A friend of mine introduced me to transfer.sh more than a year ago. transfer.sh is a simple and free file transfer service that plays along with Linux very well.

Here's some notes on how I use it:

For this example, we'll download the Mozilla Firefox Source code. Then we'll encrypt it and upload it to transfer.sh to demonstrate it's usage.

1. Download the firefox source code:

cd /tmp
curl -LO https://archive.mozilla.org/pub/firefox/releases/54.0/source/firefox-54.0.source.tar.xz

2. Set a variable for the file you want to encrypt:

file=/tmp/firefox-54.0.source.tar.xz

3. Set another variable with the password you're going to use - in this example I'm creating a random 16 character-long password using OpenSSL:

password=`openssl rand -hex 16`

4. Encrypt the file using OpenSSL:

openssl aes-256-cbc -a -salt -in $file -out $file.enc -k $password

5. Upload to transfer.sh and store the result in the $upload variable

# Note that by using the `"Max-Days: 1"` header, the file will live in transfer.sh only for one day. 
upload=`curl -H "Max-Days: 1" --upload-file $file.enc https://transfer.sh`

6. Print out the upload url and the password:

printf "url=$upload\npassword=$password\n"

Example output:

url=https://transfer.sh/iX4rT/firefox-54.0.source.tar.xz.enc
password=ee0ebdbe9a78da56ceab98d0a7615739

7. Or optionally, store them for later:

printf "url=$upload\npassword=$password\n" >> ~/uploaded-stuff.txt

To download the file:

1. Set a variable with your URL and one with your password (if not already set):

url=https://transfer.sh/iX4rT/firefox-54.0.source.tar.xz.enc
password=ee0ebdbe9a78da56ceab98d0a7615739

2. Download and decrypt:

cd /tmp
curl -LO $url
openssl aes-256-cbc -d -a -in `basename "$url"` -out `basename --suffix=".enc" "$url"` -k $password

Done!

Alternatively: Hate OpenSSL with a passion ? Use ccrypt:

1. Install the EPEL repository and use that to install ccrypt:

yum -y install epel-release && yum -y install ccrypt

2. Encrypt your file using ccrypt:

ccencrypt -K superpassword firefox-54.0.source.tar.xz

3. Decrypt it:

ccdecrypt -K superpassword firefox-54.0.source.tar.xz.cpt

Sources: