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<a href="https://gitlab.com/phlerovium">Brian Henry</a>
<a href="https://gitlab.com/gnutls/gnutls/-/issues/1231#note_575041260">commented</a>:
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<p dir="auto">"security levels" is different to "key size(key length)"</p>
<p dir="auto">I found some <a href="https://cryptobook.nakov.com/asymmetric-key-ciphers/elliptic-curve-cryptography-ecc" rel="nofollow noreferrer noopener" target="_blank">explanation</a>:</p>
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<p>The Curve448 provides ~ 224-bit security level (more precisely <a href="https://safecurves.cr.yp.to/rho.html" rel="nofollow noreferrer noopener" target="_blank">222.8-bits</a>). The private keys for the Curve448 are 446 bits and are typically encoded as 448-bit integers (56 bytes, 112 hex digits). The public keys are also encoded as 448-bit integers.</p>
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