Veröffentlicht: 26.01.2018

ECDSA

What is an ECDSA?

ECDSA is an abbreviation that stands for “Elliptic Curve Digital Signature Algorithm”. It is an encryption system that is a variation of the classical Digital Signature Algorithm (DSA).

Elliptic Curve cryptography was developed between 1986 and 1987 by Neal Koblitz and Victor Miller. In the following years, the encryption method was examined and further developed.

In addition, the National Standards Institute has recognized and standardized the Elliptic Curve Digital Algorithm as an encryption method since 1998.

The ECDSA is being increasingly used to encrypt software. Prominent examples of applications include Bitcoin, Windows and smartphones.

How is the ECDSA Defined?

In theory, the ECDSA is a third-degree function, but it cannot be chosen with complete freedom. This restriction exists because certain properties must be guaranteed, which can have a direct influence on safety.

Due to the complexity of encryption, standardized curves are also used. These are defined by various institutions. It is crucial that the size of the key is twice as high as the desired security level in a bit.

Thus, if the security level is to be 100 bits, a key size of 200 bits is required.

Due to these properties, elliptical curves also offer advantages over other encryption methods such as RSA, DAS, or discrete logarithms. The shorter bit length can be 1024 or even 3072 bits. This results in faster algorithms and improves performance.

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