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# Encryption in IDOL

HPE IDOL Server uses encryption in various operations. This article describes some of the methods it uses.

Note: In HPE IDOL Server, the document Access Control Lists (ACLs) are obfuscated to disguise the data values, rather than encrypted.

## Transport Layer Security

You can configure the HPE IDOL Server ACI, Service, and Index ports to use Transport Layer Security/Secure Sockets Layer (TLS/SSL). You can configure this by setting the `SSLConfig` parameter. This parameter is available in various configuration sections, to set SSL settings for the different ports. You set the `SSLConfig` parameter to a configuration section that contains the SSL settings that you want to use for that port or communication type. For more information, refer to the IDOL Server Administration Guide.

This configuration allows you to use HTTPS, rather than plain HTTP for communication between HPE IDOL components. Certificates allow you to lock down this communication to trusted sources and destinations.

The `SSLConfig` configuration mechanism is also used to configure outgoing connections to secured components, for example in the configuration of an SSL-enabled child server in a DAH configuration.

## Application Level Encryption

IDOL can use a number of application level security methods.

GSSAPI

HPE IDOL Server can use the Generic Security Services Application Program Interface (GSSAPI) to establish a security context between components and then encrypt messages that pass between those components. This method is available only for the ACI port. The components establish the context with an action. Further messages are encrypted by the API, and wrapped inside ACI encryption.

GSSAPI encryption requires the use of a client connection that supports persistent connections, because the context object is associated with a particular connection.

You configure GSSAPI by using the `CommsEncryptionType` configuration parameter. For more information, refer to the IDOL Server Reference. The IDOL SDKs provide methods for using GSSAPI encryption with your applications.

AES Encryption

AES encryption uses the Advanced Encryption Standard. You can use AES encryption to encrypt `SecurityInfo` strings. To enable AES encryption, you can set the `SecurityInfoKeys` configuration parameter to the name of the AES key file. HPE IDOL Server then uses this key file to encrypt and decrypt the strings. The IDOL SDKs provide methods for using AES encryption with your applications.

ACI and OEM Encryption

ACI encryption is a generic mechanism for encrypting the contents of ACI communication. The `Encrypted` action allows you to send an encrypted action in the `Data` parameter, and responses include `<autn:encrypteddata>` tags with the encrypted responses. The encryption can use BTEA or AES encryption, or GSSAPI. ACI encryption is always optional for components communicating on the same host.

OEM encryption is enforced ACI encryption. The request must always be ACI encrypted, but the response is always sent unencrypted. All components must share the OEM encryption key.

An IDOL component running with OEM license keys (without a LicenseServer component) is enforced by the license to use ACI encryption. You do not need to configure ACI encryption when you are using an OEM license, and any ACI encryption configuration is overridden by the OEM licensing. The IDOL SDKs provide methods to work with the OEM communication key provided with the license key.

SecurityInfo

The SecurityInfo string identifies the documents that a user is allowed to see, by checking user and group permissions against the document ACL for the chosen security model. You can set the `SecurityInfoKeys` configuration parameter to configure SecurityInfo strings to use either BTEA or AES encryption, by setting it to a list of BTEA keys, or the file name of the AES key file.

For BTEA encryption, the `SecurityInfoKeys` parameter takes a comma-separated list of four signed 32-bit integers (between 0 and 2147483647). The default HPE IDOL Server configuration file gives a default set of keys. You must always change this default value when you install HPE IDOL Server. The BTEA keys are stored in plain text in the configuration file, so be aware of who has access to this file.

For a more secure setting, you can set SecurityInfoKeys to the filename and path of an AES key file. AES is a more secure encryption algorithm. The key file must consist of exactly 64 hexadecimal characters. To prevent unauthorized access, limit access to the key file to the users that the HPE IDOL services run under.

You must set `SecurityInfoKeys` to the same value for all components.

Configuration Files

Some configuration parameters accept encrypted values. You can generate encrypted values for these parameters by using the `autpassword` command-line tool.

Typically you can encrypt password parameters.

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