oneshar.es is described as 'Sending confidential information such as passwords, account information and other sensitive data in emails and IM is not necessarily safe. That data is typically stored with remnants of the bits in places you don't need it to be' and is an app in the security & privacy category. There are seven alternatives to oneshar.es for a variety of platforms, including Windows, Linux, Web-based, Mac and Android apps. The best oneshar.es alternative is Temp.PM, which is free. Other great apps like oneshar.es are Lockbin, secserv.me, Sendinc and SFLetter.
Seems to do the same job. Unfortunately oneshar.es don't seem to have updated their SSL certificate to current standards.