tl;dr
- Find the co-relation between variables in the LFSR equation
- d == out (75%)
- a == b (75%)
- c^d == out (75%)
- (d!= out) => (c==1) always
- Solve for the seed using 2000 output bits
- Try out which among the four possible combinations decrypt the flag
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In this blog, we are going to share the experience of creating our first electronic badge.