I guess this is twofold: First we assume they are the same when there really is 
no reason an attacker would do so. So we can end up with different signatures 
depending on the rpm version being used.

Then there's this "the newer rpm could check this but we leave that to the 
older version that has less of a chance to figure things out". Not sure if this 
really is realistic this "use rpm V6 to check signatures and then hand the 
packages down to an older rpm version". Otoh there is this post quantum talk. 
As soon as we do have policies requiring specific signatures may be there is a 
way to sneak in weak signatures this way.

May be this is just fine for now and we need to look at this later on when we 
get into policy based verification.

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