Specific to the security of passwords: hashing, entropy, cracking, resets, lockouts, etc.

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2
votes
2answers
98 views

Single-use password as the default authentication method?

The crazy password requirements (joke1, joke2) lead me to a situation where there is no way for me to memorize the passwords to the several sites that make those requirements. The result is that ...
4
votes
2answers
178 views

Is it safe to store a passphrase encrypted SSH key in git?

I have a bunch of servers that need to access somewhat sensitive data (passwords for ftps, api keys, etc). Currently I copy a plaintext file back-and-forth between the servers via ssh and encrypt all ...
2
votes
1answer
66 views

Securely storing passwords using PHP5

Starting note: After going through some articles and answers posted on SO related to storing secured passwords I'm still not sure whether my way of thinking is applicable to todays reality. I'm ...
2
votes
1answer
177 views

How to find passwords in memory (password managers)

I’m trying to figure out if password managers such as last pass store passwords in plain text (or hash values that can then be decrypted with the master password) in memory after a user logs into the ...
4
votes
3answers
502 views

Method to integrate Touch ID in iOS apps

With the recent announcement of Touch ID APIs for third party apps, I am wondering how can we leverage this feature to perform secure transaction ? I am looking for a method to use Touch ID in my ...
4
votes
1answer
49 views

Countermeasures for a family-member attack on a password reset procedure

Given an account reset procedures, there are usually some recovery questions, and in better implementations a link will be sent to confirm the password change via email or SMS. Therefore, the attacker ...
0
votes
0answers
7 views

Value of S and r in Fiat-Shamir Protocol [migrated]

In the book Cryptography and Network Security by Forouzan,in chapter 14, Fiat-Shamir protocol, its mentioned that two large prime numbers p and q are chosen and kept secret. However n=p*q is made ...
31
votes
5answers
6k views

If a web site shows me what my password was changed to, is it stored as plain text?

I just changed the password on a school-related web site. After completing the change successfully, the next page showed what the password was changed to. Can I conclude from this that the password ...
4
votes
2answers
197 views

Password strength metrics

In the question Source code as password I suggested using a combination of entropy and as @Lawtonfogle put it 'meatspace difficulty'. As suggested in the xkcd comic correct staple horse battery is a ...
1
vote
2answers
50 views

Do I need to set maximum characters length for password using bcrypt?

I using bcrypt to create a password hash and in the php documentation it says Caution: Using the PASSWORD_BCRYPT for the algo parameter, will result in the password parameter being truncated to ...
22
votes
10answers
4k views

Password Management within an Organisation

Within an organisation there are many passwords such as those for root accounts on servers, hosting accounts, router logins and other such things, that need to be kept track of. I know in some ...
15
votes
6answers
4k views

Managing website passwords for small team

I'm part of a small group of people who manage a website and the server it runs on. We have many accounts with third-party websites or services that multiple people on the team need to access. What is ...
3
votes
0answers
84 views

What is the most efficient password scheme in terms of entropy per convenience [closed]

Although the main points are right, but now six words are needed, which is both inconvenient to remember, and inconvenient to type. My question is, has then been any case studies on the most ...
0
votes
2answers
44 views

Full Disk Encryption, Single User System: User/Root Passwords required?

Are there any security issues of having no (or weak) passwords for user and root account on a single user system with full disk encryption (except boot partition)? Assuming no SSH server is running, ...
2
votes
1answer
56 views

Why use a password manager to protect browser logons when e-mail client is neglected?

Friends use password managers like lastpass or dashlane which have plugins for the browser, but not for the email clients (thunderbird or livemail). But surely the email password is the Achilles heel ...
4
votes
3answers
265 views

Best way to store/retrieve sensitive key files?

We have our web servers running in AWS EC2. We have about 30 API Keys/passwords/etc (sensitive data) which is set in the environment for our app to use. Whenever we deploy, we start a new server ...
1
vote
1answer
56 views

All UTF-8 characters for generated passwords

Why do a lot of password generators don't generate strong passwords including chinese, arabian...-characters? All generators I saw, also the included one in my password manager keepass, just output ...
4
votes
2answers
267 views

Should email verification be followed by password-based login? Why?

[This is a duplicate, considered off-topic at http://stackoverflow.com/questions/26564992/should-email-verification-be-followed-by-password-based-login-why] A typical account creation process seems ...
7
votes
2answers
1k views

When taking ownership of a TPM in Windows 7, how is the SRK derived from the password?

When you take ownership of a TPM in Windows 7 you encounter a screen like this: Based on this document, it is my understanding that completing this dialog box somehow results in the generation of ...
0
votes
2answers
96 views

Can I save passwords in my app securely and retrieve them without asking for a master password? [closed]

I need to save some passwords used on my app, so the user doesn't have to input them so often. I'm trying to understand how this is done. I imagine to keep them safe they should be encrypted however ...
3
votes
3answers
129 views

Is it a good idea to use non-Latin Unicode characters in a password?

I've heard many suggestions as to what makes a good password (hard to guess, not a dictionary word or permutation thereof, at least a certain length, etc.) so that it cannot be cracked in a realistic ...
26
votes
4answers
3k views

Is it safe to store a password hash history for preventing user to keep same password repeatedly in some cases?

I am developing an application in PHP and it uses bcrypt encryption to store passwords. I want to keep the history of hashes whenever the user changes the password. By doing this I want to stop the ...
-1
votes
2answers
111 views

SHA256 to text or MD5

I want to decrypt a sha256 to text. Is there a way other than bruteforcing to decrypt sha256? Like if I convert that SHA256 to MD5 and then try decrypting?I know its hard and the possible way for ...
-2
votes
0answers
18 views

Hydra giving false negative passwords [duplicate]

i used the hydra gui on myself and put my password in the wordlist to see if it worked and it came back no passwords found I did this 2 more times same thing I figured I did something wrong so I ...
2
votes
1answer
69 views

How to implement application-specific passwords using strong hashes?

I am implementing a service where application-specific passwords seem a good choice to improve security. A question on why and when they might make sense has already been discussed here Google ...
2
votes
0answers
51 views

Disallowing Similar Passwords [duplicate]

Upfront, I want to clarify that I am not a professional cryptographer, I am more curious about playing with the math and science behind it, and also want to improve my habits with my own personal and ...
1
vote
5answers
595 views

Authenticate user without knowing their password

I'm working on a project where each each user will have a public/private RSA key-pair. Users will be able to send encrypted messages to each other using the each target user's public key so that only ...
1
vote
0answers
37 views

Hashcat Turkish character problem [closed]

I'm using cudahashcat, it haven't special chars like "öçşĞÜ" in standart charsets. I defined charsets with windows-1254 and other encoding types(and -1 öÖçÇğĞşŞüÜıİ?a parameter), i tried but they ...
1
vote
2answers
187 views

Is SpiderOak truly “zero-knowledge”?

I've recently changed SpiderOak password on computer A. Because I have SpiderOak installed on computer B as well, I thought I will have to update the password on it so the application can connect to ...
2
votes
1answer
69 views

Do I have an SSH password?

I have an Ubuntu server hosted on DigitalOcean, I have been using SSH keys since the very beginning. (You can chose for it to be setup before the server instance has even been created). So I have ...
5
votes
2answers
219 views

ProtonMail security concerns

This TED talk brought me here. First of all, to those who created ProtonMail: Nice job!!. Regardless of what people say, it's definitely a big step forward from tradition options like Hotmail, Gmail ...
2
votes
1answer
161 views

Trusted Platform Module (TPM) secure password

I'm trying to set secure Trusted Platform Module (TPM) passwords on a network and would like to set it to the maximum length possible. How long can the TPM's password be? Is it limited by bits or by ...
-4
votes
1answer
40 views

What is the most secure way to protect a custom CMS from infiltration? [closed]

I have a custom CMS with a randomly generated ASCII 100-character string from this site for both my username/password. I also have this following sha512 encryption system, which was created by ...
2
votes
1answer
50 views

Is it safe to signup multiple applications with facebook?

Putting all eggs in one basket.. Is it safe to sign-up on different applications with facebook or such similar platforms, linkedin, twitter etc?
1
vote
2answers
52 views

Password strength in Wordpress Network

Very similar to this question at Wordpress Development, but intentionally asked here. A password, that contains: at least one capital letter, at least one small letter, at least one number and at ...
0
votes
2answers
106 views

Is my hashing function good enough

Is there an obvious flaw with this hashing function (written in PHP)? function hash($password) { sleep(1); // Make hashing slow $hash = ""; $iterations = strlen($password); for ( $i = 0; $i ...
1
vote
1answer
229 views

How are “worst passwords” lists made?

I don't understand how it's possible to create a list of the worst passwords used if they're (allegedly) encrypted? Are they collected anonymously before saving in the database especially for this ...
6
votes
3answers
65k views

Wordlists on Kali Linux?

I notice that in /usr/share/wordlists in Kali Linux (former Backtrack) there are some lists. Are they used to bruteforce something? Is there specific list for specific kind of attacks?
0
votes
2answers
86 views

Need some docs that say we shouldn't upper the string when saving it as a password [closed]

I'm trying to find on the Internet some manual, guide or policy secure about applications should not convert lower string to upper string to store as password I mean, don't make ...
2
votes
1answer
69 views

What is a key-hardened hash?

I've seen the term 'key hardened hash' used to describe a recommended way to tighten up password hashing. What does this mean? Can it just mean to use a pepper?
17
votes
6answers
2k views

What does “random” mean in the context of password creation?

Disclaimer: as you will see from my question I'm a total outsider in this subject, just very curious. I was wondering how easy it would be to crack a password-protected RAR5 file, and I found many ...
3
votes
3answers
142 views

Acceptably secure solution for users to log in with a short unique code only (no username)

I am creating a website whereby users are given an account by invitation only, and are sent a unique code by post. Users can then log in (at least the first time) by entering the code only. The goal ...
34
votes
11answers
25k views

Are password-protected ZIP files secure?

Following my answer. If I can list contents of password-protected ZIP file, check the file types of each stored file and even replace it with another one, without actually knowing the password, then ...
-2
votes
1answer
235 views

What are common problems that reveal PHP code? [closed]

What is the best method for securing PHP scripts that contain database passwords? From what I've read, PHP can be revealed when an error occurs and is not caught. Is there any way to reveal PHP by ...
0
votes
1answer
117 views

What kind of backdoor can be made after hacking wi-fi? [closed]

I'm interested to know if A hacks B's wifi password, what can A do to gain persistent access to the router even after B changes the wifi password? Secondly, how can we detect the backdoor and patch ...
20
votes
4answers
2k views

Recommended policy on password complexity

Is there any research on how how a password complexity policy can increase or decrease the quality of passwords? If you don't have any requirements on the password then probably 90% of users will use ...
6
votes
3answers
1k views

SSH key auth, but still need password for sudo?

SSH with public-private key authentication comes enabled by default with most Linux distributions. This is great because when I create accounts for remote users I don't have to email them sensitive ...
4
votes
2answers
341 views

LastPass login security

If LastPass does not store your master password, then how can you login to use their web app? Surely you must type it in, it is sent over using SSL, and then salted/hashed on the server-side, and ...
5
votes
3answers
1k views

Is GPG suitable as part of a password manager and generator?

I assume that GPG is very strong to crack, guess, etc. Since I have confidence in GPG, would it be appropriate to use my GPG key as the master key for a password manager or generator?
1
vote
3answers
132 views

How to transform an hash into a usable password?

I was reading about PwdHash and it inspired me to create a little project where you input a master password and an easy to remember alias into a password hash, like bcrypt, and then you get an hash. ...