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Tiberius Brastaviceanu

Access control - Wikipedia, the free encyclopedia - 0 views

en.wikipedia.org/...Access_control

blockchainaccess_project wikipedia paper access passport IoPA tech

shared by Tiberius Brastaviceanu on 09 Jun 16 - No Cached
  • The act of accessing may mean consuming, entering, or using.
  • Permission to access a resource is called authorization.
  • Locks and login credentials are two analogous mechanisms of access control.
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  • Geographical access control may be enforced by personnel (e.g., border guard, bouncer, ticket checker)
  • n alternative of access control in the strict sense (physically controlling access itself) is a system of checking authorized presence, see e.g. Ticket controller (transportation). A variant is exit control, e.g. of a shop (checkout) or a country
  • access control refers to the practice of restricting entrance to a property, a building, or a room to authorized persons
  • can be achieved by a human (a guard, bouncer, or receptionist), through mechanical means such as locks and keys, or through technological means such as access control systems like the mantrap.
  • Physical access control is a matter of who, where, and when
  • Historically, this was partially accomplished through keys and locks. When a door is locked, only someone with a key can enter through the door, depending on how the lock is configured. Mechanical locks and keys do not allow restriction of the key holder to specific times or dates. Mechanical locks and keys do not provide records of the key used on any specific door, and the keys can be easily copied or transferred to an unauthorized person. When a mechanical key is lost or the key holder is no longer authorized to use the protected area, the locks must be re-keyed.[citation needed] Electronic access control uses computers to solve the limitations of mechanical locks and keys. A wide range of credentials can be used to replace mechanical keys. The electronic access control system grants access based on the credential presented. When access is granted, the door is unlocked for a predetermined time and the transaction is recorded. When access is refused, the door remains locked and the attempted access is recorded. The system will also monitor the door and alarm if the door is forced open or held open too long after being unlocked
  • Credential
  • Access control system operation
  • The above description illustrates a single factor transaction. Credentials can be passed around, thus subverting the access control list. For example, Alice has access rights to the server room, but Bob does not. Alice either gives Bob her credential, or Bob takes it; he now has access to the server room. To prevent this, two-factor authentication can be used. In a two factor transaction, the presented credential and a second factor are needed for access to be granted; another factor can be a PIN, a second credential, operator intervention, or a biometric input
  • There are three types (factors) of authenticating information:[2] something the user knows, e.g. a password, pass-phrase or PIN something the user has, such as smart card or a key fob something the user is, such as fingerprint, verified by biometric measurement
  • Passwords are a common means of verifying a user's identity before access is given to information systems. In addition, a fourth factor of authentication is now recognized: someone you know, whereby another person who knows you can provide a human element of authentication in situations where systems have been set up to allow for such scenarios
  • When a credential is presented to a reader, the reader sends the credential’s information, usually a number, to a control panel, a highly reliable processor. The control panel compares the credential's number to an access control list, grants or denies the presented request, and sends a transaction log to a database. When access is denied based on the access control list, the door remains locked.
  • A credential is a physical/tangible object, a piece of knowledge, or a facet of a person's physical being, that enables an individual access to a given physical facility or computer-based information system. Typically, credentials can be something a person knows (such as a number or PIN), something they have (such as an access badge), something they are (such as a biometric feature) or some combination of these items. This is known as multi-factor authentication. The typical credential is an access card or key-fob, and newer software can also turn users' smartphones into access devices.
  • An access control point, which can be a door, turnstile, parking gate, elevator, or other physical barrier, where granting access can be electronically controlled. Typically, the access point is a door. An electronic access control door can contain several elements. At its most basic, there is a stand-alone electric lock. The lock is unlocked by an operator with a switch. To automate this, operator intervention is replaced by a reader. The reader could be a keypad where a code is entered, it could be a card reader, or it could be a biometric reader. Readers do not usually make an access decision, but send a card number to an access control panel that verifies the number against an access list
  • monitor the door position
  • Generally only entry is controlled, and exit is uncontrolled. In cases where exit is also controlled, a second reader is used on the opposite side of the door. In cases where exit is not controlled, free exit, a device called a request-to-exit (REX) is used. Request-to-exit devices can be a push-button or a motion detector. When the button is pushed, or the motion detector detects motion at the door, the door alarm is temporarily ignored while the door is opened. Exiting a door without having to electrically unlock the door is called mechanical free egress. This is an important safety feature. In cases where the lock must be electrically unlocked on exit, the request-to-exit device also unlocks the doo
  • Access control topology
  • Access control decisions are made by comparing the credential to an access control list. This look-up can be done by a host or server, by an access control panel, or by a reader. The development of access control systems has seen a steady push of the look-up out from a central host to the edge of the system, or the reader. The predominant topology circa 2009 is hub and spoke with a control panel as the hub, and the readers as the spokes. The look-up and control functions are by the control panel. The spokes communicate through a serial connection; usually RS-485. Some manufactures are pushing the decision making to the edge by placing a controller at the door. The controllers are IP enabled, and connect to a host and database using standard networks
  • Access control readers may be classified by the functions they are able to perform
  • and forward it to a control panel.
  • Basic (non-intelligent) readers: simply read
  • Semi-intelligent readers: have all inputs and outputs necessary to control door hardware (lock, door contact, exit button), but do not make any access decisions. When a user presents a card or enters a PIN, the reader sends information to the main controller, and waits for its response. If the connection to the main controller is interrupted, such readers stop working, or function in a degraded mode. Usually semi-intelligent readers are connected to a control panel via an RS-485 bus.
  • Intelligent readers: have all inputs and outputs necessary to control door hardware; they also have memory and processing power necessary to make access decisions independently. Like semi-intelligent readers, they are connected to a control panel via an RS-485 bus. The control panel sends configuration updates, and retrieves events from the readers.
  • Systems with IP readers usually do not have traditional control panels, and readers communicate directly to a PC that acts as a host
  • a built in webservice to make it user friendly
  • Some readers may have additional features such as an LCD and function buttons for data collection purposes (i.e. clock-in/clock-out events for attendance reports), camera/speaker/microphone for intercom, and smart card read/write support
Kurt Laitner

The Link Economy and Creditright - Geeks Bearing Gifts - Medium - 3 views

medium.com/...y-and-creditright-95f938b503be

contributory value accounting dimVal *jeffjarvis creditright

shared by Kurt Laitner on 07 May 15 - No Cached
  • Online, content with no links has no value because it has no audience
  • News Commons used Repost as the basis of a content- and audience-sharing network among dozens of sites big and small in the state’s new ecosystem
  • Huffington Post and Twitter can get thousands of writers — including me — to make content for free because it brings us audience and attention.
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  • Consider an alternative to syndication. I’ll call it reverse syndication. Instead of selling my content to you, what say I give it to you for free? Better yet, I pay you to publish it on your site. The condition: I get to put my ad on the content. I will pay you a share of what I earn from that ad based on how much audience you bring me.
  • That model values the creation of the audience
  • If content could travel with its business model attached, we could set it free to travel across the web, gathering recommendations and audience and value as it goes
  • She searched Google for “embeddable article” and up came Repost.us, already created by entrepreneur and technologist John Pettitt. Repost very cleverly allowed embeddable articles to travel with the creator’s own brand, advertising, analytics, and links.
  • First, he found that the overlap in audience between a creator’s and an embedder’s sites generally ran between 2 and 5 percent. That is to say, the embedders brought a mostly new audience to the creator’s content.
  • Instead, Pettitt found that click-through ran amazingly high: 5 to 7 percent — and these were highly qualified clicks of people who knew what they were going to get on the other side of a link
  • I call this creditright. We need a means to attach credit to content for those who contribute value to it so that each constituent has the opportunity to negotiate and extract value along the chain, so that each can gain permission to take part in the chain, and so that behaviors that benefit others in the chain can be rewarded and encouraged
    • Kurt Laitner
      Kurt Laitner on 07 May 15
       
      so *net basically, or OVN contributory value accounting
  • Each creator’s ads traveled with its content — though that wasn’t necessarily optimal, because an ad for a North Jersey hairdresser wouldn’t perform terribly well with South Jersey readers brought in through embedding.
  • key factor in its failure: Repost could find many sites willing and eager to make their content embeddable. It didn’t find enough sites to embed the content.
  • But the embedders got nothing aside from the free use of content — content that was just a link away anyway
  • Our ultimate problem in media is that we do not have sufficient technical and legal frameworks for alternate business models.
  • That formula was the key insight behind Google: that links to content are a signal of its value; thus, the more links to a page from sites that themselves have more links, the more useful, relevant, or valuable that content is likely to be
  • Silicon Valley’s: Those people are your fans who are bringing value to you by sending you audiences and by contributing their creativity, and you’d be wise to build your businesses around making it easier, not harder, for them to get and share your content when and how they want it.
  • And so, we came to agree that we need new technological and legal frameworks flexible enough to enable multiple models to support creativity.
  • Hollywood’s side: People who download our content without buying it or who remix it without our permission — and the platforms that facilitate these behaviors — are stealing from us and must be stopped and punished.
  • Imagine you are a songwriter. You hear a street poet and her words inspire you to write a song about her, quoting her in the piece. You go to a crowdfunding platform — Kickstarter, Indiegogo, or Patreon — to raise money for you to go into the studio and perform and distribute your song. Another songwriter comes along and remixes it, making a new version and also sampling from others’ songs. Both end up on YouTube and Soundcloud, on iTunes and Google Play. Audience members discover and share the songs. A particularly popular artist shares the remixed version on Twitter and Facebook and it explodes. A label has one of its stars record it. The star appears on TV performing it. A movie studio includes that song in a soundtrack. There are many constituents in that process: the subject, the songwriter, the patrons, the fans, the remixer, the distributor, the label, the star, the show, the studio, and the platforms. Each contributed value.
  • Each may want to recognize value — but not all will want cash. There are other currencies in play: The poet may want credit and fame; the songwriter may want to sell concert tickets; the patrons may want social capital for discovering and supporting a new artist; the remixer may want permission to remix; the platforms may want a cut of sales or of subscription revenue; the show may want audience and advertising; the studio will want a return on its investment and risk.
  • I’ve suggested they would be wiser to seek another currency from Google: data about the users, helping build better services for readers and advertisers and thus better businesses
  • We will need a way to attach metadata to content, recording and revealing its source and the contributions of others in the chain of continuing creation and distribution.
  • We need a marketplace to measure and value their contributions and a means to negotiate rewards and permissions
  • We need payment structures to handle multiple currencies: data as well as money
  • And we need a legal framework to allow the flexible exploration of new models, some of which we cannot yet imagine.
  • It took many more years for society to develop principles of free speech to balance the economic and political interests of those who would attempt to control a new tool of speech.
  • We must reimagine the business of media and news from the first penny, asking where value is created, who contributes to it, where it resides, and how to extract it
  • Thus, we need new measures of value
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