Polycom 1725-11530-310 manual Changing the Key on the Phone, Option. This shows the digest field

Miscellaneous Administrative Tasks

	You can check whether an encrypted file is the same as an unencrypted file by:
	1. Run the configFileEncrypt utility on the unencrypted file with the "-d"
	option. This shows the "digest" field.
	2. Look at the encrypted file using WordPad and check the first line that
	shows a "Digest=…." field. If the two fields are the same, then the
	encrypted and unencrypted file are the same.
Note
	If a phone downloads an encrypted file that it cannot decrypt, the action is logged,
	an error message displays, and the phone reboots. The phone will continue to do
	this until the boot server provides an encrypted file that can be read, an
	unencrypted file, or the file is removed from the master configuration file list.
Note
	The SoundPoint IP 300 and 500 phones will always fail at decrypting files. These
	phones will recognize that a file is encrypted, but cannot decrypt it and will display
	an error. This information is logged. Encrypted configuration files can only be
	decrypted on the SoundPoint IP 301, 320, 330, 430, 501,550, 560, 600, 601, 650,
	and 670 and the SoundStation IP 4000, 6000, and 7000 phones.
	The master configuration file cannot be encrypted on the boot server. This file is
	downloaded by the bootROM that does not recognize encrypted files. For more
	information, refer to Master Configuration Files on page 2-5.
	The following configuration file changes are required to modify this feature:
Central	Configuration File: sip.cfg	Specify the phone-specific contact directory and the
(boot server)		phone-specific configuration override file.
		For more information, refer to Encryption
		<encryption/> on page A-89.
	Configuration file:	Change the encryption key.
	<device>.cfg	For more information, refer to Flash Parameter
		Configuration on page A-124.

Changing the Key on the Phone

For security purposes, it may be desirable to change the key on the phones and the server from time to time.

To change a key:

1.Put the new key into a configuration file that is in the list of files downloaded by the phone (specified in 000000000000.cfg or <Ethernet address>.cfg).

Use the device.sec.configEncryption.key parameter to specify the new key.

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