure for the postal services, gives more privacy to the customers and has the potential of being much cheaper than any IBIP compliant franking system. In contrast to existing PC-franking products that require no hardware postal security device, our solution works off-line. Customers are not required to be online while printing indicia. Our solution operates an existing offine e-cash scheme over certain elliptic curves rather than over finite fields.