I don't want to kill this conversation but it might need to wait until I
have a real keyboard. CAS IRC chat on Monday?  Otherwise my responses will
continue to be short.
On Apr 7, 2011 11:14 AM, "Scott Battaglia" <[email protected]>
wrote:
> Yes the CAS protocol requirement is to be unguessable. Web Flow requires a
> guessable parsable string with particular values. We solve both by
attaching
> a random string in front of the guessable part and encrypting it. The uuid
> part is useless. Web Flow only cares about the second part. But if you
just
> encrypted the existing web flow key it would always be the same value.
> On Apr 7, 2011 10:36 AM, "Marvin Addison" <[email protected]>
wrote:
>>> We use the random part of the key to make the encrypted part
unguessable.
>>
>> I thought the only requirement here (for protocol adherence) is that
>> the whole LT identifier is unguessable, which is is prior to
>> encryption. Are you saying encryption is required for some technical
>> reason in SWF? I don't see a security reason to encrypt.
>>
>>> That said I can see if we can
>>> create keys by phrase rather than by secret key which could make
> management
>>> easier.
>>
>> Password-based encryption would be preferable, but it's still another
>> (albeit easier) kind of key management. I'm still trying to identify
>> the core reason for encryption: technical or security.
>>
>> M
>>
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