Is there a way to decrypt the hex string created by sha2 function.
Basically we created a hex string based on two columns of a dataframe.
Only something which is encrypted can be decrypted. SHA-2 is not an encryption algorithm, it is a Secure Hash Algorithm.
Related
We are using PBEWITHSHA256AND256BITAES-CBC-BC algorithm for encrypting data.
What is the role of SHA-256 here?
Most of the forums states that PBKDF2 is a key derivation function? Does that use any algorithm internally to convert digest the plain text?
What does salt mean in bcrypt hashing?
Can I retrieve plain text from salt and hash?
Is there any online websites or tools to decrypt bcrypt hash correctly?
Thank my dear freind.
The point of hashing is creating input => output transform that's hard to reverse.
The point of salting the input is to prevent identical inputs from getting the same output by adding some random portion to input sequence before hashing.
So no, you cannot retrieve plain text from salt and hash (other than brute forcing or exploiting, if any, vulnerability of bcrypt algorithm or it's implementation).
How can I Decrypt the code which is Encrypted by md5 method in PostgreSQL.
eg: md5("logesh") returns '82e05c4839aba7c637881489bec50dd1'
How can I decrypted this code.
You can't. MD5 isn't encryption. It's a one-way cryptographic hash function. With enough compute power and/or storage you can brute force md5 to figure out what the plaintext might have been but it's only one possible plaintext for that hash. It's designed to be both slow and difficult to reverse, and impossible to reverse 1:1. There are known MD5 collisions.
PostgreSQL's use of "encrypt" in WITH ENCRYPTED PASSWORD is somewhat incorrect, it should really be WITH HASHED PASSWORD. But too late to change it now.
If you want encryption look into pgcrypto which offers AES-128 routines, etc. Or do your encryption and decryption client-side where key exposure in logs, pg_stat_statements etc isn't such a concern.
Recently I inherit an legacy source code where previous developer use the 128 Bits AES encryption with a 20 bytes key.
We cannot find a counter part implementation in other platform(Where we cannot decrypt the encrypted string using other platform's AES library), is it possible to expose the internal logic for how the 20 bytes key can be converted to 16 bytes key?
The system has deployed for quite a time, it is very troublesome to update all the users' local key.
AES supports only 128, 192 and 256-bit keys. The two most likely scenarios are either
the 160-bit are sliced so that only the first 128-bit are used for the key or
the 160-bit are padded with zero bytes (\0) to get either a 192-bit or a 256-bit key.
And the winner is: pad the 20-byte key with 4 zero bytes (\0) to get the proper key to be compatible with other AES implementations.
I know String and Algorithm to generate MD5 hash value, Is it possible to get back the String from generated Hash.
The very definition of a hash is a one-way, unique, encrypted value. Mathematically, consider it nearly impossible to get back the string generated from the hash.
Exceptions would be:
a vulnerability in the hashing algorithm (this happened with MD5, but its still difficult to crack it)
brute forcing (guessing) the string until you find a matching hash
using lookup tables of well-known phrases/words, and their associated hash values, eg: https://crackstation.net/
No; hashing is, by definition, a one-way process.
To derive the original string from the hash cannot be done without brute forcing different strings until one is found which generates an identical hash.
This process can take a very long time, though databases of known hashes exist which can speed up the process.
You should also know that two different strings can have the same hash. This is called a hash collision.
The MD5 is cryptographic hash function. It produces a 128-bit hash value. it is in text format of 32 digit hexadecimal number. It is used to verify data integrity.
No, you can not get actual value from hash value. I think you are looking for encryption and decryption mechanism.