Croc is a free and open-sourcecommand line tool that allows any two computers to simply and securely transfer files and folders using code phrases.
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Table of contents
- How to Install Croc Secure File Transfer App on Linux
- How to Securely Transfer Files Between Computers Using Croc
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There are lots of ways to transfer files between two or more computers. Today, we will discuss about yet another utility named Croc. This tutorial we’ll show you how to install Croc and how to use it to securely transfer files between computers.
Croc is a file transfer system that sends files securely using end-to-end encryption, via a file transfer relay. If you are curious about the name, it is inspired by the fable of the frog and the crocodile. The Croc key advantages are speed, security, and simplicity, all-in-one. Transferring data using Croc is faster, because it acts as a relay server between the systems. It creates a full-duplex real-time communication layer between the two computers, so the “uploading” and “downloading” tasks occur simultaneously between those computers.
Croc is a cross-platform tool. It is written in GO programming language and freely available under MIT license. You can install it on Linux, Mac, Windows, and Android, and securely transfer files between them. Croc does not only work in same LAN but on any two computers connected to the internet.
How to Install Croc Secure File Transfer App on Linux
Ubuntu / Debian
Download the latest release (.deb package) from the project website. Then you can install it by running apt install followed by the full path to the downloaded file:
Arch Linux
Others
The command shown bellow will install croc in /usr/local/bin/ location.
How to Securely Transfer Files Between Computers Using Croc
Using the croc command to send a file or folder from your computer to any other computer is as simple as it can get. Of course, croc needs to be installed on both computers, the one that’s sending the file(s) and the one receiving them.
To transfer a file/folder using croc, simply run:
Example:
Croc will generate random code phrase like above. Here, the code phrase is 1846-jump-mega-clean. The code phrase is used to establish password-authenticated key agreement (PAKE) which generates a secret key for the sender and recipient to use for end-to-end encryption. This ensures secure file transfers.
On the second computer (receiver), to receive the file or folder all you have to do is type croc <passphrase> (in this case it’s croc 1846-jump-mega-clean). Running this command will establish the connection with the sender, secure the channel and will ask you if you want to download whatever is being sent.
Once you accept the transfer the download will begin and you will see the progress in your terminal emulator. Same thing goes for the sender. If you check the terminal on machine that’s sending the file, you will be able to see the transfer progress.
Set Custom Croc’s Code Phrase
You can also securely transfer files or folders with a custom code of your choice using --code option.
The recipient can receive the file using the following command:
Send Text
You can also use croc to send text. This can be useful when you want securely to share a message or URL. To do that all you have to do is type:
Croc Torrent
The recipient can receive the text using the following command:
Use Croc with Your Own Relay Server to Securely Transfer Files
Now, baked into Croc’s configuration is the use of a public relay server that Croc’s creator has set up, but one can set up their own relay server, and configure croc to use that relay server at runtime. To do this requires a one-time setup on a third computer or in a docker container.
Run croc as a relay process on a server with a public address, for example 25.69.4.216:
Then, we point croc away from the default public relay when sending a file:
Then on the receiving end:
Closing thoughts
In a nutshell, Croc does the following:
- Securely transfer files, folders, and text between two computers using a relay
- Provides end-to-end encryption using PAKE library
- Transfers multiple files in one go
- Resumes interrupted file copying
- No central server port-forwarding needed
- Requires Zero dependencies
- Cross platform
- Free and open source
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Croc is definitely a tool that you need to check out if you are looking for a secure file transfer solution. There’s a lot more you can do with it and we encourage you to read the author’s blog post about the tool.
If you've played the first one, you'll be sad to hear that Baron Dante didn't learn his lesson the first time he was trounced. Now he's gone and kidnapped the Gobbo kings, and somehow or another Croc's parents are involved. So, no plot then, but it's a good excuse to dive into more than 40 levels of 3D platform action.
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The Croc 2 world is composed of huge areas devoted to four tribes of Gobbos, where the aim of the game is to nab powerups, whack enemies and overcome reflex-intensive challenges to save the day.Movements are your bog standard run, jump, climb, swim and swing on monkey bars. You can also push objects, pick them up and toss them about. Venture far enough and you'll get to make use of mine carts, hot air balloons, speedboats, and hang gliders.
Unfortunately, despite a lovely visual makeover, Croc 2 suffers from horrendous camera positioning and simple jumps are made unbearably difficult. Even so, this isn't a bad game by any stretch of the imagination, just one that's overly challenging due to execution, not intentional design.