Summary

Recommendation ITU-T H.235.6 holds the security procedures for the encryption profile (formerly in Annex D of Recommendation ITU-T H.235 version 1) including the accompanying native ITU‑T H.235/H.245 key management.

This revision introduces support for key lengths larger than 2048 bits. In previous versions, bit sizes of 3072 and 4096 were defined. However, the field size defined in Recommendation ITU-T H.235.0 was limited to 2048 bits.

Version 4 of Recommendation ITU-T H.235 broke up Recommendation ITU-T H.235 version 3 into a suite of ITU-T H.235.x sub-series Recommendations, and it restructured the sub-series. In earlier versions, prior to version 4 of the ITU-T H.235 sub-series, this profile was contained in the main body and Annex D of Recommendation ITU-T H.235 version 1. Appendices IV, V and VI to Recommendation ITU-T H.235.0 show the complete clause, figure and table mapping between Recommendation ITU-T H.235 versions 3 and 4.