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I am working on a Golang code similar to Signal protocol. I need to modify it. I am confused on tripartite Diffie-Hellman handshake part of code, i.e. why public key has two separate parts as compared to private key which has only one part in bytes as shown below. I can more info if needed. Thanks.

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    $\begingroup$ Start with a primer on elliptic curve cryptography? $\endgroup$ – Squeamish Ossifrage Mar 24 at 22:24
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    $\begingroup$ And consider using Noise if you need to design a new protocol? $\endgroup$ – Squeamish Ossifrage Mar 24 at 22:24
  • $\begingroup$ Thanks a lot. A lecture on cryptography made me understood it. $\endgroup$ – Tahir Abbas Mar 24 at 23:20
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The answer to this question is simple. In simple words, in elliptic curve cryptography, the public key is calculated by multiplying the private key value $s$ with the base point $G$, which results a point on the elliptic curve point: $W = s \cdot G$. This point consists of has two values on the x-axis and one on y-axis if the curve is considered to be within a 2D coordinate system.

Here is a link which gives a good idea of it: ECC with Diffie-Hellman.

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