18
\$\begingroup\$

Robber's challenge

This challenge challenges the Cop to write a non-empty program that, when run, produces some non-empty output in language A, and, when reversed, produces some non-empty output in language B. The program may produce any output to STDERR when run in either language, but may not take input in any way.

The cop should provide the following information:

  • The forwards program
  • The output when run in language A
  • The output when run backwards in language B

Robbers should attempt to find the two languages used

Rules

  • The criteria for a valid programming language are the same as those of The Programming Language Quiz, Mark II - Cops:

  • Each answer must run in less than a minute on a reasonable PC.

  • Different versions of a language count as the same language.

  • Languages with different flags are valid. However, flags must be revealed to avoid obscure combinations.

  • Cracking a submission consists of finding any pair of programming languages that work, not just the intended ones.

An answer is safe if it is not cracked until two months after the question is posted.

An answer can not compete one month after this challenge has been posted.

The shortest safe answer by byte count wins.

Example cop post

# ??? and ???, 128 bytes

```
print(1)#.++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
```

Language A expected output: `1`  
Language B expected output: `v`

and, when cracked,

# Python 3 and brainfuck, 128 bytes, cracked by [<user>](<link to robbers post>)

```
print(1)#.++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
```

Language A expected output: `1`  
Language B expected output: `v`

<explanation>
\$\endgroup\$
0

14 Answers 14

8
\$\begingroup\$

Japt and Seriously, 5 Bytes - Cracked by math junkie.

STINK

Language A expected output: the current date and time on the machine, in its locale formatted like so Sun Jun 05 2022 18:41:48 GMT+0100 (British Summer Time).

this is just the trailing K getting a JavaScript date()

Language B expected output of KNITS:









































































































































































































































































































                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,......................................................................................................................................................................................................000000000000000000000000000111111111111111111111111111111111111111111111111111111111111222222222222222222222222222222222222222222222222222222222222333333333333333333333333333333333333333333333333333333333333444444444444444444444444444444444444444444444444444444444444555555555555555555555555555555555555555555555555555555555555666666666666666666666666666666666666666666666666666666666666777777777777777777777777777777777777777777777777777777777777888888888888888888888888888888888888888888888888888888888888999999999999999999999999999999999999999999999999999999999999GTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbdddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeefffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiikkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll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..that is, in order:

\$298\$ newline characters
\$2278\$ space characters
\$198\$ ,s
\$198\$ .s
\$27\$ 0s
\$60\$ 1s
\$60\$ 2s
\$60\$ 3s
\$60\$ 4s
\$60\$ 5s
\$60\$ 6s
\$60\$ 7s
\$60\$ 8s
\$60\$ 9s
\$1\$ G
\$98\$ Ts
\$591\$ as
\$595\$ bs
\$295\$ ds
\$1289\$ es
\$297\$ fs
\$199\$ hs
\$98\$ is
\$98\$ ks
\$693\$ ls
\$2\$ ms
\$591\$ ns
\$1091\$ os
\$98\$ ps
\$397\$ rs
\$492\$ ss
\$893\$ ts
\$99\$ us
\$296\$ ws
\$1\$ y
\$1\$ newline character.

The N gets us the text of "99 Bottles of Beer", S then sorts the characters.

\$\endgroup\$
1
7
\$\begingroup\$

Gol><> and ;#+, 12 bytes, cracked by MathJunkie

push 72;ll-l

Language A expected output: 16

Language B expected output: -1

You got half the intended language pair right. But not the other half.

\$\endgroup\$
1
5
\$\begingroup\$

05AB1E and Noether, 5 bytes, cracked by Jonathan Allan

PLACO

Language A (forwards): 2483027905

Language B (backwards): 26

\$\endgroup\$
1
4
\$\begingroup\$

Befunge-96 and befunge-97, 8 bytes, Cracked by steffan

_2h2,@#>

Outputs 4 going forwards and 0x00 0x02 bytes going backwards.

Well, that lasted all of five minutes :P

\$\endgroup\$
1
3
\$\begingroup\$

Pyth and Pip, 6 bytes, cracked by whqwert

h+hTCG

Language A expected output: 156490583352162063278528710879425690470022892627113539022649734
Language B expected output: 98.29704308057353

\$\endgroup\$
1
3
\$\begingroup\$

StupidStackLanguage and Deadfish~, 12 bytes, cracked by math junkie

ioaddrsirmix

Language A (forwards): -1

Language B (backwards): 2

\$\endgroup\$
1
3
\$\begingroup\$

??? and ???, 11 bytes

23 45 67 ++

Forward:

4567
23

Note: It outputs exactly this in the official online interpreter. But it also outputs a few more trailing characters in other interpreters, presumably because of different command line arguments for the different ways handling standard input, which is not supported in the official online interpreter. But I think I don't need to reveal the flags, because this is the only way running the official online interpreter, which is linked from the official website linked from the Esolangs page.

Backward:

vT2

Should be easy because it's obvious how it works in both languages.

\$\endgroup\$
2
  • \$\begingroup\$ How it works forwards: pushes 23 to stack, pushes 45 to stack, pushes 67 to stack, concatenate 45 and 67 via ++, and implicit output. \$\endgroup\$ Jun 5 at 6:49
  • \$\begingroup\$ How it works backwards: ++ does nothing, pushes char with hex unicode 76 to stack, pushes char with hex unicode 54 to stack, pushes char with hex unicode 32 to stack, implicit output (or could the implicit output automatically convert numbers to the corresponding unicode characters? Not sure... These are just my guesses. I'm pretty sure both languages are stack-based. Upvote. \$\endgroup\$ Jun 5 at 6:50
3
\$\begingroup\$

BRASCA and Foo (or others), 2 bytes, cracked by jimmy23013

`"

Language A expected output: "
Language B expected output: `

They both start a string with the first character and implicitly end it (no ending string character), and therefore the other character is printed.

\$\endgroup\$
1
3
\$\begingroup\$

??? and ???, 41 bytes

say q@if-X	~h	$hL~hCF)o,AF)XD`hBZQ]P ,XQ@

The forward program prints:

if-X	~h	$hL~hCF)o,AF)XD`hBZQ]P ,XQ

Note the trailing newline.

The reverse program prints:

@QX, P]QZBh`DX)FA,o)FCh~Lh@QX, P]QZBh`DX)FA,o)FCh~Lh

One of these languages should be much easier than the other.

\$\endgroup\$
2
  • \$\begingroup\$ Do the languages satisfy the rules on what constitutes a programming language? (So it's not a variant of HQ9+ using $ as the eof character?) \$\endgroup\$
    – jimmy23013
    Jun 6 at 4:58
  • \$\begingroup\$ @jimmy23013 Yes, they are both definitely programming languages. \$\endgroup\$
    – Chris
    Jun 6 at 5:03
2
\$\begingroup\$

??? and ???, 209 bytes

+++++++++++++++++.++
++++++++++++++++++++
++++++++++++++++++++
++++++++++++++++++++
++++++++++++++++++++
++++++++++++++++++++
++++++++++++++++++++
++++++++++++++++++++
++++++++++++++++++++
:+++++++++++++++++++

Forward: 9

Backward: [

\$\endgroup\$
0
2
\$\begingroup\$

MarioLANG and brainfuck, 520 bytes, cracked by jimmy23013

...:+
>.>.-
-.---
-.---
-<.--
-->.+
+++-+
<<<.+
->.>+
->.-+
-----
-<.++
+++<+
-.->+
->.++
+++++
+++<-
+.++-
+>.<-
+.---
>.+++
->.<+
-<<<+
-<.>+
->..+
-.+>+
-.>.-
-.---
-.---
-<.--
-->.+
+++<+
-<<.+
->.>+
->.--
----+
-<.++
+++<+
-.->+
->.++
+++++
+++<+
-.+++
->.<+
-.---
>.+++
->.<+
-<<<+
-<.++
>>..+
-.+>+
-.>.-
-.---
-.---
-<.--
-->.+
+++<+
-<<.+
>.>>+
-.---
---<+
-.+++
++<.+
->>.+
+++++
+++++
-<.++
>.<.+
+>.-+
->.--
>]-<+
-<<<+
-<<++
->+++
+++++
>++++
>++++
+++++
+++>+
+++++
+++++
+++>+
+++++
+++++
->[++
+++++
:-++

Forwards: -25

Backwards:

Nobody is Awesome!!!
Nobody is Awesome!!!
Nobody is Awesome!!!
\$\endgroup\$
6
  • \$\begingroup\$ Is the forward output exactly -25? I found a language that also outputs a preceding null byte. \$\endgroup\$
    – jimmy23013
    Jun 5 at 8:48
  • \$\begingroup\$ @jimmy23013 exactly -25. Though can you state that language? \$\endgroup\$ Jun 5 at 11:33
  • \$\begingroup\$ Ah, I suppose that must be a red herring because it also outputted a trailing space. MarioLANG. Backward is brainfuck. \$\endgroup\$
    – jimmy23013
    Jun 6 at 0:27
  • \$\begingroup\$ Wait, does MarioLANG output the space? hmm... \$\endgroup\$ Jun 6 at 0:37
  • \$\begingroup\$ You cracked it. \$\endgroup\$ Jun 6 at 0:37
1
\$\begingroup\$

TrumpScript and A Pear Tree, 4 bytes, cracked by whqwert

Forwards:

+:
:+
0O

Backwards:

O0
+:
:+

Forwards:

Parsing error:
What are you doing on line 3?

Backwards:

a partridge

Should be quite easy...

\$\endgroup\$
3
  • \$\begingroup\$ Backwards is A Pear Tree of course but I'm too lazy to go find out the other one \$\endgroup\$
    – Steffan
    Jun 5 at 4:00
  • \$\begingroup\$ Correct, Backwards is a pear tree \$\endgroup\$ Jun 5 at 4:06
  • 1
    \$\begingroup\$ Cracked \$\endgroup\$
    – whqwert
    Jun 5 at 4:08
1
\$\begingroup\$

??? and ???, 57 bytes

MAIN()
  write (stream<OUT>, *MAIN, z)

start: go MAIN -i

Language A expected output: three null bytes in a row (\0\0\0)

Language B expected output: ␁N␁N␁N␁N␁N␁N␁N␁N␁N␁N␁N␁N␁N, with replaced with an actual Start of Heading character


This one should be very hard to crack.

\$\endgroup\$
0
\$\begingroup\$

Forwards:

"""+!|>1bab@|!+"""1110111p exit;"1" tuO

Backwards:

Out "1";tixe p1110111"""+!|@bab1>|!+"""

Forwards output:

1110111

Backwards output:


1

Shouldn't be too bad.

\$\endgroup\$

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