shark/README.md

# Shark

Shark is a sha256+xor based encryption.  
I made it because I want to try to break it.  
(Precisely: Show it does not provide semantic security, because it is not IND-CPA-secure)  
This will work iff I succeed in building a PPT-discriminator for sha256 from randomness  
As my first approach this discriminator will be based on an LSTM-network.  
Update: This worked out way better than expected; given long enought sequences (128 Bytes are more than enough) we can discriminate successfully in 100% of cases.  
Update 2: I did an upsie in the training-code and the discriminator is actually shit.  
Update 3: Turns out: sha256 produces fairly high quality randomness and this project seems to have failed...
small README 2021-09-20 11:34:57 +02:00			`# Shark`

The way markdown handles newlines is stupidwq 2021-09-20 11:35:29 +02:00			`Shark is a sha256+xor based encryption.`
			`I made it because I want to try to break it.`
			`(Precisely: Show it does not provide semantic security, because it is not IND-CPA-secure)`
			`This will work iff I succeed in building a PPT-discriminator for sha256 from randomness`
			`As my first approach this discriminator will be based on an LSTM-network.`
Sucessful discrimination; updated README 2021-09-21 16:00:43 +02:00			`Update: This worked out way better than expected; given long enought sequences (128 Bytes are more than enough) we can discriminate successfully in 100% of cases.`
bs-constant now only in one place and updated README 2021-09-22 22:27:53 +02:00			`Update 2: I did an upsie in the training-code and the discriminator is actually shit.`
			`Update 3: Turns out: sha256 produces fairly high quality randomness and this project seems to have failed...`