Checkra1n Jailbreak
checkra.in
checkra.in
In the case of the security of both your iDevice and this software, it is considered dangerous if it is not an open-source jailbreak and it is the equivalent to running malware on your device.
The same was done in days of the TaiG Jailbreak which included spyware upon installation [0]. Until the Checkra1n team make a public open-source release, for the time being this jailbreak still poses a security risk to your iDevice.
All I can say is use this at your own risk.
[0] https://9to5mac.com/2013/12/22/ios-7-jailbreak-installs-pira...