_raven's ende
| Download ende.zip, 1 kb (password: crackmes.de) Browse contents of ende.zip Only some sourcecode and a encrypted file this time. Write a bruteforce tool to decrypt the file (contains ONLY strings) or try to find a flaw in the algorithm. The key is not longer than 5 characters and contains only ones from this alphabet: '0123456789abcdefghijklmnopqrstuvwxyz'.
Difficulty: 2 - Needs a little brain (or luck) | RatingWaiting for at least 3 votes View profile of _raven » |
Solutions
Solution by lagalopex, published 26. may, 2010; download (2 kb), password: crackmes.de or browse.
lagalopex has not rated this crackme yet.
Discussion and comments
| redoC 22. May 2010 | file contains ONLY strings ... what characters? any from ASC(32) to ASC(126)? |
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| _ghandi_ 22. May 2010 | Yes, can you define exactly what type of string you mean please? It makes a big difference to bf design. |
| Xspider 22. May 2010 | @author: at first you said (contains ONLY strings) and then you said The key is not longer than 5 characters and contains only ones from this alphabet: '0123456789abcdefghijklmnopqrstuvwxyz'. this means that there are numbers too ?! |
| _raven Author 25. May 2010 | The decrypted file contains strings only. |
| _raven Author 25. May 2010 | Yes a-z, A-Z. Charset is ASCII. |
| redoC 25. May 2010 | surely a-z, A-Z ? no spaces or dots? |
| lagalopex 25. May 2010 | Just to be sure: key: len<=5 only a-z, 0-9 decrypted string: len=40 only a-z, A-Z No spaces or punctation, then why "stringS"? The sourcecode is the encryption, are you sure the algorithm is reversable? |
| BoRoV 25. May 2010 | the algorithm is not reversable, only brute |
| _raven Author 25. May 2010 | a-z, A-Z, space and punctation are possible of course, think of the tool 'strings' to find all strings in a binary file. |
| _ghandi_ 25. May 2010 | Increasing the keyspace with these extra characters makes it a longer bruteforce process. |
| lagalopex 25. May 2010 | Okay, I solved it ;) (Brute force, all solutions in ~3ms.) |
| Xspider 25. May 2010 | nice :) looking forward that solution :) |
| _raven Author 26. May 2010 | nice solution lagalopex! |
| _ghandi_ 26. May 2010 | nice solution legaloplex. |
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