What? Is the IV public? It usually is and making the seed you use for your RNG public is a _horrible_ idea! You shouldn't use the same IV/Key twice in any case, especially for streamciphers since an attacker could recover the keystream for every bit of known plaintext! So just generate a new truly random KEY/IV pair.
Vikas patial wrote: > hmm no replies ... > > For now im using Sosemanuk as a rng for my RSA key pair generation. I > pass the seed to the iv and the key of the stream cipher. > > Is that secure enough ? > > On Aug 3, 1:24 pm, Vikas patial <[email protected]> wrote: > >> LC_RNG gives the results i want , but it is not recommended for crypto >> graphic purposes. >> >> Any way i can pass a long string/seed to have a deterministic output >> from a RNG. >> >> On Aug 2, 12:59 pm, Vikas patial <[email protected]> wrote: >> >> >>> No i dont want fixed pairs always. The seed is generated using a >>> password which user supplies. So that user can regenerated the pair >>> when required. >>> >>> My old code was working fine for RSA/DH , but somehow new version when >>> compiled its not working for keysize > 127 Bits. >>> >>> Also i am of the opinion my old method was not good enough , so am >>> seeking help. >>> >>> On Aug 2, 10:26 am, "Elias Önal" <[email protected]> wrote: >>> >>>> If you always want the same keypair, why generate it in the first place? >>>> Just hardcode it! >>>> Besides - This code works for me, it is EC and not RSA/DH, but it has >>>> the around the same safety using 256bit keys. >>>> >>>> http://pastebin.com/RJF3NAYe >>>> >>>> Though I guess changing the parameters to the DH/RSA ones schould work >>>> as well, in general crypto++ is pretty straight forward. >>>> >>>> Vikas patial wrote: >>>> >>>>> I need to generate a public private keypair of atleast 2048 bit for >>>>> some operations in my software. >>>>> >>>>> I was doing this earlier using Fixedrng but it does not seem to work >>>>> now ( somehow it hangs ), Also using seeded RandPool does not work >>>>> maybe im doing something wrong. >>>>> >>>>> So if anyone can help me generate a fixed keypair based on a seed it >>>>> would be great . Basically same keypair is generated everytime for the >>>>> same seed. >>>>> >>>>> I am using the code formhttp://www.cryptopp.com/wiki/RSAandsaving >>>>> it to files. >>>>> >>>>> The first person who sorts this out for me i would offer 30 USD >>>>> ( Paypal ) . >>>>> >> > > -- You received this message because you are subscribed to the "Crypto++ Users" Google Group. To unsubscribe, send an email to [email protected]. More information about Crypto++ and this group is available at http://www.cryptopp.com.
