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PKCS#1 is the first standard published by RSA Security, which was setup by the inventors of RSA, Rivest, Shamir and Adleman. It describes how the RSA problem can be used to perform secure signature generation and encryption.

4 votes
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conflicting definitions for dP / dQ and exponent1 / exponent2 in PKCS 1?

The formulas are equivalent. From §3.2: $e \cdot d \equiv 1 \pmod{\lambda(n)}$, i.e. $e \cdot d - 1 \equiv 0 \pmod{\lambda(n)}$, i.e. $\lambda(n)$ divides $e \cdot d - 1$. From §3.1: $\lambda(n) = \ma …
Gilles 'SO- stop being evil''s user avatar
3 votes
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Differences between two RSA signatures using OpenSSL

There are several ways to build a signature scheme on top of RSA. The two main schemes are PKCS#1v1.5 (named after the version of the document called PKCS#1 that codified it) and PSS (also codified in …
Gilles 'SO- stop being evil''s user avatar