How to make clonezilla read ecryptfs passphrase from .txt file without ask me to enter it

[bodimo]

When I encrypt my clonezilla saved image, I enter a passphrase, then when I want to restore this image Clonezilla ask me to enter this passphrase. I want to put my ecryptfs passphrase inside file.txt and then instruct clonezilla to get it automatically when it need it without ask me to enter my passphrase. Can anyone please tell me how to do this ?

in fact it is to be sure that our clonezilla backup can only be restored on our 2 PCs because any other PC will not have the .txt file in which we will have put the passphrase

[Steven Shiau]

Actually Clonezilla live use ecryptfs to encrypt the image dir, therefore you can use command like:
mount -t ecryptfs /home/partimag/2017-10-29-04-img /tmp/ecryptfs_mntpoint -o ecryptfs_cipher=aes,ecryptfs_key_bytes=16,no_sig_cache,ecryptfs_enable_filename_crypto=n,ecryptfs_passthrough,key=passphrase:passphrase_passwd_file=/tmp/your_ecryptfs_file.txt

In the above example, you can put your password in /tmp/your_ecryptfs_file.txt. For more info about ecryptfs, you can check:
https://www.howtoforge.com/tutorial/how-to-encrypt-directories-and-partitions-with-ecryptfs-on-debian/

Steven