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

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1answer
33 views

Password-less authentication in web apps - How safe it is?

I read a long time ago this article about how could work a Password-less Authentication System, which sounded to me like a great idea. I even built it in a small fun little application for fun. To ...
3
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0answers
15 views

Re-display password in registration form good or bad?

When a user tries to register and the data he submits are not right such as bad email, or weak password, we would display the registration page again to him with the data he just submitted along with ...
1
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1answer
45 views

Plain text password emailed back during registration

I would like to ask if the passwords in the database are not encrypted if during registration I am receiving plain text password with username.
1
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1answer
44 views

Has anyone used this ICLOAK USB device? [on hold]

Does anyone know about this ICLOAK USB device? Opinions or how well they work? I'm looking for a security solution when I'm using PCs where I work. Occasionally we have to log into to web sites, ...
11
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3answers
2k views

Why do some bank websites use passwords that are not case sensitive?

It was recently brought to my attention that a certain big bank website allows users to log in with passwords that are not case sensitive. After confirming this, I checked other websites I bank with ...
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0answers
11 views

What are alternate options for PBEWithMD5AndTripleDES with SecretKeyFactory.getInstance( ) for encrypting Image files? [on hold]

Are there any alternate options other than PBEWithMD5AndTripleDES. As we are aware MD5 is not considered secure enough a hashing method. My requirement is to implement Password Based Encryption (PBE) ...
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0answers
68 views

Decode Obfuscated Malicious PHP Code [on hold]

I found 3 php files in a htaccess-password-protected upload folder on my server: 1. default_folders.php 2. factory.php 3. HMAC.php Each of them contains a variable string, eg: <?php ...
2
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2answers
82 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 ...
2
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1answer
55 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 ...
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0answers
6 views

How to reset my password on Windows tablet [on hold]

Turned on my Samsung T700 after several months of not use (got iPad) and found myself totally locked out because I totally forgot my pin. I found some references online how to create a USB boot driver ...
4
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1answer
46 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 ...
2
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1answer
149 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 ...
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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 ...
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1answer
31 views

I want to know about all the specifications of a cell phone when it enters into particular area [on hold]

I want to produce a signal such that when a cell phone enters that area, I must get all the specifications of that device. Can I do it? Which signal is good?
43
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10answers
10k views

Why does the user pick the password?

Almost every web service I can imagine has the user pick the password. Why is this? Couldn't the system choose a better password? It doesn't have to be some complicated mess; see ...
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2answers
45 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 ...
0
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2answers
41 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, ...
3
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0answers
80 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 ...
2
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1answer
50 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 ...
1
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1answer
47 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
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2answers
185 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 ...
22
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6answers
4k views

Source code as password

Passwords with a mixture of letters, numbers, and special characters are sometimes hard to remember. Is it secure to instead use a small amount of memorable source code as a 'passphrase'? As an ...
2
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3answers
110 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 ...
0
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2answers
94 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 ...
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2answers
83 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 ...
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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
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1answer
62 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 ...
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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 ...
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0answers
34 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 ...
2
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1answer
67 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 ...
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1answer
28 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
46 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
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2answers
49 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 ...
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2answers
99 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 ...
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1answer
223 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 ...
26
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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 ...
5
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2answers
199 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 ...
30
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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 ...
0
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2answers
80 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 ...
1
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1answer
68 views

How is password information stored and used on Android accounts?

How difficult would it be for someone who stole your device to gain access to the username and password information stored under the Settings -> More -> Accounts section of an Android device? ...
0
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1answer
102 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 ...
3
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1answer
27 views

Password security when connecting to ldap with rails application

How do you store a username/password securely in a rails app when using it for many ldap searches? The connection in the app requires ldap_bind_authenticate(Net::LDAP.new, username, password) ...
17
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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 ...
1
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1answer
62 views

Password sharing with spouse or mate (bulk-change shared passwords (via cloud service))? [closed]

I've read on New Scientist magazine that in 80% of all cases when people in a relationship share a place where they live one of the spouses knows the other's password, thus making the question I am ...
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3answers
123 views

Trouble understand login vulnerabilities

I'm testing my own web page with the following vulnerabilities. #1: Form escapes ' to \' So if a user tries to enter the following information: username: 'or'1=1 password: m username will ...
0
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1answer
41 views

Framework behind password reset mechanism

I have always seen those "Forgot password" links from web sites that requires some form of user login. Can I get a deeper understanding of how this works? What tools/framework do I need to use because ...
1
vote
1answer
78 views

What is the safest way to encrypt a password that can be decrypted at a later time?

In a web app I'm building, I need to use Apple's AutoIngestion tool for iTunes Connect. In this tool it seems the only way to use it is to send a password in plain text. What would be the best ...
4
votes
3answers
297 views

SSH Public Key Authentication vs Username/password for API Access

I have a linux device that will be making periodic call to an API server, say everytime the system boots up. Everytime then it should authenticate itself and then do its thing. I can either store the ...
2
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0answers
25 views

sample/starter code to test for TRUSTe password requirements [closed]

Considering its a requirement for Truste certification I figure that the code to test for a password meeting Truste's password strength requirements has been written more than a few times. I was ...
2
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2answers
52 views

Does changing the default number of iterations in KeePass (or other encryption applications) increase security?

Inspired by this question about the difficulty of cracking a KeePass database, I'm wondering if changing the default number of iterations in an encryption application (e.g., KeePass) increases ...