Re: [Drip] drip-rid-18 - CTA 2063-A encoding changes

[Robert Moskowitz <[e-mail]>]

ARGH!!!!

I need a nap....

2^5 - 2^2 = 28.

Sigh.

Signing off for an hour.  Too short of a night.  Us septarians (speeling 
? 70-year olds :) ) need our sleep....

On 3/29/22 09:06, Robert Moskowitz wrote:
> OOPs. One small correction.
>
> The manufacturer can have 24 SN encodings in the Base32 approach as 
> 2^5 - 2^3 is 24.
>
> On 3/29/22 08:22, Robert Moskowitz wrote:
>>
>>
>> On 3/28/22 08:33, Robert Moskowitz wrote:
>>> I am going through the changes I missed needed since decreasing the 
>>> HID to 28 bits.
>>>
>>> Just caught that sec 4.2, CTA 2063-A needs to be reworked. Need 4 
>>> more bits, it MAY be easy, I have not done the work yet, but heads 
>>> up on this one...
>>
>> I have time to think more on this.
>>
>> If I stay with the Base32 encoding, I will have to use 2 bits from 
>> the 1st character in the Serial Number field.  This would work if we 
>> reserve values of W,X,Y, and Z (first 3 bits 1s) for that encoding.
>>
>> This approach would allow manufactures to still have 7 possible 14 
>> character encodings under their manufacturing code. (0 - V)
>>
>> I do note, now one 'error' in this section.  I say to avoid using 'Z' 
>> as it is too similar to '2':
>>
>> "Thus, here a Base32 encoding will be used by also excluding the 
>> letters Z and S (too similar to the digits 2 and 5)."
>>
>> Yet then I go and use it to identify HHIT encoded in 2063!
>>
>> "The first character after the Length Code MUST be 'Z', followed by 
>> the 14 characters of the encoded HIT Suite ID and ORCHID hash."
>>
>> Argh.
>>
>> Suggestions?  Should I thus use V, W, X, and Y to encode 11100, 
>> 11101, 11110, and 11111?
>>
>> Or I can use the Base34 encoding and then there is plenty of space in 
>> 14 characters for 72 bits.
>>
>> Comments please.
>>
>> I would like to get this done by end of week, and Friday I have 3 
>> grandchildren (and their parents :) ) descending on the house! Won't 
>> get too much writing done then as the youngest (5 mo) uses my office 
>> for her bedroom.
>>
>> Bob
>>
>

-- 
Standard Robert Moskowitz
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