!!! Overview
[{$pagename}] attribute holds a history of previously used passwords. Values of this attribute are transmitted in string format as given by the following ABNF:

pwdHistory = time "#" syntaxOID "#" length "#" data
 time = [GeneralizedTime]

syntaxOID  = numericoid ; the string representation of the
* dotted-decimal OID that defines the
* syntax used to store the password.

length  = number  ; the number of octets in data.

data = <octets representing the password in the format specified by syntaxOID>.

This format allows the server to store, and transmit a history of passwords that have been used. In order for equality matching to function properly, the time field needs to adhere to a consistent format. For this purpose, the time field MUST be in GMT format.

[{$pagename}] is defined as 
* [OID] of [1.3.6.1.4.1.42.2.27.8.1.20] 
* NAME [{$pagename}]
* DESC 'The history of user s passwords'
* [EQUALITY] [octetStringMatch]
* SYNTAX [1.3.6.1.4.1.1466.115.121.1.40]
* [NO-USER-MODIFICATION]
* USAGE [DirectoryOperation] 

!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]