Does ChaCha20-Poly1305 need random nonce?

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RFC 7539 says:




A 96-bit nonce -- different for each invocation with the same key




It doesn't explicitly say whether it has to be random or not. If we use an ever incrementing counter. Would that be secured? Generating cryptographically secured random number is a slow process.










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    5












    $begingroup$


    RFC 7539 says:




    A 96-bit nonce -- different for each invocation with the same key




    It doesn't explicitly say whether it has to be random or not. If we use an ever incrementing counter. Would that be secured? Generating cryptographically secured random number is a slow process.










    share|improve this question











    $endgroup$














      5












      5








      5





      $begingroup$


      RFC 7539 says:




      A 96-bit nonce -- different for each invocation with the same key




      It doesn't explicitly say whether it has to be random or not. If we use an ever incrementing counter. Would that be secured? Generating cryptographically secured random number is a slow process.










      share|improve this question











      $endgroup$




      RFC 7539 says:




      A 96-bit nonce -- different for each invocation with the same key




      It doesn't explicitly say whether it has to be random or not. If we use an ever incrementing counter. Would that be secured? Generating cryptographically secured random number is a slow process.







      pseudo-random-generator nonce chacha poly1305






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      edited Jan 26 at 17:13







      Saptarshi Basu

















      asked Jan 26 at 17:09









      Saptarshi BasuSaptarshi Basu

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          No, it doesn't need a random nonce. Yes, if you use an incrementing counter, that works.



          As the RFC says, the only requirement is uniqueness; as long as you make sure that each nonce you use is different, you have met the requirements - an incrementing counter does that quite nicely (and, in fact, is commonly used in practice)






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            $begingroup$

            No, it doesn't need a random nonce. Yes, if you use an incrementing counter, that works.



            As the RFC says, the only requirement is uniqueness; as long as you make sure that each nonce you use is different, you have met the requirements - an incrementing counter does that quite nicely (and, in fact, is commonly used in practice)






            share|improve this answer









            $endgroup$

















              8












              $begingroup$

              No, it doesn't need a random nonce. Yes, if you use an incrementing counter, that works.



              As the RFC says, the only requirement is uniqueness; as long as you make sure that each nonce you use is different, you have met the requirements - an incrementing counter does that quite nicely (and, in fact, is commonly used in practice)






              share|improve this answer









              $endgroup$















                8












                8








                8





                $begingroup$

                No, it doesn't need a random nonce. Yes, if you use an incrementing counter, that works.



                As the RFC says, the only requirement is uniqueness; as long as you make sure that each nonce you use is different, you have met the requirements - an incrementing counter does that quite nicely (and, in fact, is commonly used in practice)






                share|improve this answer









                $endgroup$



                No, it doesn't need a random nonce. Yes, if you use an incrementing counter, that works.



                As the RFC says, the only requirement is uniqueness; as long as you make sure that each nonce you use is different, you have met the requirements - an incrementing counter does that quite nicely (and, in fact, is commonly used in practice)







                share|improve this answer












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                share|improve this answer










                answered Jan 26 at 17:12









                ponchoponcho

                92k2145238




                92k2145238



























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