Which of the following is true about using the MD$5$ hash to authenticate encrypted messages? a$.$ It is considered secure for authentication and is still in use. b$.$ There are theoretical ways to create collisions for MD$5,$ but these have not been replicated in the real world. Since the attacks are only theoretical MD$5$ is still considered safe to use for authentication. c$.$ MD$5$ is considered broken because it is not collision resistant, and it should not be used for authentication. d$.$ MD$5-128$ is considered broken and should not be used for aThe MD$5$ hash is considered broken, since collisions have been found

and, in fact, a collision can be constructed in a few seconds on a PC

$[244].$ Find all bit positions where the following two messages differ. ${?}^{13}$

Verify that the MD$5$ hashes of these two messages are the same.

and

$00000000$ di $31$ dd $02$ c$5$ e$6$ ee c$4693$d $9$ a $06$ af $98$ af $5$ c

$00000020,55ad34,06,09f4b302,83e488,83,25f1,41,5a$

$00000030,08,51,25$ e $8$ f$7$ cd c$99$ f $,$ d$91d$ bd $72,80,37,3c,5b$

$0000004096$ ob $1$d d$1$ dc $41,7$ b $9$ c e$4$ d$897$ f$445$a $6555$ d$5$

$00000050,35,73,9a,47$ fo eb fd $0c,30,29$ f $166$ d$109$ b$18f$

$0000006075,27,7f7930$ d$55c$ eb $22$ e $8$ ad ba $794c155c$

$00000070$ ed $74cb$ dd $5f$ c$5$ d$36$d b$19$b $0$a $58,35$ cc a$7$ e$3$uthentication. MD$5-256$ and MD$5-512$ are still considered secure and are still in use. e$.$ None of the above