.nf .PS scale=100 define t123 | [ box invis ht 32 wid 74 with .sw at 0,0 "\fR\s10\&Datakit\f1\s0" at 37,24 "\fR\s10\&Controller\f1\s0" at 37,8 ] | define m0 | [ box invis ht 104 wid 40 with .sw at 0,0 "\fR\s10\&host\f1\s0" at 20,34 box ht 104 wid 40 with .nw at 0,104 box ht 8 wid 24 with .nw at 8,64 box ht 24 wid 24 with .nw at 8,96 ] | define m1 | [ box invis ht 96 wid 96 with .sw at 0,0 circle rad 48 at 48,48 t123 with .nw at 11,62 ] | define m2 | [ box invis ht 128 wid 40 with .sw at 0,0 m0 with .nw at 0,104 "\fR\s10\&hosta\f1\s0" at 20,114 ] | box invis ht 368 wid 512 with .sw at 0,0 "\fR\s10\&4. CALL hostb\f1\s0" at 52,54 ljust line -> from 136,72 to 48,72 dashed line from 136,232 to 136,72 dashed "\fR\s10\&3. CALL hosta\f1\s0" at 232,10 ljust line -> from 144,24 to 464,24 dashed line from 144,232 to 144,24 dashed line from 168,328 to 184,312 line from 184,344 to 168,328 line from 392,328 to 376,312 line from 376,344 to 392,328 "\fR\s10\&2. AUTHENTICATION\f1\s0" at 280,326 line from 384,320 to 176,320 line from 176,336 to 384,336 "\fR\s10\&hostb\f1\s0" at 20,130 m2 with .nw at 472,128 m0 with .nw at 424,320 line -> from 408,144 to 408,288 dashed line from 152,144 to 408,144 dashed "\fR\s10\&1. CALL security\f1\s0" at 156,154 ljust line from 152,288 to 152,144 dashed line from 472,64 to 320,88 "\fR\s10\&security\f1\s0" at 444,330 m1 with .nw at 224,136 line from 136,264 to 144,240 line from 56,240 to 64,264 line from 72,328 to 72,288 line from 128,288 to 128,328 arc from 120,280 to 128,288 at 120,288 arc from 80,336 to 72,328 at 80,328 line from 424,272 to 320,96 line from 136,304 to 224,96 "\fR\s10\&GNOT\f1\s0" at 100,354 box ht 72 wid 72 with .nw at 64,344 arc from 72,288 to 80,280 at 80,288 line from 120,336 to 80,336 arc from 128,328 to 120,336 at 120,328 line from 80,280 to 120,280 line from 64,264 to 136,264 line from 144,240 to 56,240 line from 224,88 to 40,88 m0 with .nw at 0,120 .PE .fi