Encrypted uploads to 1339.cf.
If ran on a file, it will generate a strong but URL-friendly password, encrypt the file, upload it, and return the URL with the password appended.
If ran on one such password-containing URL, it will download that file and decrypt it, saving to the current directory.
$ ./1339secure diceware8k.txt
Encrypting diceware8k.txt...
Uploading encrypted file...
Upload attempt #0... Uploaded!
File has been encrypted and uploaded to: http://a.1339.cf/gslbrg.txt#j6Vp6_BvPtE5xb7dz9ecBj2C-tzc9WyO
$ ./1339secure http://a.1339.cf/gslbrg.txt#j6Vp6_BvPtE5xb7dz9ecBj2C-tzc9WyO
Downloading and decrypting gslbrg.txt...
File saved to: gslbrg.txt