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 Sep 2 awarded Popular Question May 22 awarded Teacher Mar 13 comment Division in paillier cryptosystem yes but like mikeazo pointed out, the answer does not make sense if $b\nmid a$ Mar 13 answered Does RSA work for any message M? Mar 13 accepted Division in paillier cryptosystem Mar 12 asked Division in paillier cryptosystem Mar 9 awarded Scholar Mar 9 accepted Shannon entropy calculation: is $H(A|R·A) = H(A)$? Mar 9 comment Shannon entropy calculation: is $H(A|R·A) = H(A)$? humm, great insight - but excuse my ignorance of abstract algebra. Why exactly is matrix multiplication a group over invertible matrices? Mar 8 awarded Supporter Mar 8 asked Shannon entropy calculation: is $H(A|R·A) = H(A)$? Mar 8 revised Security analysis of a matrix multiplication protocol added 35 characters in body Mar 7 comment Security analysis of a matrix multiplication protocol Yes, i edited the question to read mXm, a secure channel means eve does not hear anything. my question really is how much does Bob know about A, given R*A. Mar 7 awarded Editor Mar 7 revised Security analysis of a matrix multiplication protocol edited mXn to mXm Mar 7 asked Security analysis of a matrix multiplication protocol Mar 7 comment Security analysis of a “one-time pad” type hill cipher humm, yes - but my motivation in asking the question was the following, suppose Alice would like to obtain the product of two matrices AB. She has A and Bob has B. But she dosen't want Bob to know A, so she multiplies A with a random matrix P and sends PA. Bob multiplies B to PA, i.e. PAB and sends it to Alice. Alice inverts P to obtain B i.e. (P^-1)*PA*B. what do you think would be a good way to proceed with the security analysis of this. Mar 4 awarded Student Mar 3 asked Security analysis of a “one-time pad” type hill cipher