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It seems like a better solution would be to have the server that is providing the Javascript file, also provide a random seed. The Javascript can then use that random seed (and anything other maybe-random bits it can scrounge up, such as the output from Math.random()) to see a cryptographic PRNG, and then use the output of that crypto-PRNG for generating s, ...


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The multiplier parameter $k$ is different between SRP 6 and 6a. You can see that RFC 5054 calculates it using a hash of the domain parameters (modulus $N$ and generator $g$), so it is using SRP 6a, as opposed to SRP 6 where $k$ is constant. Likewise, in section 6.2.1 of IEC 11770-4 – the October 2005 draft at least – the equivalent value $c$ is defined as a ...


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There is an explicit RCF 5054 which uses SRP to negotiate a shared key for a TLS connection. There are also hooks for OpenSSL to be able to use SRP to setup an SSL connection without using certificates using the SRP generated shared session key.


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Look at where $a$ is used in the protocol: The user calculates the public $A = g^a$ using it. The user computes the session key as $K = H(S)$, with $S = (B - kg^x) ^ {a + ux}$. An attacker should never find out $S$, because even if the session key $K$ leaks due to e.g. a flawed encryption algorithm, she would only know the hashed value. So knowing or ...



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