Install REOP from Source
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$ mkdir -p ~/src
$ cd ~/src 
$ endget --no-check-certificate https://www.tedunangst.com/flak/files/reop-3.0-snapshot.tar.gz
$ tar -xvf reop-3.0-snapshot.tar.gz 
$ cd reop 
$ ./configure 
$ make 
$ ./reop --help 
$ cd ~/bin 
$ ln -s ~/src/reop/reop reop 
$ export PATH=$HOME/bin:$PATH
$ reop --help

Generate a key pair
$ cd ~ 
$ mkdir -p crypto 
$ cd crypto 
$ mkdir -p reop 
$ cd reop 
$ pwd 
~/crypto/reop 
$ reop -G -i endwall
Enter a passphrase:

$ ls ~/.reop
pubkey seckey

Encrypt / Decrypt
$ cd ~/crypto/reop
$ echo "This is the message" >> message
$ reop -E -i endwall -p ~/.reop/pubkey -m message 
passphrase: 
$ ls 
message message.enc 
$ reop -D -p ~/.reop/pubkey -m decrypt -x message.enc 
passphrase: 
$ ls 
message message.enc decrypt
$ cat message
$ cat message.enc
$ cat decrypt

Useful for encrypting passwords.txt file on an air gap for passwords generated using passgen

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