avast-ctf-cambridge-2018/Level 3/SOLUTION/SOLUTION_CONT2.md

We now have the bytes:

50 44 55 3E 30 30 30 31 30 30 30 31 38 31 46 30 30 30 31 30 30 43 36 31 37 36 33 39 39 43 30 45 38 46 45 39 45 31 46 32 39 43 30 45

We convert them to ASCII using xxd:

→ echo "50 44 55 3E 30 30 30 31 30 30 30 31 38 31 46 30 30 30 31 30 30 43 36 31 37 36 33 39 39 43 30 45 38 46 45 39 45 31 46 32 39 43 30 45" \
| xxd -p -r
PDU>0001000181F000100C6176399C0E8FE9E1F29C0E

An interesting output. If we Google PDU, we learn that it stands for protocol data unit. Surely there must be some form of a decoder then?

Indeed, another Google search reveals a PDU (SMS) decoder!

We decode our message and receive:

Text message
To:	0

Message:	
aleaiactaest

...snip...

Finally, the password for this level is: aleaiactaest