A NLFSR is a common component in modern stream cipher

Stream cipher

In cryptography, a stream cipher is a symmetric key cipher where plaintext digits are combined with a pseudorandom cipher digit stream . In a stream cipher the plaintext digits are encrypted one at a time, and the transformation of successive digits varies during the encryption...

s, especially in RFID and smartcard applications. NLFSRs are known to be more resistant to cryptanalytic attacks than Linear Feedback Shift Registers (LFSRs), although construction of large NLFSRs with guaranteed long periods remains an open problem.

See also

NLFSR-based ciphers:

• Achterbahn
  Achterbahn
  In cryptography, Achterbahn is the name of a synchronous stream cipher algorithmsubmitted to the eSTREAM Project of the eCRYPT network.In the final specification the cipher is called ACHTERBAHN-128/80,...
  
  
• Grain
  Grain (cipher)
  Grain is a stream cipher submitted to eSTREAM in 2004 by Martin Hell, Thomas Johansson and Willi Meier. It has been selected for the final eSTREAM portfolio for Profile 2 by the eSTREAM project. Grain is designed primarily for restricted hardware environments. It accepts an 80-bit key and a...
  
  
• KeeLoq
  KeeLoq
  KeeLoq is a proprietary hardware-dedicated NLFSR-based block cipher. The uni-directional command transfer protocol was designed by Frederick Bruwer, PhD, CEO at Nanoteq Ltd and the cryptographic algorithm was created by Professor Gideon Kuhn with the silicon implementation by Willem Smit, PhD, at...
  
   algorithm
• RFID
• Trivium
  Trivium (cipher)
  Trivium is a synchronous stream cipher designed to provide a flexible trade-off between speed and gate count in hardware, and reasonably efficient software implementation....
  
  
• VEST
  VEST
  VEST ciphers are a set of families of general-purpose hardware-dedicated ciphers that support single pass authenticated encryption and can operate as collision-resistant hash functions designed by Sean O'Neil, Benjamin Gittins and Howard Landman...