Decipher this code for 10$

[User]

I’m making a code which is difficult. For the 50$

Difficult is fine, but don't literally make it impossible. SHA1 is hash, which CANNOT BE DECODED. The only way is if the original encryptor HAS THE KEY and GIVES IT TO YOU[DOUBLEPOST=1556654553][/DOUBLEPOST]

SHA1 is IMPOSSIBLE to be decoded.

^

 

[Krispycubes]

Thread Title
Decipher this code for 10$

Prize name
10$ Paypal

Requirements and other relevant information
0062D3AFB663EFA70DB9EB978DC8BD7370FC91B9

Decipher this, information will follow.

End date
May 4, 2019

If award date is different from contest end date, please specify.
May 5, 2019

" * "

 

[Daniel]

I won’t make it impossible, but don’t expect it to be a walk in the park.

 

[Daniel]

Winners please message me, I already replied to the winners.[DOUBLEPOST=1556655330][/DOUBLEPOST]Winner*

 

[Harry]

Daniel An A for effort, but poorly executed.

Hashing a string using SHA1 means it's mathematically impossible to retrieve the original string unless you try to brute force and compare the two hashes (which will take a very long time, especially with a long string).

This is why hash functions are used to store passwords, as they're a one-way function.

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Besides that, you've just said he won, but SHA1 hash for the string did not match the one you put in the giveaway details.

 

[Badger]

LOL he was asking people to decrypt a hashed message... Oh gosh

 

[Harry]

Okay a lot of people have been getting angry at you for making this impossible, but I want to make sure you understand why it is impossible. There are two types of encryption: symmetrical and asymmetrical. Encryption algorithms like Base64 or a cipher are symmetrical because you can both encode and decode. Asymmetrical encryption like SHA can not be decoded with the current processing power of computers. It's just the way that the math behind it works, google it if you want. There is no point encrypting something with SHA1 and telling people to decrypt it because it is 100% impossible to. Please do your research next time before selecting a random encryption method on google.

Thanks for listening to my ted talk.

Slightly wrong, just wanted to correct you -

Base64 is a number system, just like Base10 is what we count in, or Base2 for computers, and a cipher is well, a cipher. - they're not examples of symmetrical encryption.

Symmetric encryption is using a single key, whereas asymmetric encryption uses a public and private key.

 

[Harry]

Yes, I know what Base64 is, but it is very commonly used as a symmetrical encryption method and it has basically become synonymous with "base64 encoding". I don't know why you say a cipher is not an example of symmetrical encryption, it most definitely is.

Regarding ciphers, that's true, so my bad.

However, encoding something does not mean it's being encrypted - give the data only, you could decode a Base64 string, but give just the data of an encrypted AES string, you could not decrypt it without the key.

 

[Harry]

You're right, I started using the terms synonymously when I shouldn't have.

No worries - just wanted to point it out, but I should've clocked that a cipher is still classed as encryption myself.

Anyway, Daniel - next time, use a mixture of ciphers, base16/base64 encoding, [binary, decimal, floating-point converstions] etc.

Or if you do use encryption, make the original string short so that it can be easily brute forced within a few minutes (or just provide the key encoded as mentioned above).

 

[Daniel]

Look, sorry for the confusion, next one will be better.