BlueHens
Barcode crypto [495 pts]
Writeup author: lolmenow
Provided files: barcode.txt
These barcodes seem to be missing something, can you help me figure it out? -AcerYeung
After I did some research, we know that each barcode number has a “check value” You can learn more (and a check value checker) here
In short, each array had barcode numbers, and barcode numbers has a “check” value for them, and each check value within each number in each array gave an ascii value. By using the above link for the checker, we get: 85 68 67 84 70 123 98 52 114 99 48 100 51 115 95 99 52 110 95 98 51 95 102 117 110 95 116 48 48 125
Decoding from ascii gives: UDCTF{b4rc0d3s_c4n_b3_fun_t00} and that is our flag!
Final flag: UDCTF{b4rc0d3s_c4n_b3_fun_t00}