John-users - faster DES-based tripcode cracking Date: Wed, 28 Dec 2011 19:03:35 +0400 From: Solar Designer To: [email protected], [email protected] Subject: faster DES-based tripcode cracking Hi, I've just turned the proof-of-concept tripcode support in JtR into something beyond a PoC. The john-1.7.9-fastrip-1.diff patch currently on the wiki and in the 1.7.9 download directory makes use of JtR's bitslice DES implementation, including its OpenMP parallelization (if enabled). (A prerequisite for this was buffering and grouping of candidate passwords by their DES-based crypt(3) salt as used in tripcodes. The patch implements such buffering and grouping as well.) I post this to john-users because I think the patch is suitable for end users. I also cross-post it to john-dev in case there are comments or/and questions on the source code changes. Please post your followup messages to one of these two lists as appropriate. One setting to experiment with is TRIPCODESCALE, which is currently set to 0x40 in the patch, but may be reasonably increased to 0x1000 (a lot more buffering, which has both pros and cons).
Here are some benchmarks. Non-OpenMP on E5420 (using one CPU core); Benchmarking: Tripcode DES 128/128 BS SSE2-16. DONE Raw: 2449K c/s real, 2449K c/s virtual OpenMP on 2xE5420 (8 cores): Benchmarking: Tripcode DES 128/128 BS SSE2-16. DONE Raw: 10706K c/s real, 1343K c/s virtual As you can see, there's still room for improvement as it relates to OpenMP scaling. Fl studio 12 crack download.
$./john -i=all8 pw Loaded 8 password hashes with no different salts (Tripcode DES 128/128 BS SSE2-16) micemice (Albright) guesses: 1 time: 0:00:00:02 c/s: 44384K trying: brunelbr - bobybrt1 guesses: 1 time: 0:00:00:05 c/s: 52560K trying: mairkbuc - mongond5 guesses: 1 time: 0:00:00:07 c/s: 55192K trying: sevope19 - sissol15 guesses: 1 time: 0:00:00:10 c/s: 57199K trying: pspienit - psptlq99 guesses: 1 time: 0:00:00:27 c/s: 60778K trying: solpaha. sornfee!
For comparison, clean 1.7.9 (PoC tripcode support) on the same machine: Benchmarking: Tripcode DES 48/64 4K. DONE Raw: 267008 c/s real, 267008 c/s virtual $./john -i=all8 pw Loaded 8 password hashes with no different salts (Tripcode DES 48/64 4K) guesses: 0 time: 0:00:00:02 c/s: 2641K trying: mcalas97 - mcalkell guesses: 0 time: 0:00:00:04 c/s: 2696K trying: menelsed - mene1702 micemice (Albright) guesses: 1 time: 0:00:00:07 c/s: 2660K trying: mortle19 - morderat guesses: 1 time: 0:00:00:27 c/s: 2477K trying: buccublo - buccue-F Alexander - Your e-mail address.
As a caveat though, I do a full backup daily of every one of my 35 systems I have at home and just added another 30TB NAS unit (my sixth one) to my system because I am going to increase my backups to a full backup every 8 hours with incremental backups hourly as a test before I implement this more frequent system at work. Registry key finder.
A post on the /g/ imageboard with the tripcode!PedIa.Dbk., using the key #S3hsEQ A tripcode is a means of that does not require registration. Tripcodes are most often used in -style or -style. A tripcode is a hashed password by which a person can be identified by others. A tripcode is the result of input to a on the message board server, usually entered in the same field as the name. Using the common 2channel format, name#tripcode when entered as a username becomes name!3GqYIJ3Obs when displayed in the post. Is the separator between name and tripcode; on some boards it is replaced with ◆. Readers of the board can identify postings made by the same user by comparing tripcodes.
If two people use the same user name, they can be told apart because they, presumably, don't know each other's passwords that generate the different tripcodes. This way, the names and passwords don't have to be stored in a. As many boards use the same algorithm, tripcodes are usually consistent. Contents. Description of the algorithm The tripcode function works as follows:. Convert the input to. Generate the as follows:.
Take the second and third characters of the string obtained by appending H. To the end of the input. Replace any characters not between. Replace any of the characters in:;?@ ^` with the corresponding character from ABCDEFGabcdef. Call the with the input and salt.
Return the last 10 characters. (compressional data harvest) Since this is merely a, actual implementations vary widely. Most noticeably, many implementations substitute various characters with their HTML entities. For example, 2channel translates, and ' to, and '. Other implementations also replace other characters, e.g. However, this behavior was likely due to a bug in the original implementation, and since each board has different behavior it should not be considered part of the algorithm. Further, some boards don't perform the Shift JIS conversion.
Lastly, as a historical note, the original implementation only used the last 8 characters, but this has been fully replaced by 10-character tripcodes. Secure tripcodes Tripcodes are not a very secure authentication method.
Since the of 2channel-style tripcodes is not very large (slightly larger than 2 56) some boards implement a secure tripcode along with normal tripcodes. In their case another hash is used that takes a second input (typically in the form of name##securetripcode or name#tripcode#securetripcode) and uses a secret stored on the server.
As this salt is secret and site specific one cannot use a pre-computed such as. One of the drawbacks of secure tripcodes is that they are specific to a single imageboard or discussion board.
Because of this, a user cannot verify his or her identity across multiple boards or websites unless each board happens to use the same secret salt as well as the same method of generating and displaying secure tripcodes. Coupled with the fact that it is fairly rare that a user goes through the trouble of discovering another user's tripcode string, many users opt to use normal tripcodes.
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