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Method and apparatus for nonlinear IV setup in keystream generators
US9130739B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9130739-B2 |
| Application number | US-201214112635-A |
| Country | US |
| Kind code | B2 |
| Filing date | Apr 12, 2012 |
| Priority date | Apr 21, 2011 |
| Publication date | Sep 8, 2015 |
| Grant date | Sep 8, 2015 |
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Abstract
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The invention concerns the contact-less technology MIFARE, and describes a method to update a state by injecting an IV using a non-linear feedback shift register that makes use of only look-up tables and basic operations on 8-bit words.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method to perform a “reader challenge setup step in an authentication phase”, according to MIFARE contact-less technology authentication and encryption protocol, in a “tag device”, wherein, a size of an internal state of a cipher, called “ST” is 6 bytes, at time t, the internal state of the cipher is represented by ST t =(ST t [0], . . . , ST t [5]), a reader challenge, called “RC “, of length 4 bytes, is denoted by: RC=(RC[0], RC[3]) a linear functi…
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- H04L9/0668Primary
Electricity · mapped topic
Electricity · mapped topic
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Frequently asked questions
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- What does patent US9130739B2 cover?
- The invention concerns the contact-less technology MIFARE, and describes a method to update a state by injecting an IV using a non-linear feedback shift register that makes use of only look-up tables and basic operations on 8-bit words.
- Who is the assignee on this patent?
- Gouget Aline, Paillier Pascal, Gemalto Sa
- What technology area does this patent fall under?
- Primary CPC classification H04L9/0668. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Sep 08 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).