for questions relating to the cracking of passwords and the practices to mitigate against passwords being cracked.

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-2
votes
2answers
34 views

Will storing a split of a hashed password into multiple db fields increase security? [duplicate]

I've been reading up on Password hashing, and it seems like there is alot of opinions on "What's right." I'm curious about the possibility of storing a split of a Hashed password in multiple user ...
-2
votes
3answers
60 views

Is there something other than “if” and “else”

There are many ways for protecting a password like using strong algorithms like SHA-512, using salts, encrypting the database where the password is stored, packing the license file with UPX etc and ...
0
votes
1answer
55 views

Encrypt password with salt

Can anyone explain why formula 1 is safer than formula 2?I don't get it even I get the answer. According to 2, it says as s is in plaintext form, the attacker can decrypt the password by (y.s). ...
1
vote
2answers
238 views

Is there a civilian friendly indicator of stored password safety?

As I understand it, by using one-way encryption we can protect stored password data in the event that they are stolen. Broadly speaking, password data can usually be cracked by guessing so the ...
0
votes
1answer
46 views

Use John the Ripper to permutate cases in one password?

I'm currently testing standard pentest stuff on a Windows XP SP3 VM. I managed to compromise it and saved the SAM file with the password hashes. I used ophcrack with the "fast and free" and "small and ...
0
votes
0answers
41 views

Passwordlist generation, permutations and long passwords

I was wondering what could be a way of generating a list where the passwords were like: CorrectHorseBatteryStaple BanjoTurtleNinjaHobo PizzaSurfMotherMetal etc... I already fiddled a little with ...
-4
votes
0answers
16 views

Dictionary List Generator [duplicate]

Is there a script/program that can be used to generate a dictionary to be used in a password crack attempt. I am putting together a capture-the-flag and want the players to use this tool to identify ...
32
votes
12answers
9k views

Is it acceptable practice to only increment a number when changing a password?

Note: I'm not asking about this password scheme is the best or not (of course it isn't); I'm asking about its theoretical or practical secureness relative to the optimal password scheme based on the ...
5
votes
2answers
109 views

What are the risks of sending sensitive documents that are on physical media and password protected via postal carrier using registered mail?

Background The company I work for is extremely risk averse when it comes to adopting the use of cloud services for improving business flows. We currently use a very famous search company's business ...
-1
votes
2answers
69 views

How does a dictionary attack use it's “words”?

Does it assemble/concatenate the dictionary elements into candidate passwords, or does it just use the dictionary elements/words as passwords (which sounds strange)? I'm wondering about "SmartKey ZIP ...
3
votes
5answers
525 views

How secure is changing or adding a single character in your passphrase?

I'd wager quite a many people are required to periodically change their passwords for certain applications or even at the office. I'd also wager that a large percentage of these people "change" their ...
0
votes
2answers
46 views

How to properly hash a key? big vs small digest

We have to roll (decommission) database access keys often, but it's important to know which key each system is using in order to avoid removing a key in use thus creating unavailability. We want each ...
4
votes
1answer
102 views

Spoofing an NTP server to allow bruteforce on any smartphone

We all know that smartphones (i'll take iPhone as an example) rely on SNTP/NTP servers to update a device's time and date. So, by creating an SNTP server that mimics Apple's server, we can actually ...
3
votes
1answer
65 views

Is it possible to remove the password on new generations of Lenovo X1?

I have lost the password for my setup. I set it up a few years ago and now I cannot recall it. The supervisor password is not stored in an EEPROM so the usual tricks do not work. I think it is in a ...
0
votes
2answers
2k views

How hard is it to hack into a webmail account with a strong 8 character password?

Assume the hacker starts with only your email address and he has high incentive to gain access. UPDATE: Also assume the password is unique (never used elsewhere) and it is NOT a guessable word like ...
3
votes
2answers
91 views

What scenario are 'extra' strong passwords and hashing algorithms actually protecting against?

Note: I completely understand the need for strong passwords & I understand that there is an issue of speed with hashing. I am just interested in better understanding the actual negative impact of ...
2
votes
0answers
25 views

The optimal settings of Winrtgen GIU

I'm working with Winrtgen GIU on windows, but I can't fix the right settings to create a rainbow table for a: password length=1-7 Charset=alpha numeric all space What are the ideal values to put in ...
3
votes
5answers
611 views

Why can passwords be used to encrypt data, but are less strong for authentication?

Encryption software is often password based. Even if the adversary gets your computer they can't get the data without knowing the password, and bruteforcing is infeasible. Websites use passwords to ...
2
votes
1answer
151 views

Recover password from .pfx file

I have an old Windows SmartClient application that is published with a signed certificate (a .pfx file). We want to extend the expiration date to more than one year. I've used a program called ...
24
votes
5answers
1k views

Would turning a Diceware phrase into a sentence decrease its security?

Diceware passphrase lengths are on the rise - up to six or seven words now. The old adage that passphrases are easier to remember may be true for shorter phrases, but six truly random words can be ...
0
votes
1answer
226 views

How long will it take to break a salted password?

Let's say that I have a system where all passwords must be 8 characters long and each character can be any 32 different values. All my passwords are hashed with a salt. I can test 64 passwords per ...
81
votes
10answers
9k views

Is there a threshold for a password so long it doesn't get any more secure or even becomes insecure?

I always hear "A long password is good, a longer password is better". But is there such a thing as a "Password is so long it is becoming unsafe" or "Password is long enough, making it longer won't ...
5
votes
1answer
2k views

What is “NAND mirroring”, the alleged technique that the FBI will use to crack the San Bernardino shooter's iPhone?

According to Ars Technica, Jonathan Zdziarski, a leading independent Apple iOS security researcher and forensics expert, has a theory about the FBI's newly discovered potential route into the ...
3
votes
0answers
57 views

Is it possible to use parallelism when computing a key derivation function for a single password/key?

Suppose I have an AES-256 encrypted file, and I want to derive the key using PBKDF2 and a given salt with a large number of rounds (say 1 million), but I'm limited by user tolerance for UI lag when ...
46
votes
7answers
9k views

How are GPUs used in brute force attacks?

I have read that GPUs can be used in brute force attacks? But how can this be done and is there a need for any other hardware devices (hard disks for instance)? Note: I'm more interested in web ...
3
votes
3answers
121 views

password cracking: time vs cost

I often see people refer to arguments like: A (hashed) password will be cracked in 1.000 years if you use a normal desktop computer, but if you use 100.000 computers (botnet) it will be cracked in ...
3
votes
3answers
162 views

Prevent password reusing across different sites

I'm generally against too strict or complex rules to accept passwords (rules like "It must contain at least one upper-case character, one number and one symbol" and things like that, see also XKCD ...
0
votes
2answers
193 views

Cracking a password Protected pdf file using John the ripper

What exactly happens after I provide the hash from the pdf file to John for cracking the password? Does John extract just the password hash from the file and work on it, or is there something else?
1
vote
2answers
67 views

Custom word list generation for a specific web domain

I am looking for a tool that generates a set of word lists based on the words it finds on the pages of a particular web domain. This question has an answer that generates permuted word lists starting ...
0
votes
1answer
83 views

Is Entropy all that matters in a Password? [duplicate]

My question is, is it more reliable having a password that is composed by words like FootballPractice more secure than using a password that has only 2 or 3 bits less, for example FootbalPractic , my ...
0
votes
1answer
48 views

How to speed-up data collecting of WEP AP for aircrack?

I'm using aireplay to collect some data from AP alongside with aircrack. Unfortunetlly, the proccess seems quite slow to me as I've reached 2000 in more than 20mins so far. What most affects the speed ...
3
votes
6answers
218 views

How secure is this process for creating passwords?

I've been research into how to be as secure as possible when it comes to password security for online services and websites. Obviously there are some big no no's like using dictionary words, using the ...
1
vote
2answers
55 views

JTR is not cracking XP SAM password(s), why?

I was trying the following commands john --format=LM xpPassword.txt john xpPassword.txt to crack the following hash: xpPassword.txt ...
6
votes
3answers
636 views

Encrypted password inside compressed archive

File compression utilities like Winrar or ZIP or 7zip encrypt the password and store it inside the archive. How safe is that? I mean you are giving away the archive with the password inside,it's not ...
1
vote
1answer
131 views

How to optimize cracking speed with Reaver

When testing network security with Reaver in order to find out WPS, what parameters do you usually use with respect to cracking speed? I've chosen for TP-LINK Archer C20i AC750 Dual Band a delay of ...
1
vote
1answer
93 views

How much more difficult does it become to crack a password when appending a 5-digit pin?

I have a quick question regarding password cracking. Lets say you append a 5 digit pin on the end of your password. An example would be instead of a password of "password" it would be ...
1
vote
1answer
91 views

Generate John the Ripper rule

This question asks for pointers about generating JtR rulesets, but the OP states I understand how to use it to make various permutations from a given wordlist Could someone please explain that? ...
1
vote
2answers
123 views

Is it a good idea to combine words from different languages to increase a password's strength? [duplicate]

I was thinking of a way to generate a password that is easy to remember, but hard to crack, like the famous "correct horse battery staple" suggested by XKCD, also discussed here, and I've realized ...
1
vote
1answer
717 views

John The Ripper Unknown ciphertext format name requested

I wanted to crack my windows xp passwords contained in the SAM file with john the ripper, this file contains hashed passwords with NTLM algorithm, but when i use this command to specify the hashing ...
0
votes
1answer
56 views

show previously hacked passwords with John The Ripper

I tried to crack my windows passwords on the SAM file with john the ripper, it worked just fine, and it shows me the password. But when i try to hack the same file again, john just tells me : Loaded ...
0
votes
1answer
326 views

samdump2 Error reading ControlSet: _RegOpenKey

I copied both SAM and SYSTEM files from my Windows7 OS, and then used this command to read the content of the SAM file samdump2 SAM SYSTEM > mdp_chiffres.txt, but i'm getting this error Error ...
1
vote
1answer
300 views

Law enforcement cracked my phone?

Police took my android phone a few months ago. It was encrypted and had the 10 max tries destruction thing set on. I noticed that yesterday the device disappeared from my android device manager. ...
41
votes
7answers
5k views

Are partially typed passwords a potential security risk?

I just sat down at my work computer and began to unlock it by typing in my password, I got 6 of the 8 characters in and decided I wanted coffee and walked away to get it. I came back, realized I left ...
5
votes
1answer
142 views

Can posting “howsecureismypassword” results be a security risk?

Say that someone asked how secure my password is, if I give them the https://howsecureismypassword.net/ results of it, (especially if I disable the named numbers mode,) can that person brute force ...
0
votes
3answers
79 views

How to use password salt the right way [duplicate]

I understand the basic idea of password salts. You generate a 'random' string of data prepend this data to a user password store password and salt (salt maybe even in 'clear' form) Like in the ...
0
votes
1answer
26 views

Alternative to retrieve zip crypted content to brute force [closed]

I ended up a few years ago ( maybe 3) to crypt some video on my usb( in order if I loose the device) the material not to be accesible. Hoewer it is not possible for me now to ...
2
votes
0answers
123 views

Has password strength been an *actual* problem in a professional context? [closed]

Among the more security savvy community (very much including security.stackexchange) there is an ongoing discussion about the strength of different password policies. Examples include the ...
5
votes
1answer
260 views

Blocking Chinese IP addresses

I recently checked one of my servers' auth.log file and noticed some very suspicious activity. I recently shut down my server's ssh daemon, so the logs end on Jan 22, but what I noticed after ...
0
votes
1answer
219 views

John The Ripper 'No password hashes loaded'

Please forgive the newbiew question, but we all have to start somewhere, right? Following reading this excellent book, I am trying to learn John. I've been through the FAQ and this tutorial, but am ...
0
votes
1answer
75 views

Can anyone help me build a combo file suitable for my problem? [closed]

I have a router model C1000A company: CenturyLink Actiontec I bought it through eBay, my problem is that I can not connect to the Settings page because I do not have the admin password (the password ...