Menu
Is it possible to decrypt(retain the actual string) the password which is saved in db using SHA1 algorithm.
Example:If password is "password" and it is stored in db as "sha1$4fb4c$2bc693f8a86e2d87f757c382a32e3d50fc945b24",is any chance to retain the same "password"(string) from "sha1$4fb4c$2bc693f8a86e2d87f757c382a32e3d50fc945b24"
794
Because SHA1 uses a single iteration to generate hashes, it took security researcher Jeremi Gosney just six days to crack 90 percent of the list.
You can't "reverse" or "invert" MD5, SHA256, bcrypt, SHA1, or similar hashes, salted or unsalted. You (usually) can't "decode" passwords, "decrypt" password hashes or "reverse" or "unscramble" password hashes at all. There's no such thing as "hash decryption".
Google publicly broke one of the major algorithms in web encryption, called SHA-1. The company's researchers showed that with enough computing power — roughly 110 years of computing from a single GPU for just one of the phases — you can produce a collision, effectively breaking the algorithm.
It is supposed to be unique and non-reversible. If a weakness is found in a hash function that allows for two files to have the same digest, the function is considered cryptographically broken, because digital fingerprints generated with it can be forged and cannot be trusted.
Since SHA-1 maps several byte sequences to one, you can't "decrypt" a hash, but in theory you can find collisions: strings that have the same hash.
The fact that SHA-1 is fast does not allow you to crack any password, but it does mean you can attempt more guesses per second. It is vulnerable to collision attacks, as Google showed. A collision attack allows someone to create two inputs with the same hash.
Like every hash function SHA-1 maps a large input set (the keys) to a smaller target set (the hash values). Thus collisions can occur. This means that two values of the input set map to the same hash value.
When you try to test to encrypt your string on any of the websites, they save the hash and plain text in their database. Thus, when you try to decrypt the hash, you will get the result. Try this simple exercise to make sure that SHA2 isn’t broken. Go to any of the website which claims to decrypt hash functions.
SHA1 is a cryptographic hash function, so the intention of the design was to avoid what you are trying to do.
However, breaking a SHA1 hash is technically possible. You can do so by just trying to guess what was hashed. This brute-force approach is of course not efficient, but that's pretty much the only way.
So to answer your question: yes, it is possible, but you need significant computing power. Some researchers estimate that it costs $70k - $120k.
As far as we can tell today, there is also no other way but to guess the hashed input. This is because operations such as mod eliminate information from your input. Suppose you calculate mod 5 and you get 0. What was the input? Was it 0, 5 or 500? You see, you can't really 'go back' in this case.
73
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
