Decrypt Synology Backups in Linux

Scenario

You have access to a folder encrypted by a Synology NAS in Linux and you want to decrypt it (without the Synology). Example: offsite backup of an encrypted Synology folder.

Steps

1. Install ecryptfs

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$ sudo apt-get install ecryptfs-utils

2. Create a mount point

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sudo mkdir /mnt/synology

3. Mount the folder Mount the folder and use the password/key from the original encryption on the Synology.

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$ mount -t ecryptfs /path/to/src /mnt/synology_decrypt
# aes
# 32 bytes
# plaintext passthrough - n
# filename encryption - y

References

• http://robertcastle.com/2012/10/howto-recover-synology-encrypted-folders-in-linux/
• http://www.thenakedscientists.com/forum/index.php?topic=49888.0