rsec/securestorage/keyfile is a SAP Parameter attribute which is used to control Path to file with key for the secure storage information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
You can use this parameter to specify a file that contains the global
key for the secure storage.
If no value is specified, a default key is used. This is enhanced with
system-dependent data and usually provides sufficient protection.
Due to the dangers associated with using your own key (see below), you
should only use this function if you require a greater than normal
degree of protection.
If a value is specified, this must be the path to a file that can be
accessed from the application server. This file must contain a
continuous sequence of 48 characters from the hexadecimal character set
(0-9, A-F) at the start of the file.
You can use the report RSECKEYGEN to generate a suitable key from a pass
If you specify only a file name, the system looks for this file in the
working directory of the application server.
The first time the key is changed from the default value (default key is
used) to another value, the entries encrypted with the default key are
automatically encrypted with the new key the next time they are
If you change the global key again, entries that were created with the
old key can no longer be decrypted. This means that a migration in
transaction SECSTORE is required. For more information, see the notes in
CAUTION Keep a copy of the key file in a secure location. If the file were to be lost, it would no longer be possible to access the entries in the secure storage that were saved with this key. This can have severe consequences for the entire system.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.