Compress and encrypt the file. To decrypt, see decrypt.js

decrypt.js

fs.createReadStream(file)
  .pipe(crypto.createDecipher('aes192', 'a_secret'))
  .pipe(zlib.createGunzip())
  .pipe(reportProgress)
  .pipe(fs.createWriteStream(file.slice(0, -3)))
  .on('finish', () => console.log('Done'));

encrypt.js

const crypto = require('crypto');
fs.createReadStream(file)
  .pipe(zlib.createGzip())
  .pipe(crypto.createCipher('aes192', 'a_secret'))
  .pipe(reportProgress)
  .pipe(fs.createWriteStream(file + '.zz'))
  .on('finish', () => console.log('Done'));