# Tag Info

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What is its signature length ? Depends on what algorithms you use, but with ECDSA the signature length is twice the length of the order of the base point. For P-521 that's 1042 bits, or 132 bytes when using whole bytes for each part. For E-521 it's 1038 bits or 130 bytes. How is it better ? The design criteria for E-521 are stated in A note on ...

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Although the documents referenced so far are interesting in their own right, the actual relevant (as in "giving a legal value to the signatures") ETSI standard here is ETSI TS 119 312. Note also that the venerable 1999/93/EC Directive on electronic signatures is being replaced by the much more ambitious eIDAS regulation. As a regulation, it applies ...

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The European Union did not specify an own digital signature standard. More generally, there are several recommendations which algorithms to use for which setting (as already described in other answers and comments). However, so far the EU left it to the US and especially to NIST to run competitions for new algorithm designs and to standardize them (see the ...

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Except if you are picky with updates of references, there is such standard. DSA, RSA, ECDSA-$F_p$, ECDSA-$F_{2^n}$, are approved by ETSI TS 102 176-1 V2.1.1 (2011-07) (Electronic Signatures and Infrastructures (ESI); Algorithms and Parameters for Secure Electronic Signatures; Part 1: Hash functions and asymmetric algorithms), which essentially ...

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In the document the P-256 parameters describe the curve P-256 on which you want to perform the operations. Traditionally a curve is represented in Weierstrass-form as the set of points for which $$y^2\equiv x^3 + ax+b \pmod p$$ holds. Where $p$ is the prime defining the field for the operation and $a$ and $b$ define the shape of the curve. A point on the ...

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