tarit goswami

@fgrieu Ok

(thank you very much for the answer btw :-) )

Can I use this answer as argumentation for IND-CPA security?

Hi, @fgrieu

@fgrieu Please go to this message - chat.stackexchange.com/transcript/message/52821738#52821738

@fgrieu Can you please send me your mail here: [email protected] ? Please copy the mail and let me know after coping, I will delete this message then :)

Was not able to get your mail address :P

@fgrieu Thanks, can OAEP make it IND-CCA2 secure? Last time you said it can't

Is there any paper where the 1-bit leakage problem is mentioned?

@fgrieu Hi, Can I get your personal mail add.? :)

@fgrieu Thanks :)

@fgrieu Can you please give an informal argument for IND-CPA security of ElGamal + OAEP? Like given here - crypto.stackexchange.com/a/35195/60079

@fgrieu Thanks :)

@fgrieu Can you please tell me what is PS value?

@fgrieu Can you please elaborate the informal statement? I want to use it as a formal proof.

Here I have asked the question @fgrieu

Sorry for late reply :)

@fgrieu The padding oracle attack.

@fgrieu Sure, I will post a question.

@SEJPM I mean the padding oracle attack

@SEJPM @fgrieu Hi sir, can you please tell me how I can show that ElGamal + OAEP is secure from Oracle attack and ind-CPA attack?

@SEJPM Thanks for the detailed explanation :)

Using BLAKE2b hashing function

@SEJPM Yes, I'm trying to figure out the asymptotic complexity of ElGamal+OAEP

@SEJPM

Actually, I'm using Blake2b hashing function. I don't know how to compute it's complexity!

I want to compute time complexity for ElGamal with padding. Can anyone tell me how I can do it?

@SEJPM Ok

Ok, so I can first pad the message with OAEP and then use the padded message for ElGamal?

@SEJPM Actually as discussed few days ago, I'm using it with ElGamal encryption. Will there be something different than we do in RSA+OAEP?

Ok, thanks

@SEJPM How I can do it? By arguments I mean arguments of Python's hashlib.blake2 function's argument - docs.python.org/3/library/hashlib.html#hashlib.blake2s

I'm trying to pad a message with OAEP, and using the blake2b function as hashing function

I'm confused about which argument will be which thing

I want to use blake2b as a hashing function for OAEP padding. How I can use it? Can anyone help me?

@fgrieu Ok, got it, thanks :)

@fgrieu Can you please say some advantages of doing that(ElGamal+OAEP)?

I have to submit something new within 20days. That's why I want to do something new using OAEP :p I think OAEP+ElGamal will be new but how I can show the motive of doing that? (Like maybe ElGamal+OAEP is fast etc.)

@DavidCarlisle Ok thanks a lot :)

Can anyone tell me how I can add images side by side here?

Hi, I'm trying to add two images side by side in a resume template like this: overleaf.com/latex/templates/…

@TedShifrin Actually I'm too tired to think about it right now :p probably tomorrow I will get back to you. Is that ok?

Yes

Ok

Ooh, sorry, (1/4+1/2)

1/2

@TedShifrin $\frac12 + \frac{1}{2^2}+\cdots$

Given that the outset there is an equal $(.5,.5)$ prior probability of either coin.

Suppose I have either a fair coin or a bent coin, and I don’t know which. The bent coin has a $60\%$ probability of coming up heads. I throw the coin ten times and it comes up heads 8 times. What is the probability I have the fair coin vs. the probability I have the bent coin?

I'm not getting how to solve this probability problem -