The data is decrypted on client side after obtaining DEK from KMS, *not* decrypted by DN. Right, currently DEK is better to be protected by https on the wire.
If you want to confirm the file is encrypted, one way is to see the content of file blocks. Regards, Yi Liu From: Rajesh Kartha [mailto:karth...@gmail.com] Sent: Wednesday, February 25, 2015 3:48 AM To: u...@hadoop.apache.org Cc: hdfs-dev@hadoop.apache.org Subject: Re: Encryption At Rest Question I was trying out the Transparent data at rest encryption and was able to setup the KMS, zones etc. and add files to the zone. How do I confirm if the files I added to the encryption zone are encrypted ? Is there a way to view the raw file, a hdfs fs -cat shows me the actual contents of the files since the datanode decrypts it before sending it. Thanks, Rajesh On Fri, Feb 20, 2015 at 11:42 PM, Ranadip Chatterjee <ranadi...@gmail.com<mailto:ranadi...@gmail.com>> wrote: In case of SSL enabled cluster, the DEK will be encrypted on the wire by the SSL layer. In case of non-SSL enabled cluster, it is not. But the intercepter only gets the DEK and not the encrypted data, so the data is still safe. Only if the intercepter also manages to gain access to the encrypted data block and associate that with the corresponding DEK, then the data is compromised. Given that each HDFS file has a different DEK, the intercepter has to gain quite a bit of access before the data is compromised. On 18 February 2015 at 00:04, Plamen Jeliazkov <plamen.jeliaz...@wandisco.com<mailto:plamen.jeliaz...@wandisco.com>> wrote: Hey guys, I had a question about how the new file encryption work done primarily in HDFS-6134. I was just curious, how is the DEK protected on the wire? Particularly after the KMS decrypts the EDEK and returns it to the client. Thanks, -Plamen 5 reasons your Hadoop needs WANdisco<http://www.wandisco.com/system/files/documentation/5-Reasons.pdf> Listed on the London Stock Exchange: WAND<http://www.bloomberg.com/quote/WAND:LN> THIS MESSAGE AND ANY ATTACHMENTS ARE CONFIDENTIAL, PROPRIETARY, AND MAY BE PRIVILEGED. If this message was misdirected, WANdisco, Inc. and its subsidiaries, ("WANdisco") does not waive any confidentiality or privilege. If you are not the intended recipient, please notify us immediately and destroy the message without disclosing its contents to anyone. Any distribution, use or copying of this e-mail or the information it contains by other than an intended recipient is unauthorized. The views and opinions expressed in this e-mail message are the author's own and may not reflect the views and opinions of WANdisco, unless the author is authorized by WANdisco to express such views or opinions on its behalf. All email sent to or from this address is subject to electronic storage and review by WANdisco. Although WANdisco operates anti-virus programs, it does not accept responsibility for any damage whatsoever caused by viruses being passed. -- Regards, Ranadip Chatterjee
