It's a nit in the big picture of this thing, but 2**31 maximum, right? The 
low-order bit would always be zero, no?

Charles

-----Original Message-----
From: IBM Mainframe Assembler List <ASSEMBLER-LIST@LISTSERV.UGA.EDU> On Behalf 
Of Phil Smith III
Sent: Wednesday, September 3, 2025 2:16 PM
To: ASSEMBLER-LIST@LISTSERV.UGA.EDU
Subject: Re: Question about HLASM complex relocatable expressions

Jon Perryman wrote, in part:
>I could see someone else using A(DXD + DXD) as a random encryption / 
>decryption key that changes at IPL.

Ick. That's not even close to secure. Assuming it's below the bar, that's a max 
of 2**32 keys, not even DES strength. And that's assuming you can't further cut 
it by saying it's gonna be fullword or doubleword aligned...

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