# This is a tough one!

Can you crack this code?

Hint : It decrypts to an English plain text word(s) and no one-way hashes have been used!

Code

31 30 35 20 31 32 31 20 31 30 31 20 36 38

20 37 30 20 37 31 20 35 34 20 31 31 39 20

31 31 34 20 37 34 20 37 35 20 36 35 20 31

32 32 20 31 30 36 20 35 33 20 31 30 38 20

31 30 31 20 37 33 20 31 31 36 20 31 31 32

20 39 30 20 31 31 34 20 31 31 31 20 38 32

20 38 34 20 31 31 31 20 31 31 30 20 38 39

20 31 31 35 20 35 37 20 31 30 39 20 36 36

20 35 38 20 35 38 20 34 39 20 35 30 20 35

31 20 35 32 20 35 33 20 35 34 20 00 00 00

It's interesting that with the exception of the three 00s at the end, all of the numbers are either 20 or 30 through 39. Those happen to be the hex for the ASCII codes for space and the numerals 0 through 9. Taking that as a "first level" encypher, I get 105 121 101 68 70 71 51 119 114 74 75 65 122 106 53 108 101 73 116 112 90 114 111 82 84 111 110 89 115 57 109 66 58 58 49 50 51 52 53 54 and three terminating NULs. The next logical step is to assume that these are again ASCII codes - in Decimal this time - and take their printed representations: iyeDFG6wrJKAzj5leitpZroRYonYs7mB::123456. Unfortunately, this is as far as I've been able to go; it's not a base-64-decodeable string.
• What interests me is the ending ::123456 in the printed representations of the decimal ASCII codes. I wonder if that could be a clue? – K Zhang Aug 16 '17 at 22:42