Does server stores my previos passwords?
When I change my password on some web server like email, cloud, social network and try to use my previous password, server denied it with message "Don't use your previous passwords".
- Does it mean that server stores my my previous passwords? How does it secure?
passwords
asked 3 hours ago
sluge
406144
add a comment |
When I change my password on some web server like email, cloud, social network and try to use my previous password, server denied it with message "Don't use your previous passwords".
- Does it mean that server stores my my previous passwords? How does it secure?
passwords
asked 3 hours ago
sluge
406144
add a comment |
When I change my password on some web server like email, cloud, social network and try to use my previous password, server denied it with message "Don't use your previous passwords".
- Does it mean that server stores my my previous passwords? How does it secure?
passwords
asked 3 hours ago
sluge
406144
When I change my password on some web server like email, cloud, social network and try to use my previous password, server denied it with message "Don't use your previous passwords".
- Does it mean that server stores my my previous passwords? How does it secure?
passwords
passwords
asked 3 hours ago
sluge
406144
asked 3 hours ago
sluge
406144
asked 3 hours ago
sluge
406144
asked 3 hours ago
sluge
406144
asked 3 hours ago
sluge
406144
406144
add a comment |
add a comment |
1 Answer
1
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oldest
votes
Hash functions deterministic functions, same input results always the same output. They can store the previous hash values of your old passwords and compare them with your new proposed password's hash. To achieve this, they also need to store at least the salt values, too. This means the salt and other parameters has to be the same for you in this site.
From here, without the server side code, we cannot say more than like this.
answered 3 hours ago
kelalaka
6351615
1
Especially if salt is a user name or user's email.
– sluge
2 hours ago
Don't they need to store the salt value anyway to authenticate you? Basically, if the server had enough information to run a functionis_password_correct()earlier (and it needed to, to log you in), then it can still save all the information required to run it after you have changed your password.
– Federico Poloni
15 mins ago
1
Also, note that if the server answers "your new password is too similar to the password you had 1 month ago" instead, then it means that they have stored it in plain text, or that they have done something almost as insecure as storing it in plain text. Run, don't walk.
– Federico Poloni
12 mins ago
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Hash functions deterministic functions, same input results always the same output. They can store the previous hash values of your old passwords and compare them with your new proposed password's hash. To achieve this, they also need to store at least the salt values, too. This means the salt and other parameters has to be the same for you in this site.
From here, without the server side code, we cannot say more than like this.
answered 3 hours ago
kelalaka
6351615
1
Especially if salt is a user name or user's email.
– sluge
2 hours ago
Don't they need to store the salt value anyway to authenticate you? Basically, if the server had enough information to run a functionis_password_correct()earlier (and it needed to, to log you in), then it can still save all the information required to run it after you have changed your password.
– Federico Poloni
15 mins ago
1
Also, note that if the server answers "your new password is too similar to the password you had 1 month ago" instead, then it means that they have stored it in plain text, or that they have done something almost as insecure as storing it in plain text. Run, don't walk.
– Federico Poloni
12 mins ago
add a comment |
Hash functions deterministic functions, same input results always the same output. They can store the previous hash values of your old passwords and compare them with your new proposed password's hash. To achieve this, they also need to store at least the salt values, too. This means the salt and other parameters has to be the same for you in this site.
From here, without the server side code, we cannot say more than like this.
answered 3 hours ago
kelalaka
6351615
1
Especially if salt is a user name or user's email.
– sluge
2 hours ago
Don't they need to store the salt value anyway to authenticate you? Basically, if the server had enough information to run a functionis_password_correct()earlier (and it needed to, to log you in), then it can still save all the information required to run it after you have changed your password.
– Federico Poloni
15 mins ago
1
Also, note that if the server answers "your new password is too similar to the password you had 1 month ago" instead, then it means that they have stored it in plain text, or that they have done something almost as insecure as storing it in plain text. Run, don't walk.
– Federico Poloni
12 mins ago
add a comment |
Hash functions deterministic functions, same input results always the same output. They can store the previous hash values of your old passwords and compare them with your new proposed password's hash. To achieve this, they also need to store at least the salt values, too. This means the salt and other parameters has to be the same for you in this site.
From here, without the server side code, we cannot say more than like this.
answered 3 hours ago
kelalaka
6351615
Hash functions deterministic functions, same input results always the same output. They can store the previous hash values of your old passwords and compare them with your new proposed password's hash. To achieve this, they also need to store at least the salt values, too. This means the salt and other parameters has to be the same for you in this site.
From here, without the server side code, we cannot say more than like this.
answered 3 hours ago
kelalaka
6351615
edited 2 hours ago
answered 3 hours ago
kelalaka
6351615
answered 3 hours ago
kelalaka
6351615
answered 3 hours ago
kelalaka
6351615
6351615
1
Especially if salt is a user name or user's email.
– sluge
2 hours ago
Don't they need to store the salt value anyway to authenticate you? Basically, if the server had enough information to run a functionis_password_correct()earlier (and it needed to, to log you in), then it can still save all the information required to run it after you have changed your password.
– Federico Poloni
15 mins ago
1
Also, note that if the server answers "your new password is too similar to the password you had 1 month ago" instead, then it means that they have stored it in plain text, or that they have done something almost as insecure as storing it in plain text. Run, don't walk.
– Federico Poloni
12 mins ago
add a comment |
1
Especially if salt is a user name or user's email.
– sluge
2 hours ago
Don't they need to store the salt value anyway to authenticate you? Basically, if the server had enough information to run a functionis_password_correct()earlier (and it needed to, to log you in), then it can still save all the information required to run it after you have changed your password.
– Federico Poloni
15 mins ago
1
Also, note that if the server answers "your new password is too similar to the password you had 1 month ago" instead, then it means that they have stored it in plain text, or that they have done something almost as insecure as storing it in plain text. Run, don't walk.
– Federico Poloni
12 mins ago
1
1
Especially if salt is a user name or user's email.
– sluge
2 hours ago
Especially if salt is a user name or user's email.
– sluge
2 hours ago
Don't they need to store the salt value anyway to authenticate you? Basically, if the server had enough information to run a function
is_password_correct() earlier (and it needed to, to log you in), then it can still save all the information required to run it after you have changed your password.– Federico Poloni
15 mins ago
Don't they need to store the salt value anyway to authenticate you? Basically, if the server had enough information to run a function
is_password_correct() earlier (and it needed to, to log you in), then it can still save all the information required to run it after you have changed your password.– Federico Poloni
15 mins ago
1
1
Also, note that if the server answers "your new password is too similar to the password you had 1 month ago" instead, then it means that they have stored it in plain text, or that they have done something almost as insecure as storing it in plain text. Run, don't walk.
– Federico Poloni
12 mins ago
Also, note that if the server answers "your new password is too similar to the password you had 1 month ago" instead, then it means that they have stored it in plain text, or that they have done something almost as insecure as storing it in plain text. Run, don't walk.
– Federico Poloni
12 mins ago
add a comment |
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