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## Describe the bug
Repeated instances of "cannot secure channel", but sender and receiver are on latest (v10). Ubuntu <-> Mac
The ubuntu version requires an export of a variable, which is used as the pass code on send commands (assuming this is intended behaviour). Mac version of send generated a random pass phrase (typical past behaviour). 

## To Reproduce
Steps to reproduce the behavior:

1. Install v10 on both machines
2. Send a file either way `croc send Z.tar.gz`
3. Prompt to generate export secret `export CROC_SECRET="xxx"` 
4. `On the other computer run croc xxx`
5. Run `croc xxx` on reciever machine
6. `securing channel...2024/05/23 15:33:24 could not secure channel` 

## Expected behaviour
Croc to generate a random pass phrase without need for the CROC_SECRET variable to be set. File to send without secure channel issues


## Version
`croc version v10.0.0`


## Additional context
Thanks for the great tool! First time I've had this issue, ran the latest tool for a long time without issues, this is the first problem.
V10 can't secure channel error
This is a GitHub Issue
repo:croc
owner:schollz
Title : V10 can't secure channel error
Issue date:

--- start body ---
<!-- The comments between these brackets won't show up in the submitted issue (as you can see in the Preview). -->


<!-- Please try to download latest, https://github.com/schollz/croc/releases/latest of croc before reporting a bug! -->

## Describe the bug
Repeated instances of "cannot secure channel", but sender and receiver are on latest (v10). Ubuntu <-> Mac
The ubuntu version requires an export of a variable, which is used as the pass code on send commands (assuming this is intended behaviour). Mac version of send generated a random pass phrase (typical past behaviour). 

## To Reproduce
Steps to reproduce the behavior:

1. Install v10 on both machines
2. Send a file either way `croc send Z.tar.gz`
3. Prompt to generate export secret `export CROC_SECRET="xxx"` 
4. `On the other computer run croc xxx`
5. Run `croc xxx` on reciever machine
6. `securing channel...2024/05/23 15:33:24 could not secure channel` 

## Expected behaviour
Croc to generate a random pass phrase without need for the CROC_SECRET variable to be set. File to send without secure channel issues


## Version
`croc version v10.0.0`


## Additional context
Thanks for the great tool! First time I've had this issue, ran the latest tool for a long time without issues, this is the first problem.
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