Patent
Encryption method using a derived key applicable at multiple levels of encryption strength
Rayne Mark Wentworth
- 14 Sep 1998
5
TL;DR: In this article, an encryption method and apparatus is presented in which a cryptographic encryption key K for use to encrypt or decrypt communications is first derived from a cryptographic key Kd provided by a user.
read more
Abstract: An encryption method and apparatus in which a cryptographic encryption key K for use to encrypt or decrypt communications is first derived from a cryptographic key Kd provided by a user. The derived encryption key is used to encrypt or decrypt communications at a selected level of encryption strength. The level of encryption strength is selected in accordance with whether or not the cryptographic key provided by the user has a particular property, such as including a particular sequence of bits, dividing exactly by a particular number, or whether a particular cryptographic check value S can be derived from it. This method prevents unauthorised users from using the apparatus at full encryption strength since the key they provide will probably not have the required properties or generate the required check value. Also described is a method and apparatus for generating a certified cryptographic key by combining the user key Kd with a check value derived from it.
read more
Chat with Paper
AI Agents for this Paper
Find similar papers on Google Scholar, PubMed and Arxiv
Write a critical review of this paper
Analyze citations of this paper to find unaddressed research gaps
Citations
Patent
Method for undetectably impeding key strength of encryption usage for products exported outside the U.S
Richard L. Robinson
- 13 Sep 2005
TL;DR: In this article, a communication device includes a key strength controlling agent that can determine, from a restriction identifier, whether the cryptographic key strength is restricted; when the key is restricted, cause the use of a second cryptographic key having a second key strength.
23
Patent
Method and device for providing at least one secure cryptographic key
Rainer Falk
- 14 Feb 2011
TL;DR: In this paper, the authors proposed a control device for providing at least one secure cryptographic key for performing a cryptographic security function (SF) using a control devices which requires a cryptographic key therefor.
13
Patent
Verifiable generation of weak symmetric keys for strong algorithms
Robert R. Gilman
- 02 Feb 2007
TL;DR: In this paper, a method, system, and device for producing cryptographic keys is described, where the cryptographic keys may be produced such that they have an effective key size and an apparent key size that differs from the effective key sizes.
8
Patent
Verfahren und vorrichtung zum bereitstellen mindestens eines sicheren kryptographischen schlüssels
Rainer Falk
- 14 Feb 2011
TL;DR: The vorliegende erfindung betrifft eine Vorrichtung (1) zum Bereitstellen mindestens eines sicheren kryptographischen Schlussels fur die Ausfuhrung einer kryptographsichen Sicherheitsfunktion (SF) durch ein Steuergerat (2), das dafur einen kryptographic Schlussel anfordert, wobei aus einem ersten Konfigurationsspeicher (7) e
4
Patent
Method for undetectably impeding encryption key strength for products exported to other countries
Richard L. Robinson
- 05 Sep 2006
TL;DR: In this article, a communication device includes a key strength controlling agent that can determine, from a restriction identifier, whether the cryptographic key strength is restricted; when the key is restricted, cause the use of a second cryptographic key having a second key strength.
2