Brahm Kavach is a great bani of the Khalsa Panth. Here is the link to to Brahm Kavach of the Khalsa
http://tisarpanth.blogspot.in/2013/04/the-armour-of-god-three-kavachs-of-guru.html
Now, in Chandi Charitar of Dasam Granth Sahib, there is also mention of Brahm kavach and I was told by Nihangs that this Brahm Kavach is the same as Brahm Kavach of the Khalsa.
I searched for Brahm Kavach in Mahan Kosh of Bhai Kahn Singh Nabha and he mentions that there is a brahm kavach in the Varah Purana and this brahm kavach is about durga.
Mahan Kosh Encyclopedia
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So I want to know that the brahm kavach mentioned in Chandi Charitar is brahm kavach of varah purana or brahm kavach of Khalsa.
Thanks