# sudo

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 Oct17 awarded Yearling Sep10 comment How can I map arbitrary group elements to unique integers without using Hash functions? So, verification of a signature should just consist in trying all public keys, correct? Sep10 comment How can I map arbitrary group elements to unique integers without using Hash functions? I'm not particularly knowledgeable about ring signatures, but couldn't you just release all public keys without disclosing which belongs to whom? Sep10 comment How can I map arbitrary group elements to unique integers without using Hash functions? Sorry, but I remain confused. 1. Why are you keeping the public key secret? 2. What does the third party know? What exactly is it supposed to be able to verify? Sep9 comment How can I map arbitrary group elements to unique integers without using Hash functions? Note that finding $\varphi^{-1}$ might be infeasible in some cases. It would help to know which group you're trying to map to $\mathbb Z_p$. Sep9 answered How can I map arbitrary group elements to unique integers without using Hash functions? Mar5 awarded Disciplined Feb24 comment Difference between Rijndael 128 / 256 blocksize implementations? (and impact of block size in general) @figlesquidge: Uppercase B means bytes, not bits. Jan5 comment Deterministically combine more than one source of entropy I'm not sure I know what you mean. Are you talking about deriving an integer from a pseudo-randomly generated floating point number or about the uniform distribution of the exclusive OR? Jan5 answered Deterministically combine more than one source of entropy Jan5 comment Deterministically combine more than one source of entropy The sum of r1 and r2 will have an Irwin–Hall distribution, which is not at all uniform. Dec30 comment Why xor is a linear operation but ordinary adding is not γ1 and γ2 can be any scalar, i.e, any element of the field F. In the example of the 8-bit integers, the only scalars are 0 and 1, yes. But in general, F could be any field, e.g., the set of all rational, real or complex numbers. Dec30 revised Why xor is a linear operation but ordinary adding is not added 7 characters in body Dec28 revised Why xor is a linear operation but ordinary adding is not deleted 171 characters in body Dec28 comment Why xor is a linear operation but ordinary adding is not Right, scalar multiplication isn't distributive over field addition. Dec28 answered Why xor is a linear operation but ordinary adding is not Dec27 reviewed Excellent Why is sharing the seed and using SecureRandom “deterministically” so bad? Dec27 comment Using HMAC to secure a “widget” HTTPS encrypts the GET request as well, not just the headers. Dec25 awarded Custodian Dec25 reviewed Satisfactory Hypothetical unknown cipher - security in obscurity?