code: function (password, plaintext, params, rp) {
      var j = sjcl.json, p = j._encrypt.apply(j, arguments);
      return j.encode(p);
    }
docs: Simple encryption function.
  @param {String|bitArray} password The password or key.
  @param {String} plaintext The data to encrypt.
  @param {Object} [params] The parameters including tag, iv and salt.
  @param {Object} [rp] A returned version with filled-in parameters.
  @return {String} The ciphertext serialized data.
  @throws {sjcl.exception.invalid} if a parameter is invalid.