Browse Definitions :
Definition

rolling code

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

SearchNetworking
  • cloud-native network function (CNF)

    A cloud-native network function (CNF) is a service that performs network duties in software, as opposed to purpose-built hardware.

  • Wi-Fi 6E

    Wi-Fi 6E is one variant of the 802.11ax standard.

  • microsegmentation

    Microsegmentation is a security technique that splits a network into definable zones and uses policies to dictate how data and ...

SearchSecurity
  • MICR (magnetic ink character recognition)

    MICR (magnetic ink character recognition) is a technology invented in the 1950s that's used to verify the legitimacy or ...

  • What is cybersecurity?

    Cybersecurity is the protection of internet-connected systems such as hardware, software and data from cyberthreats.

  • Android System WebView

    Android System WebView is a system component for the Android operating system (OS) that allows Android apps to display web ...

SearchCIO
  • privacy compliance

    Privacy compliance is a company's accordance with established personal information protection guidelines, specifications or ...

  • contingent workforce

    A contingent workforce is a labor pool whose members are hired by an organization on an on-demand basis.

  • product development (new product development -- NPD)

    Product development, also called new product management, is a series of steps that includes the conceptualization, design, ...

SearchHRSoftware
  • talent acquisition

    Talent acquisition is the strategic process employers use to analyze their long-term talent needs in the context of business ...

  • employee retention

    Employee retention is the organizational goal of keeping productive and talented workers and reducing turnover by fostering a ...

  • hybrid work model

    A hybrid work model is a workforce structure that includes employees who work remotely and those who work on site, in a company's...

SearchCustomerExperience
  • hockey stick growth

    Hockey stick growth is a growth pattern in a line chart that shows a sudden and extremely rapid growth after a long period of ...

  • Salesforce Trailhead

    Salesforce Trailhead is a series of online tutorials that coach beginner and intermediate developers who need to learn how to ...

  • Salesforce

    Salesforce, Inc. is a cloud computing and social enterprise software-as-a-service (SaaS) provider based in San Francisco.

Close