Conventions used

There are a number of text conventions used throughout this book.

Code in text: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: " We use the decipher object, just like we did with the cipher object in the previous method, invoking decipher.update with the ciphertext to decrypt and use decipher.final when we're done."

A block of code is set as follows:

const crypto = require('crypto')
const fs = require('fs')
const util = require('util')
const readFile = util.promisify(fs.readFile)

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

    const bobPublicKeyPem = bobKeyPair.publicKey.export(
        {type: 'spki', format: 'pem'}
    )
    const aliceSharedSecret = crypto.diffieHellman({
        publicKey: crypto.createPublicKey(bobPublicKeyPem),
        privateKey: aliceKeyPair.privateKey
    })

Any command-line input or output is written as follows:

$ openssl genrsa -out private.pem 4096

Bold: Indicates a new term, an important word, or words that you see onscreen. For instance, words in menus or dialog boxes appear in bold. Here is an example: "Select System info from the Administration panel."

Tips or Important Notes

Appear like this.