Patent · US Active

Efficient remotely-keyed symmetric cryptography for digital rights management

US7773753B2 · kind B2 · utility

6Cited by

1References

8Claims

0Family size

Assignee

Aladdin Knowledge Systems Ltd. · IL

Inventors

Michael Zunke · Tauberbischofsheim, DE
Yanki Margalit · Ramat Gan, IL
Dani Margalit · Ramat Gan, IL

Key dates

Filing date	Jun 28, 2007
Grant date	Aug 10, 2010
Priority date	—
Expiry date	Mar 28, 2029

Classification

Technology area (CPC H)Electricity
CPC primaryH04L2209/603
WIPO fieldDigital communication
WIPO sectorElectrical engineering

Abstract

An efficient symmetrical-cryptographic method for using a fast but insecure host to perform encryption/decryption based on a secret key in a secure, but slow hardware token, such as a smartcard or similar device, without revealing the secret key to the host, and such that the ciphertext and plaintext are exactly the same size. The present method is suitable for use in Digital Rights Management and Software Rights Management applications which require precise interchangeability of ciphertext and plaintext in pre-allocated areas of data storage.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.