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To generate a valid pairwise master key for a WPA2 network a router uses the PBKDF2-HMAC-SHA1 algorithm. I understand that the sha1 function is performed 4096 times to derive the PMK, however I have two questions about the process.
Excuse the pseudo code.
1) How is the input to the first instance…
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Given two different strings S1 and S2 (S1 != S2) is it possible that:
SHA1(S1) == SHA1(S2)
is True?
If yes - with what probability? Is there a upper bound on the length of a string, for which probably of getting duplicates is 0?
If not - why not?
Thanks
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My problem is a bit hairy, and I may be asking the wrong questions, so please bear with me...
I have a legacy MySQL database which stores the user passwords & salts for a membership system. Both of these values have been hashed using the Ruby framework - roughly like this:
hashedsalt =
…
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It is known that
1. if ( md5(a) == md5(b) )
2. then ( md5(a.z) == md5(b.z) )
3. but ( md5(z.a) != md5(z.b) )
where the dots concatenate the strings.
What happens in the second row if we change all the md5 to sha1? So:
1. if ( sha1(c) == sha1(d) )
2. then ( sha1(c.z)…
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hi all,
i want to generate HMAC-SHA1 of NSString type variable. I see the post but this method give me error in CCHmac(kCCHmacAlgSHA256, cKey, strlen(cKey), cData, strlen(cData), cHMAC);
and
NSString *hash = [HMAC base64Encoding];
line.
Please suggest how can I generate the HMAC-SHA1 of any string…
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