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The general-purpose security block format provides for specification of whether the biometric data block (BDB) is encrypted or the SBH and BDB have integrity applied (or both), and can include ACBio instances (see ISO/IEC 24761). This security block provides all necessary security parameters, including those used for encryption or integrity.
It does not restrict the algorithms and parameters used for encryption or integrity, but provides for the recording of such algorithms and parameter values.
It is a matter for profiling to determine, for a particular application area, what algorithms and parameter ranges can be used by the generator of a security block, and hence what algorithms and parameter ranges have to be supported by the user of a security block. This is out of the scope of ISO/IEC 19785-4:2010.
The second security block is more limited, but simpler (and in particular cannot contain ACBio instances, and does not support encryption of the BDB).