1. Hash functions derived from black ciphers {5+5+5+5 Hunks) Let BK : {0,1}123 I- {,1}128 be an ideal hlm-lt cipher with 111033:th 31mm [l],1}123, ciphertext spam {I}, 1}\"3, and lmy Spam {,1}123L Let :1; and y denote hitstriuga of length 128. Which of the fellawing hash mctinue H,- : {I}, 1}ma > {0, 1}123, if any, are prelmage rmistamt? Expkn. {a} H1l$syl = Eyly) 33' 3- lhl' H2{::,y) = Er}