ASCII Sentence

Decode this

100711121149972741021008657108908882106995078558951781211005057107977111610288508657997190104885070118901095348885110811897728161

After solving you will get a flag in the format of pctf{code}, change it to p_ctf{code} and submit it.

Recon

Chunk up the numbers into printable ASCII range integers:

$ php -r '$a=explode(" ", "100 71 112 114 99 72 74 102 100 86 57 108 90 88 82 106 99 50 78 55 89 51 78 121 100 50 57 107 97 71 116 102 88 50 86 57 99 71 90 104 88 50 70 118 90 109 53 48 88 51 108 118 97 72 81 61"); foreach($a as $b) echo chr($b);' ; echo

dGprcHJfdV9lZXRjc2N7Y3Nyd29kaGtfX2V9cGZhX2FvZm50X3lvaHQ=

base64 decode:

$ echo dGprcHJfdV9lZXRjc2N7Y3Nyd29kaGtfX2V9cGZhX2FvZm50X3lvaHQ= | base64 -d tjkpr_u_eetcsc{csrwodhk__e}pfa_aofnt_yoht

Flag

dcode.fr/transposition-cipher

PCTF{JACK_SPARROW_FOUND_THE_KEY_TO_CHEST}C