How to dynamically generate the hash value of a file while it gets downloaded from any website? Announcing the arrival of Valued Associate #679: Cesar Manara Planned maintenance scheduled April 23, 2019 at 00:00UTC (8:00pm US/Eastern)Cryptographic Security of Dynamically Generated, Non-Random SaltsProperties for cryptographic hash functions (preimage, second preimage and collision resistant)Is a file hash checking system 100% secure and non-bypassable/fakable?Search on hashed dataHow SplashData knows about Worst Passwords used by users annuallyVerify CDN javascript's integrityIs it insecure to hash multiples times?Is This DIY Password Authentication Scheme Acceptable?Salted password + hash - is it really useful?If hash values are same, they lessen security. Why?
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How to dynamically generate the hash value of a file while it gets downloaded from any website?
Announcing the arrival of Valued Associate #679: Cesar Manara
Planned maintenance scheduled April 23, 2019 at 00:00UTC (8:00pm US/Eastern)Cryptographic Security of Dynamically Generated, Non-Random SaltsProperties for cryptographic hash functions (preimage, second preimage and collision resistant)Is a file hash checking system 100% secure and non-bypassable/fakable?Search on hashed dataHow SplashData knows about Worst Passwords used by users annuallyVerify CDN javascript's integrityIs it insecure to hash multiples times?Is This DIY Password Authentication Scheme Acceptable?Salted password + hash - is it really useful?If hash values are same, they lessen security. Why?
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I've tried generating the hash value of a file that is trying to get downloaded and compared it against the list of hash values, and if there is a match then it doesn't get downloaded.Here i have manually given the details of websites url and the file that needs to be downloaded. Now i need this to be happen dynamically i.e whenever a file from any website is trying to get downloaded then its hash value should be generated and if it matches with the list of hash values available then it shouldn't get downloaded otherwise it can download.I also have idea of injecting a plugin on to the browser where this functionality is dynamically executed. But I don't know if the this workout or not.
I hope you understood my problem statement and I request you to help me in solving it.
hash
asked Apr 14 at 10:05
Snehitha GaddamSnehitha Gaddam
112
New contributor
Snehitha Gaddam is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I've tried generating the hash value of a file that is trying to get downloaded and compared it against the list of hash values, and if there is a match then it doesn't get downloaded.Here i have manually given the details of websites url and the file that needs to be downloaded. Now i need this to be happen dynamically i.e whenever a file from any website is trying to get downloaded then its hash value should be generated and if it matches with the list of hash values available then it shouldn't get downloaded otherwise it can download.I also have idea of injecting a plugin on to the browser where this functionality is dynamically executed. But I don't know if the this workout or not.
I hope you understood my problem statement and I request you to help me in solving it.
hash
asked Apr 14 at 10:05
Snehitha GaddamSnehitha Gaddam
112
New contributor
Snehitha Gaddam is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Just to be certain: you want to blacklist specific downloads on a file-by-file basis? This seems like an incredibly laborious process.
– Johnny
Apr 14 at 10:11
15
You have to download the file first to calculate the hash value. And which attacks will this discourage? Hash verification is fine for verifying that you didn't get a corrupt download, but less fine for verifying attacks, unless the hashes (or file) is signed by a trusted key.
– vidarlo
Apr 14 at 10:48
3
The definition of "downloaded" might matter here. If the data is transferred but not saved after checking the hash, then by some definition the download was prevented.
– gowenfawr
Apr 14 at 14:07
add a comment |
I've tried generating the hash value of a file that is trying to get downloaded and compared it against the list of hash values, and if there is a match then it doesn't get downloaded.Here i have manually given the details of websites url and the file that needs to be downloaded. Now i need this to be happen dynamically i.e whenever a file from any website is trying to get downloaded then its hash value should be generated and if it matches with the list of hash values available then it shouldn't get downloaded otherwise it can download.I also have idea of injecting a plugin on to the browser where this functionality is dynamically executed. But I don't know if the this workout or not.
I hope you understood my problem statement and I request you to help me in solving it.
hash
asked Apr 14 at 10:05
Snehitha GaddamSnehitha Gaddam
112
New contributor
Snehitha Gaddam is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I've tried generating the hash value of a file that is trying to get downloaded and compared it against the list of hash values, and if there is a match then it doesn't get downloaded.Here i have manually given the details of websites url and the file that needs to be downloaded. Now i need this to be happen dynamically i.e whenever a file from any website is trying to get downloaded then its hash value should be generated and if it matches with the list of hash values available then it shouldn't get downloaded otherwise it can download.I also have idea of injecting a plugin on to the browser where this functionality is dynamically executed. But I don't know if the this workout or not.
I hope you understood my problem statement and I request you to help me in solving it.
hash
hash
asked Apr 14 at 10:05
Snehitha GaddamSnehitha Gaddam
112
New contributor
Snehitha Gaddam is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Apr 14 at 10:05
Snehitha GaddamSnehitha Gaddam
112
New contributor
Snehitha Gaddam is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited Apr 14 at 17:23
Snehitha Gaddam
asked Apr 14 at 10:05
Snehitha GaddamSnehitha Gaddam
112
New contributor
Snehitha Gaddam is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Apr 14 at 10:05
Snehitha GaddamSnehitha Gaddam
112
asked Apr 14 at 10:05
Snehitha GaddamSnehitha Gaddam
112
112
New contributor
Snehitha Gaddam is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Snehitha Gaddam is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Snehitha Gaddam is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Just to be certain: you want to blacklist specific downloads on a file-by-file basis? This seems like an incredibly laborious process.
– Johnny
Apr 14 at 10:11
15
You have to download the file first to calculate the hash value. And which attacks will this discourage? Hash verification is fine for verifying that you didn't get a corrupt download, but less fine for verifying attacks, unless the hashes (or file) is signed by a trusted key.
– vidarlo
Apr 14 at 10:48
3
The definition of "downloaded" might matter here. If the data is transferred but not saved after checking the hash, then by some definition the download was prevented.
– gowenfawr
Apr 14 at 14:07
add a comment |
Just to be certain: you want to blacklist specific downloads on a file-by-file basis? This seems like an incredibly laborious process.
– Johnny
Apr 14 at 10:11
15
You have to download the file first to calculate the hash value. And which attacks will this discourage? Hash verification is fine for verifying that you didn't get a corrupt download, but less fine for verifying attacks, unless the hashes (or file) is signed by a trusted key.
– vidarlo
Apr 14 at 10:48
3
The definition of "downloaded" might matter here. If the data is transferred but not saved after checking the hash, then by some definition the download was prevented.
– gowenfawr
Apr 14 at 14:07
Just to be certain: you want to blacklist specific downloads on a file-by-file basis? This seems like an incredibly laborious process.
– Johnny
Apr 14 at 10:11
Just to be certain: you want to blacklist specific downloads on a file-by-file basis? This seems like an incredibly laborious process.
– Johnny
Apr 14 at 10:11
15
15
You have to download the file first to calculate the hash value. And which attacks will this discourage? Hash verification is fine for verifying that you didn't get a corrupt download, but less fine for verifying attacks, unless the hashes (or file) is signed by a trusted key.
– vidarlo
Apr 14 at 10:48
You have to download the file first to calculate the hash value. And which attacks will this discourage? Hash verification is fine for verifying that you didn't get a corrupt download, but less fine for verifying attacks, unless the hashes (or file) is signed by a trusted key.
– vidarlo
Apr 14 at 10:48
3
3
The definition of "downloaded" might matter here. If the data is transferred but not saved after checking the hash, then by some definition the download was prevented.
– gowenfawr
Apr 14 at 14:07
The definition of "downloaded" might matter here. If the data is transferred but not saved after checking the hash, then by some definition the download was prevented.
– gowenfawr
Apr 14 at 14:07
add a comment |
1 Answer
1
active
oldest
votes
Agreed with vidarlo, this is impossible.
Ultimately, you'll need to download the file, in order to determine its hash. What you're asking is to determine the hash of a file before downloading it!
What is possible is a script that hashes each file in your downloads directory and then perform some action depending on the hash matching. The script could be scheduled to run every 10 minutes or so.
It's hard to make a recommendation, since we have no idea what it is you're trying to accomplish by blacklisting a specific file.
answered Apr 14 at 12:01
keithRozariokeithRozario
1,124213
Thank you keithRazario , I totally understood your solution. This is regarding my project named Formgrabbing malware analysis. The hashing technique is one of the prevention techniques I thought of using. Here I need not actually have the file of hash values which is signed by a trusted key. I just have to present my idea for demo purpose.
– Snehitha Gaddam
Apr 14 at 16:56
1
Executables on windows supports digital signatures. It's very commonly used. What will your scheme add? Who approves or disapproves files? Remember that a compiled executable is a complex beast that can behave differently dependent on the environment.
– vidarlo
Apr 14 at 17:34
I also have another concern with the solution i.e a file can be downloaded in any directory , it is not that it can download in only downloads directory. So how about taking the list latest files downloaded?
– Snehitha Gaddam
Apr 15 at 7:18
add a comment |
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1 Answer
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Agreed with vidarlo, this is impossible.
Ultimately, you'll need to download the file, in order to determine its hash. What you're asking is to determine the hash of a file before downloading it!
What is possible is a script that hashes each file in your downloads directory and then perform some action depending on the hash matching. The script could be scheduled to run every 10 minutes or so.
It's hard to make a recommendation, since we have no idea what it is you're trying to accomplish by blacklisting a specific file.
answered Apr 14 at 12:01
keithRozariokeithRozario
1,124213
Thank you keithRazario , I totally understood your solution. This is regarding my project named Formgrabbing malware analysis. The hashing technique is one of the prevention techniques I thought of using. Here I need not actually have the file of hash values which is signed by a trusted key. I just have to present my idea for demo purpose.
– Snehitha Gaddam
Apr 14 at 16:56
1
Executables on windows supports digital signatures. It's very commonly used. What will your scheme add? Who approves or disapproves files? Remember that a compiled executable is a complex beast that can behave differently dependent on the environment.
– vidarlo
Apr 14 at 17:34
I also have another concern with the solution i.e a file can be downloaded in any directory , it is not that it can download in only downloads directory. So how about taking the list latest files downloaded?
– Snehitha Gaddam
Apr 15 at 7:18
add a comment |
Agreed with vidarlo, this is impossible.
Ultimately, you'll need to download the file, in order to determine its hash. What you're asking is to determine the hash of a file before downloading it!
What is possible is a script that hashes each file in your downloads directory and then perform some action depending on the hash matching. The script could be scheduled to run every 10 minutes or so.
It's hard to make a recommendation, since we have no idea what it is you're trying to accomplish by blacklisting a specific file.
answered Apr 14 at 12:01
keithRozariokeithRozario
1,124213
Thank you keithRazario , I totally understood your solution. This is regarding my project named Formgrabbing malware analysis. The hashing technique is one of the prevention techniques I thought of using. Here I need not actually have the file of hash values which is signed by a trusted key. I just have to present my idea for demo purpose.
– Snehitha Gaddam
Apr 14 at 16:56
1
Executables on windows supports digital signatures. It's very commonly used. What will your scheme add? Who approves or disapproves files? Remember that a compiled executable is a complex beast that can behave differently dependent on the environment.
– vidarlo
Apr 14 at 17:34
I also have another concern with the solution i.e a file can be downloaded in any directory , it is not that it can download in only downloads directory. So how about taking the list latest files downloaded?
– Snehitha Gaddam
Apr 15 at 7:18
add a comment |
Agreed with vidarlo, this is impossible.
Ultimately, you'll need to download the file, in order to determine its hash. What you're asking is to determine the hash of a file before downloading it!
What is possible is a script that hashes each file in your downloads directory and then perform some action depending on the hash matching. The script could be scheduled to run every 10 minutes or so.
It's hard to make a recommendation, since we have no idea what it is you're trying to accomplish by blacklisting a specific file.
answered Apr 14 at 12:01
keithRozariokeithRozario
1,124213
Agreed with vidarlo, this is impossible.
Ultimately, you'll need to download the file, in order to determine its hash. What you're asking is to determine the hash of a file before downloading it!
What is possible is a script that hashes each file in your downloads directory and then perform some action depending on the hash matching. The script could be scheduled to run every 10 minutes or so.
It's hard to make a recommendation, since we have no idea what it is you're trying to accomplish by blacklisting a specific file.
answered Apr 14 at 12:01
keithRozariokeithRozario
1,124213
answered Apr 14 at 12:01
keithRozariokeithRozario
1,124213
answered Apr 14 at 12:01
keithRozariokeithRozario
1,124213
answered Apr 14 at 12:01
keithRozariokeithRozario
1,124213
1,124213
Thank you keithRazario , I totally understood your solution. This is regarding my project named Formgrabbing malware analysis. The hashing technique is one of the prevention techniques I thought of using. Here I need not actually have the file of hash values which is signed by a trusted key. I just have to present my idea for demo purpose.
– Snehitha Gaddam
Apr 14 at 16:56
1
Executables on windows supports digital signatures. It's very commonly used. What will your scheme add? Who approves or disapproves files? Remember that a compiled executable is a complex beast that can behave differently dependent on the environment.
– vidarlo
Apr 14 at 17:34
I also have another concern with the solution i.e a file can be downloaded in any directory , it is not that it can download in only downloads directory. So how about taking the list latest files downloaded?
– Snehitha Gaddam
Apr 15 at 7:18
add a comment |
Thank you keithRazario , I totally understood your solution. This is regarding my project named Formgrabbing malware analysis. The hashing technique is one of the prevention techniques I thought of using. Here I need not actually have the file of hash values which is signed by a trusted key. I just have to present my idea for demo purpose.
– Snehitha Gaddam
Apr 14 at 16:56
1
Executables on windows supports digital signatures. It's very commonly used. What will your scheme add? Who approves or disapproves files? Remember that a compiled executable is a complex beast that can behave differently dependent on the environment.
– vidarlo
Apr 14 at 17:34
I also have another concern with the solution i.e a file can be downloaded in any directory , it is not that it can download in only downloads directory. So how about taking the list latest files downloaded?
– Snehitha Gaddam
Apr 15 at 7:18
Thank you keithRazario , I totally understood your solution. This is regarding my project named Formgrabbing malware analysis. The hashing technique is one of the prevention techniques I thought of using. Here I need not actually have the file of hash values which is signed by a trusted key. I just have to present my idea for demo purpose.
– Snehitha Gaddam
Apr 14 at 16:56
Thank you keithRazario , I totally understood your solution. This is regarding my project named Formgrabbing malware analysis. The hashing technique is one of the prevention techniques I thought of using. Here I need not actually have the file of hash values which is signed by a trusted key. I just have to present my idea for demo purpose.
– Snehitha Gaddam
Apr 14 at 16:56
1
1
Executables on windows supports digital signatures. It's very commonly used. What will your scheme add? Who approves or disapproves files? Remember that a compiled executable is a complex beast that can behave differently dependent on the environment.
– vidarlo
Apr 14 at 17:34
Executables on windows supports digital signatures. It's very commonly used. What will your scheme add? Who approves or disapproves files? Remember that a compiled executable is a complex beast that can behave differently dependent on the environment.
– vidarlo
Apr 14 at 17:34
I also have another concern with the solution i.e a file can be downloaded in any directory , it is not that it can download in only downloads directory. So how about taking the list latest files downloaded?
– Snehitha Gaddam
Apr 15 at 7:18
I also have another concern with the solution i.e a file can be downloaded in any directory , it is not that it can download in only downloads directory. So how about taking the list latest files downloaded?
– Snehitha Gaddam
Apr 15 at 7:18
add a comment |
Snehitha Gaddam is a new contributor. Be nice, and check out our Code of Conduct.
Snehitha Gaddam is a new contributor. Be nice, and check out our Code of Conduct.
Snehitha Gaddam is a new contributor. Be nice, and check out our Code of Conduct.
Snehitha Gaddam is a new contributor. Be nice, and check out our Code of Conduct.
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Just to be certain: you want to blacklist specific downloads on a file-by-file basis? This seems like an incredibly laborious process.
– Johnny
Apr 14 at 10:11
15
You have to download the file first to calculate the hash value. And which attacks will this discourage? Hash verification is fine for verifying that you didn't get a corrupt download, but less fine for verifying attacks, unless the hashes (or file) is signed by a trusted key.
– vidarlo
Apr 14 at 10:48
3
The definition of "downloaded" might matter here. If the data is transferred but not saved after checking the hash, then by some definition the download was prevented.
– gowenfawr
Apr 14 at 14:07