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Oct
10
comment Using C_Sign to create a PKCS7 signature
Sure. You can use the crypto API, however be sure that you can make these work safely with PKCS#11, because Micro$oft are no famous for their interoperability. You could use the CAPI drivers instead of PKCS#11. Usually the CAPI layer sits over the top of PKCS#11 anyway.
Oct
10
answered Using C_Sign to create a PKCS7 signature
Jan
4
awarded  Teacher
Jan
2
asked How does Clifford Cocks 'Non-Secret Encryption' work?
Dec
29
answered Algorithm: How to use x and y mouse movement co-ordinates to generate random data?
Dec
17
awarded  Student
Dec
17
comment RSA exhibits symmetrical properties — is it possible to form a cryptanalytic attack?
This is because all $C$ values are $mod N$. As $C_s$ is the symmetric partner of $C$ the two added are N. E.G. If $P=11$ and $Q=7$, then $N=77$. If $E=3$ and $M=2$ then $C=8$ ( $2^3 mod 77 = 8$ ). $C_s = (N-M)^e mod N = (77-2)^3 mod 77 = 69$. This means $C + C_s = 8 + 69 = 77$. Also $M_s = N - M = 75$ and therefore $|M_s - C_s| = |M - C| = |75 - 69| = |2 - 8| = 6$.
Dec
17
asked RSA exhibits symmetrical properties — is it possible to form a cryptanalytic attack?