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From "Jerry Chen (JIRA)" <>
Subject [jira] [Commented] (HIVE-5207) Support data encryption for Hive tables
Date Mon, 14 Oct 2013 03:29:44 GMT


Jerry Chen commented on HIVE-5207:

Hi Larry, thanks for you pointing out the docs. Yes, we will complement more javadocs and
document as our next work.
{quote}1. TwoTieredKey - exactly the purpose, how it's used what the tiers are, etc{quote}
TwoTiredKey is used for the case that the table key is stored in the Hive metastore. The table
key will be encrypted with the master key which is provided externally. In this case, user
maintains and manages only the master key externally other than manages all the table keys
externally. This is useful when there is no full-fledged key management system available.
{quote}2. External KeyManagement integration - where and what is the expected contract for
this integration{quote}
To integrate with external key management system, we use the KeyProvider interface in HADOOP-9331.
Implementation of KeyProvider interface for a specified key management system can be set as
KeyProvider for retrieving key.
{quote}3. A specific usecase description for exporting keys into an external keystore and
who has the authority to initiate the export and where the password comes from{quote}
Exporting of the internal keys comes with the Hive command line. As the internal table keys
were encrypted with the master key, when performing the exporting, the master key must be
provided in the environment which is controlled by the user.  If the master key is not available,
the encrypted table keys for exporting cannot be decrypted and thus cannot be exported. The
KeyProvider implementation for retrieving master key can provide its own authentication and
authorization for deciding whether the current user has access to a specific key.
{quote}4. An explanation as to why we should ever store the key with the data which seems
like a bad idea. I understand that it is encrypted with the master secret - which takes me
to the next question.  {quote}
Exactly speaking, it is not with the data. The table key is stored in the Hive metastore.
I see your points at this question. Just as mentioned, for use cases that there is no full-fledged
and ready to use key management system available, it is useful. We provide several alternatives
for managing keys. When creating an encrypted table, user can specify whether the key is managed
externally or internally. For externally managed keys, only the key name (alias) will be stored
in the Hive metastore and the key will be retrieved through KeyProvider set in the configuration.
{quote}5. Where is the master secret established and stored and how is it protected{quote}
Currently, we assume that the user manages the master key. For example, for simple uses cases,
he can stores the master key in java KeyStore which protected by a password and stores in
the folder which is read-only for specific user or groups. User can also stores the master
key in other key management system as the master key is retrieved through KeyProvider.
Really appreciate your time reviewing this.

> Support data encryption for Hive tables
> ---------------------------------------
>                 Key: HIVE-5207
>                 URL:
>             Project: Hive
>          Issue Type: New Feature
>    Affects Versions: 0.12.0
>            Reporter: Jerry Chen
>              Labels: Rhino
>         Attachments: HIVE-5207.patch, HIVE-5207.patch
>   Original Estimate: 504h
>  Remaining Estimate: 504h
> For sensitive and legally protected data such as personal information, it is a common
practice that the data is stored encrypted in the file system. To enable Hive with the ability
to store and query the encrypted data is very crucial for Hive data analysis in enterprise.

> When creating table, user can specify whether a table is an encrypted table or not by
specify a property in TBLPROPERTIES. Once an encrypted table is created, query on the encrypted
table is transparent as long as the corresponding key management facilities are set in the
running environment of query. We can use hadoop crypto provided by HADOOP-9331 for underlying
data encryption and decryption. 
> As to key management, we would support several common key management use cases. First,
the table key (data key) can be stored in the Hive metastore associated with the table in
properties. The table key can be explicit specified or auto generated and will be encrypted
with a master key. There are cases that the data being processed is generated by other applications,
we need to support externally managed or imported table keys. Also, the data generated by
Hive may be consumed by other applications in the system. We need to a tool or command for
exporting the table key to a java keystore for using externally.
> To handle versions of Hadoop that do not have crypto support, we can avoid compilation
problems by segregating crypto API usage into separate files (shims) to be included only if
a flag is defined on the Ant command line (something like –Dcrypto=true).

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