Questions tagged [salt]
A salt is a random addition to a password to make the hashed password less susceptible to a lookup table attack
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How should we apply the salt to the password? [duplicate]
According to Wikipedia:
A rainbow table is ineffective against one-way hashes that include large salts. For example, consider a password hash that is generated using the following function (where "|...
2
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2answers
102 views
Am I using RfcDeriveBytes correctly, when the salt I'm providing it contains the password?
I'm using Rfc2898DeriveBytes in my application to encrypt a password with a randomly generated salt, and with a set iterator count for slowness.
Before, I just grabbed the generated salt and put it ...
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3answers
145 views
Anonymizing IP addresses using (sha) hashes; how to circumvent rainbow table attacks?
Under GDPR, IP addresses are personal data. I have no need to trace back IP to specific users, but I would like to limit downloads to one per IP.* I do not want to store plain IPs.
My first solution ...
22
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8answers
6k views
How can I re-use my password and still protect the password if it is exposed from one source?
I know that all servers should at least store my credentials as hash(password + salt) + salt, with a secure and well known hash function and a salt unique for me, generated from a secure and well ...
2
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1answer
105 views
is it safe to AES encrypt the RSA private key and storing it in the database
i'm building an app that really needs encryption of this type , my question is it safe to store the aes encrypted RSA key in the database ?
here is how i encrypt the key :
i generate a random 256 ...
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1answer
58 views
How to identify the right hash from a list of salts and pre-given password during authentication?
I apologize for being naive, but I only recently started learning about cryptography and how to go about the security online.
From what I've gathered, the safest-without-sacrificing-efficiency way ...
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0answers
60 views
How long will it take to crack a hashed random string
If I generate 128 bit, 512 bit and 1024 bit random strings using either:
A native rand() function (C, PHP, Python, etc)
OpenSSL random bytes
Hardware generated random number
And hash the random ...
0
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3answers
71 views
How to make the first request which used to create account safe? [duplicate]
To authorize user, our application defined below steps:
Send user email and password (plain text) through HTTPS.
When server received it, generate a salt to hash password and store it.
When user ...
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2answers
167 views
Letting client encrypt his/her data. How to ensure the client doesn't lose his/her private data?
I am designing a web service where the client is allowed to encrypt his own data on client-side software & then send it to our server, so they can be sure their data is private on our side. Then, ...
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0answers
54 views
LUKS mitigate brute force attacks even if salt parameter is know?
From What users should know about
Full Disk Encryption based on LUKS
In Linux world, LUKS implementations are based on cryptsetup and
dm-crypt. In order to mitigate the problem of brute ...
0
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0answers
23 views
Password Hashing - Where does the Salt gets stored [duplicate]
I have read that it is a best practice to store Hashed passwords using Hashing algorithms which uses Salt to protect from Rainbow table attack.
My question is- if i store the hashed password in my ...
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1answer
154 views
Do I need to use salt with api key hashing?
I will generate api keys. I plan to store their hashes instead of plain text. do i also need salt, similar to storing password?
AFAIK salt prevents rainbow table attack and those are more ...
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1answer
62 views
Password storage which avoids privileged insider attack
What are the standard password authentication protocols in client-server setting where authentication happens at the remote server? Is there any password/pin verification protocol which reveals zero ...
2
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1answer
218 views
Is hashing without a salt secure for random passwords? [duplicate]
I'm designing an API with token authentication.
I don't want to store tokens as plain text in the database, for the same reason user passwords are not stored as plain text: if the database gets ...
0
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0answers
28 views
Is a combination of user login and site domain a sensible salt? [duplicate]
Just out of curiosity (since I know the established password hashing libraries should provide "proper" random salts), would a combination of the user login and the respective site's domain (or a hash ...
0
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1answer
48 views
Secure Register - Login Portal [closed]
Im trying to create a secure portal for parents to view their sons or daughters information.
I would need to have a register page. Im having trouble with hashing and salting the password.
Then I ...
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2answers
753 views
Appending a secret (pepper) to Argon2 password hashes
I've read quite a bit of the StackExchange and HackerNews debates on the user of "peppers" in password hash security. There are a number of different implementations of the idea of a pepper, ranging ...
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3answers
196 views
Hash pepper in web application possible?
I have read a few articles and several question on here about hashing correctly.
While hashing, adding salt and especially pepper is primarily a server side use case, I am interested in the ...
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0answers
387 views
bcrypt.checkpw() returning true for different salt+hash
new user here. I've tried searching for an answer but I don't think I know the correct terms to search for. I've tried things like "bcrypt same password different hash" but can't find an answer to my ...
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2answers
656 views
How long does it take to compute hashes using the MD5 hash algorithm? [closed]
1) If one iteration of MD5 takes x seconds, is it safe to assume that n iterations of MD5 takes n * x seconds?
2) Will salted and unsalted versions of md5 hash algorithms take approximately the same ...
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1answer
2k views
hashcat - cracking a salted sha256
Given a SHA512 hash, a salt, and username I am trying to crack the hash using hashcat. Every example I've found used a hashfile as input, is there way to provide salt and hash via commandline without ...
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1answer
130 views
Best tool for cracking SHA-1s with unique pre and post salts? [closed]
I can't find a tool that supports cracking SHA-1s with different pre and post salts. Any suggestions?
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0answers
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Where do salts come from? [duplicate]
A salt can be a random value and length. The hash and the salt are stored in the database.
Is there a separate salt generator function used? Is it just a random generator?
Does it need to be a ...
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1answer
170 views
Does salted password hashes expose users with blank passwords?
Traditionally, a 'salted' hash of the password is stored along with the salt so there is no plaintext in the database and still be able to authenticate the password.
The salting process consists of ...
3
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2answers
224 views
BCrypt workfactor for salt?
From what I read here: How to securely hash passwords?, you're supposed to iterate the hashing. However in the implementation of BCrypt for .Net uses the workfactor (2^wf iterations) in the '...
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1answer
78 views
Recover SHA1-encoded email addresses
Say you have a list of SHA1 hashes which are all encoded with the same salt. All of these are email addresses and you know at least one combination of hash and email address.
Is it possible to use a ...
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0answers
2k views
How do I combine a salt and hash for John The Ripper? [duplicate]
I found a password hash
*61A2BD98DAD2A09749B6FC77A9578609D32518DD
I found a salt somewhere else.
How do I combine these to feed into John the Ripper?
When I run John on the hash (minus the *) John ...
0
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1answer
108 views
Implementing SRP without storing the salt anywhere
I am attempting to use SRP to verify clients when they authenticate with a webserver, so that the password is never sent over the wire.
Looking at the SRP procedure, when a client registers with the ...
3
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1answer
298 views
Difference in between salt and random padding in cryptography
I would like to know what is difference in between using salt and using "random padding" in cryptography. I am familiar with term salt when we use it with hashing. How does "random padding" differ ...
3
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3answers
580 views
How is a pepper used with salted passwords?
How is a pepper (a large constant number) used after a password has been salted with a salt by a hashing function such as bcrypt?
From Sybex CISSP Official Study Guide, 8th Edition (2018):
Adding ...
2
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1answer
121 views
Slow Hashing Without a Salt?
I'm trying to design a security scheme that involves a shared secret but isn't a traditional account password situation. The server would store a set of "keys", each of which has a blob of data ...
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4answers
518 views
Common format to send encrypted data + IV?
I have an app that receive data from third parties using various protocols: MQTT, HTTP, AMQP, ...
Some clients cannot use TLS (iot devices without TLS support), so we need to find some compact and ...
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1answer
589 views
Hash a secret API key with a random salt instead of sending sending it alone in REST API
Say, I have an internal https API endpoint used only by me being the admin.
In each each request I send a secret API key for authentication. And I'm fine with this solution.
curl -x PUT .......
-...
3
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4answers
1k views
Securing hashes of short enumerated values
The system manages and stores sensitive data of short strings.
Because the sensitive data is of an enumerated type with limited set of well known values, the attacker could easily iterate all the ...
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1answer
110 views
How to securely generate and store the salting for password hash? [duplicate]
Assume a client authenticates using the password, which includes hashing and salting. The hash values are stored in a remote database server.
Questions:
For the hash values stored in the database ...
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2answers
622 views
Generating salt for hash that occurs on server and client
Let's say I have an API call which is supposed to check if email address exists in the DB, without transmitting the actual email address.
For that purpose, I've decided to store SHA256 hash of the ...
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1answer
11k views
How can I use openssl to decrypt AES-encrypted data using the key and initialization vector?
I am attempting to follow the example in this question:
Where is the salt on the OpenSSL AES encryption?
but I'm having some trouble decrypting using the key and initialization vector.
When I ...
2
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1answer
569 views
Why has salt option been deprecated as of PHP 7.0.0?
http://php.net/manual/en/function.password-hash.php
Is that less secured ?
echo password_hash("rasmuslerdorf", PASSWORD_DEFAULT);
=> $2y$12$QjSH496pcT5CEbzjD/vtVeH03tfHKFy36d4J0Ltp3lRtee9HDxY3K
...
3
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3answers
206 views
Can one find the value of a “constant salt” if they can set the password and get the hash?
Saying we have an oracle that an attacker can use as many time as they want. The attacker can send a non-empty password to this Oracle. The Oracle hashes the password using sha256(password + pepper), ...
2
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1answer
400 views
How to store secret key used for hashing?
I am trying to figure out a secure way to store secret keys used in the hashing of social security numbers.
The idea is for de-identification of research subjects yet still permitting follow-ups ...
3
votes
2answers
179 views
Can hash collisions be eliminated by hashing twice? [duplicate]
Suppose I have a file verified.txt that has a certain hash X.
An attacker can form an impostor.txt that replicates the hash with different content, resulting in a collision for a given algorithm, and ...
0
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1answer
140 views
Using the user's GUID-id as a salt for Rfc2898DeriveBytes
I use the Rfc2898DeriveBytes for creating an AES key for protecting the user's data.
For the salt value I would like to use the user's id, which is a guid.
My understanding is, that the only drawback ...
2
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2answers
233 views
Does having a salted password hash make cracking an unsalted hash of the same password easier?
I've been asked to implement a system to prevent reusing passwords on the same account.
The most secure way I know to do this is to compare hashes of the password + a known salt. bcrypt.hash(sha256(...
10
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1answer
5k views
bcrypt no need to store salt?
I'm confused with bcrypt, I would think I would need to store my salt, and then compare my plain text password + salt to the hashed password, however from documentation it does not look like storing ...
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1answer
184 views
Should I store my encrypted password's salt and initialization vector as clear text?
I'm encrypting some file with AES-256-CBC, and I'm planning to store the cipher text in a json file, with something like:
{
"data": "0123456789ABCDEF...",
"salt": "00123ABCAABBCCDD...",
"...
2
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1answer
398 views
Encrypted data embedded in JPG and Other file types
This is some data found near the end of a JPG file:
18{8uck3y3$}
! 18{b4063c521f76545d8c94e999dd63f445d8c01cfc}
# 18{U2FsdGVkX19RJjdBbDB51ok1hkFXaB91NpZNoQjbVXYlMeMTaWRTdg==}?
Other files on the ...
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7answers
13k views
Is it safe/wise to store a salt in the same field as the hashed password?
In using Argon2 for hashing passwords in my application, I've noticed it generates a string like this (e.g. for password "rabbit"):
$argon2i$v=19$m=65536,t=3,p=1$YOtX2//7NoD/owm8RZ8llw==$...
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2answers
291 views
How to verify 2 hashed values with different salts originating from the same clear-text password?
I have a project where I need to do an account merge across two websites.
Some percentage of users have accounts on both sites (same email address). Rather than just assume that two accounts with ...
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1answer
41 views
Store hashes for a finite set of strings that would be extremely time consuming to reverse via table lookup but also allow grouping
Lets say I have finite set of strings (lets say half a billion). There can never be any other strings I would need to store other than these half a billion strings. The strings may be repeated in my ...
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0answers
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How to get desired output from salt? [closed]
If you wanted to get a specific output from php's $salt. function, how would you do this. By this I mean,
If you know $salt."some_value" gives you desired_value, how do you find that some_value, if ...
