How barcode or QR-code is resistant to change stored data?

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Assume we want to protect a document against manipulating and forging. So, we encode some sensitive information of the document and store it in a QR-code inserted in the document.



Can we be sure that an attacker is not able to change and modify the stored data in the QR-code? And if it is possible to modify it, how is it difficult for an attacker to do it? In other words, how a QR-code is secure?






physical qr-code barcode







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    up vote
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    down vote

    favorite












    Assume we want to protect a document against manipulating and forging. So, we encode some sensitive information of the document and store it in a QR-code inserted in the document.



    Can we be sure that an attacker is not able to change and modify the stored data in the QR-code? And if it is possible to modify it, how is it difficult for an attacker to do it? In other words, how a QR-code is secure?






    physical qr-code barcode







    share|improve this question







    New contributor




    sas is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.





















      up vote
      1
      down vote

      favorite









      up vote
      1
      down vote

      favorite











      Assume we want to protect a document against manipulating and forging. So, we encode some sensitive information of the document and store it in a QR-code inserted in the document.



      Can we be sure that an attacker is not able to change and modify the stored data in the QR-code? And if it is possible to modify it, how is it difficult for an attacker to do it? In other words, how a QR-code is secure?






      physical qr-code barcode







      share|improve this question







      New contributor




      sas is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      Assume we want to protect a document against manipulating and forging. So, we encode some sensitive information of the document and store it in a QR-code inserted in the document.



      Can we be sure that an attacker is not able to change and modify the stored data in the QR-code? And if it is possible to modify it, how is it difficult for an attacker to do it? In other words, how a QR-code is secure?






      physical qr-code barcode




      physical qr-code barcode






      share|improve this question







      New contributor




      sas is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      share|improve this question







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          ... how a QR-code is secure?




          Data in a QR code are kind of protected against accidental damage by having some error correction but they are not protected against deliberate manipulation. Also, an attacker might completely replace the QR code in the document with a different one.






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            1 Answer
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            oldest

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            active

            oldest

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            up vote
            3
            down vote



            accepted











            ... how a QR-code is secure?




            Data in a QR code are kind of protected against accidental damage by having some error correction but they are not protected against deliberate manipulation. Also, an attacker might completely replace the QR code in the document with a different one.






            share|improve this answer
























              up vote
              3
              down vote



              accepted











              ... how a QR-code is secure?




              Data in a QR code are kind of protected against accidental damage by having some error correction but they are not protected against deliberate manipulation. Also, an attacker might completely replace the QR code in the document with a different one.






              share|improve this answer






















                up vote
                3
                down vote



                accepted







                up vote
                3
                down vote



                accepted







                ... how a QR-code is secure?




                Data in a QR code are kind of protected against accidental damage by having some error correction but they are not protected against deliberate manipulation. Also, an attacker might completely replace the QR code in the document with a different one.






                share|improve this answer













                ... how a QR-code is secure?




                Data in a QR code are kind of protected against accidental damage by having some error correction but they are not protected against deliberate manipulation. Also, an attacker might completely replace the QR code in the document with a different one.







                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered 4 hours ago









                Steffen Ullrich

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