vic...@stupid:~$ ecryptfs-unwrap-passphrase ./.ecryptfs/wrapped-passphrase 
Passphrase: password
Warning: Using default salt value (undefined in ~/.ecryptfsrc)
(passphrase)vic...@stupid:~$ passwd
Changing password for victim.
(current) UNIX password: password
Enter new UNIX password: a
Retype new UNIX password: a
You must choose a longer password
Enter new UNIX password: a
Retype new UNIX password: a
You must choose a longer password
Enter new UNIX password: a
Retype new UNIX password: a
You must choose a longer password
passwd: password updated successfully
vic...@stupid:~$ ecryptfs-unwrap-passphrase ./.ecryptfs/wrapped-passphrase 
Passphrase: password
Warning: Using default salt value (undefined in ~/.ecryptfsrc)
Error: Unwrapping passphrase failed [-5]
Info: Check the system log for more information from libecryptfs
vic...@stupid:~$ ecryptfs-unwrap-passphrase ./.ecryptfs/wrapped-passphrase 
Passphrase: a
Warning: Using default salt value (undefined in ~/.ecryptfsrc)
(passphrase)vic...@stupid:~$ su victim
Password: a
su: Authentication failure
vic...@stupid:~$ su victim
Password: password
vic...@stupid:~$

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ecryptfs private wrapped passphrase with wrong password during password change
https://bugs.launchpad.net/bugs/305882
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