Browse Definitions :
Definition

rolling code

Contributor(s): Ivy Wigmore

Rolling code, also known as hopping code, is a security technology commonly used to provide a fresh code for each authentication of a remote keyless entry (RKE) or passive keyless entry (PKE) system. The use of rolling codes prevents replay attacks, in which an eavesdropper accesses and records the code sent and then replays it to breach the system.

In a non-cryptographic system for rolling code, the transmitter and receiver use the same pseudo-random number generator (PRNG), which maintains information about the last code that was used and a calculation to be performed. Performing the calculation results in the generation of a non-repeating and specific sequence of numbers. When one end of the communication -- the key fob, for example, or the module in the vehicle -- transmits the next number in the sequence, the other end can check it with its own PRNG. A current system might use a 40-bit rolling code for about a trillion possible codes. 

If the code matches, the system authenticates and the car door unlocks. Otherwise, the system will roll through the sequence of numbers looking for the one that was sent. Each successful use of the system results in synchronization of the end points, which means that the system should work on the first try next time.

Cryptographic rolling code systems add the further element of a secret key that is shared by the transmitter and receiver.

This was last updated in April 2017

Continue Reading About rolling code

Start the conversation

Send me notifications when other members comment.

Please create a username to comment.

-ADS BY GOOGLE

File Extensions and File Formats

Powered by:

SearchCompliance

SearchSecurity

  • time-based one-time password (TOTP)

    A time-based one-time password (TOTP) is a temporary code, generated by an algorithm, for use in authenticating access to ...

  • Security Operations Center (SOC)

    A security operations center (SOC) is a command center facility for a team of IT professionals with expertise in information ...

  • incident response team

    An incident response team is a group of IT professionals in charge of preparing for and reacting to any type of organizational ...

SearchHealthIT

SearchDisasterRecovery

  • disaster recovery team

    A disaster recovery team is a group of individuals focused on planning, implementing, maintaining, auditing and testing an ...

  • cloud insurance

    Cloud insurance is any type of financial or data protection obtained by a cloud service provider. 

  • business continuity software

    Business continuity software is an application or suite designed to make business continuity planning/business continuity ...

SearchStorage

  • storage class memory (SCM)

    Storage class memory (SCM) is a type of NAND flash that includes a power source to ensure that data won't be lost due to a system...

  • Hadoop as a service (HaaS)

    Hadoop as a service (HaaS), also known as Hadoop in the cloud, is a big data analytics framework that stores and analyzes data in...

  • blockchain storage

    Blockchain storage is a way of saving data in a decentralized network which utilizes the unused hard disk space of users across ...

Close