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Re: ERS RFC 4998 question


Thomas Kunz wrote:


The root hash value is presented directly to the TSA.
I would say, before building the hash tree, you have to ensure that the hash algorithm you use is supported by the TSA. Otherwise, if the hash algorithm is not supported, you will have to re-compute the complete hash tree.
Or you have to have a way of specifying any number of Hash Values which could be supported by the TSA in its operations. 

Todd


- Thomas


Peter Sylvester schrieb:

Hi,

In a recent discussion I was asked to explain how the timestamp
in an ERS ArchiveTimeStamp is created.
The text does not seem to be clear, point 5 on page 11:

5 Obtain a timestamp for this root hash value.
Does it mean that the hash value will be presented directly
or a hash of that value.

If it is presented directly, what has to be done for the root
when the algorithm supported by a TSA and the digestAlgorithm
indicated in the ArchiveTimeStamp are not the same?

TIA for any info
/P



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