Didactic Feedback Cipher

[sabretooth]

Really really liked this one. Definitely made me think

No bruteforce needed indeed

sabretooth

[aurora]

indeed ... no brute-force needed. the solution was quite insightful for me. interesting challange ...

[bboy]

I had WFT moment after solving this crypto. Really interesting .

[AgRaven]

Haha, I've been using these crypto chalanges as motivation and goal setting for learning my way through c++ . I spent some time on this one thinking the wrong way, and the output my code gave me (as a modified version of other programs I wrote for cyphers) just underlined that mistake.... made me laugh.

[marko9900]

IT seems like im trying to brute force it I wrote a simple code in python, that gives me all 256 possibilities. Only thing missing is to convet alla those int oASCII.

Any guidance for me?

[TheBigBoss]

Any guidance for me?

Surely you're joking...

[aurquiel]

In this code

Code: Select all

k = {unknown byte}
for (i = 0; i < len(txt); i++)
  c = txt[i] ^ k
  print c
  k = c

This

Code: Select all

k = c

should be this

Code: Select all

k = txt[i]

[Miyazawa]

In this code

Code: Select all

k = {unknown byte}
for (i = 0; i < len(txt); i++)
  c = txt[i] ^ k
  print c
  k = c

This

Code: Select all

k = c

should be this

Code: Select all

k = txt[i]

It is true! Thank you @aurquiel.
The algorithm is wrong so I have wasted a lot of time by doing this challange...
You should correct this...

[Hippo]

In this code

Code: Select all

k = {unknown byte}
for (i = 0; i < len(txt); i++)
  c = txt[i] ^ k
  print c
  k = c

This

Code: Select all

k = c

should be this

Code: Select all

k = txt[i]

It is true! Thank you @aurquiel.
The algorithm is wrong so I have wasted a lot of time by doing this challange...
You should correct this...

I don't think there is problem with the challenge.
What "a lot of time" roughly means in SI units?
Never mind, you have already solved the puzzle.