"Got a hot tip about federal waste, fraud or corruption? You should think twice about using the government's own online systems for collecting such complaints. Many of them promise confidentiality but for years have sent sensitive data - including names, addresses and phone numbers of whistleblowers, as well as the details of their allegations - across the Internet in a way that could be intercepted by hackers or snoops. Or, perhaps worse still, by the agencies named in the complaints".
Keith's note: No mention of encryption at the NASA IG website - or with the hotline - note that the URL is NOT https://oig.nasa.gov/cyberhotline.html