collisions for md5:

echo d131dd02c5e6eec4693d9a0698aff95c2fcab58712467eab4004583eb8fb7f89 > 1.asc
echo d131dd02c5e6eec4693d9a0698aff95c2fcab50712467eab4004583eb8fb7f89 > 2.asc
echo 55ad340609f4b30283e488832571415a085125e8f7cdc99fd91dbdf280373c5b >> 1.asc
echo 55ad340609f4b30283e4888325f1415a085125e8f7cdc99fd91dbd7280373c5b >> 2.asc
echo d8823e3156348f5bae6dacd436c919c6dd53e2b487da03fd02396306d248cda0 >> 1.asc
echo d8823e3156348f5bae6dacd436c919c6dd53e23487da03fd02396306d248cda0 >> 2.asc
echo e99f33420f577ee8ce54b67080a80d1ec69821bcb6a8839396f9652b6ff72a70 >> 1.asc
echo e99f33420f577ee8ce54b67080280d1ec69821bcb6a8839396f965ab6ff72a70 >> 2.asc
xxd -r -p 1.asc > 1.bin
xxd -r -p 2.asc > 2.bin
if cmp -l 1.bin 2.bin;then echo the two files are identical...;else echo the two files are different;fi
md5sum 1.bin 2.bin

1.bin 2.bin differ:
 20 207   7
 46 161 361
 60 362 162
 84 264  64
110 250  50
124  53 253
the two files are different
79054025255fb1a26e4bc422aef54eb4  1.bin
79054025255fb1a26e4bc422aef54eb4  2.bin

There are people who find it odd to eat four or five Chinese meals
in a row; in China, I often remind them, there are a billion or so
people who find nothing odd about it.
                -- Calvin Trillin