Fir Security

model	signatures checked	updater(s) protection	announce date	comments
50D	yes, only first one at 0x68	xor 512/513 bytes tables	8/2008	see fw_dissect and fir_tool.py. 2007' key for payload encryption
5Dm2	no	xor 512/513 bytes tables	9/2008	2007' key
500D/T1i	no	xor 512/513 bytes tables	3/2009	2007' key
7D	yes	xor 512/513 bytes tables	9/2009	2007' keys for signatures and payload encryption
550D/T2i	yes	AES	2/2010	new 2010' keys signatures and payload encryption
60D	yes	AES	8/2010	2010' keys
600D/T3i	yes	AES	2/2011	2010' keys
1100D/T3	?	?	2/2011