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Questions tagged [obfuscation]

Obfuscation is the process by which the code is altered so that a developer finds it much harder to understand clearly what the intended program does or how it operates. The larger the program the greater the obfuscation, as code becomes intertwined linking different segments through out the program.

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Is there any bijective obfuscation scheme which maintains a byte order (e.g. sorted) or does so after not too many trials? (for 128bit = 16 byte)

We have given 16 bytes and apply some order to them. For example sorting them by their absolute value. We want to obfuscate them as best as possible while maintaining their order. That means if we ...
J. Doe's user avatar
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Obfuscation scheme wanted

I'd like to know if there's any cryptographic scheme that implements something similar to what I'm summarizing here below. Thanks a lot for reading and for any hint or question. Intro-Scenery: There's ...
Lorenzo's user avatar
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Using asymmetric encryption + key rotation, is it possible to make an extra obfuscation layer?

I'm building a service, that works as the cipher and decipher for instant messages. It works by following the following steps: The sender encrypts the text(not long, mostly chatting messages) using a ...
DingoStiglitz's user avatar
2 votes
2 answers
546 views

Is there still a place for obfuscation (secret algorithms) in encryption?

As far as I know, the Second World War was won on codes that used obfuscation, not open source. These were also used during the cold war. For general use (not large companies with hundreds of ...
Zonnkq Shad's user avatar
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1 answer
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Combining decryption function with transformation in a way that can't be reversed

I have a program implementing a function $f$, and want to find a pair of functions $e$ and $h$ such that $h \circ e = f$, but $e^{-1}$ cannot be recovered from $h$. In other words, given some $e$-...
James's user avatar
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2 votes
0 answers
39 views

Homomorphic encryption and program obfuscation

[Say I want to outsource the computation of $y=f(x)$ without revealing information about $x$, $y$, or $f$. I thought I'd have to combine homomorphic encryption with some obfuscation $\mathcal{O}$, ...
yoyo's user avatar
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Are there servers that are oblivious to their own output?

Suppose there are $n$ parties with public keys $pk_1,...,pk_n$. Is it possible that a server S constructs an algorithm $A$ so that for some public random nonce $r$ given as input, S computes some &...
Doron's user avatar
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1 vote
1 answer
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Indistinguishability obfuscation and PRFs

Consider a family of pseudorandom functions $F$, each member $f_k$ of this family is indexed by a key $k$. It is true, due to a result by Barak et al, that black box obfuscation is not possible for a ...
BlackHat18's user avatar
4 votes
2 answers
140 views

Randomized encodings and Indistinguishability obfuscation

I want to understand the difference between randomized encodings and indistinguishability obfuscation (iO). Are randomized encodings a special type of iO?
BlackHat18's user avatar
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1 answer
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Efficient Obfuscation or Encryption method with low memory usage

We are manufacturing a sensor which transmits in 8 byte packets. This sensor will be used by several different receivers, some of which have very little spare RAM available (< 3 kb). On some of the ...
Disco Stu's user avatar
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What's the difference between VBB and iO?

What's the difference between the definitions of virtual black-box (VBB) obfuscation and indistinguishability obfuscation (iO)? Is there any presentation describing both? Furthermore, why is the ...
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4 votes
1 answer
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Virtual Black Box Obfuscator

For which class of circuits does the Virtual black box(VBB) obfuscator exists? If so Why? What are the attempts/further developments made in this topic?
Novice_researcher's user avatar
1 vote
0 answers
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Distributional Virtual Black Box security

Can anyone clearly explain the difference between these two notions of obfuscation security: VBB security and D-VBB Security. VBB Security: An obfuscated program is no better than just a black box ...
Vshi's user avatar
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10 votes
1 answer
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How inefficient are current Indistinguishability Obfuscation (IO) candidates?

Since last year, IO finally seems to be within our reach. Several papers (https://eprint.iacr.org/2020/1003, https://eprint.iacr.org/2020/1024 and https://eprint.iacr.org/2020/1042) proved the ...
CryptoPerson's user avatar
4 votes
1 answer
179 views

How to explain indistinguishability obfuscation (iO) to my grandmother?

At the risk of oversimplification, how do I explain indistinguishability obfuscation (iO) to my grandmother?
Nathan Aw's user avatar
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2 answers
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What is Black-Box Obfuscation?

I understand black-box obfuscation at some intuitive level as- "an adversary can learn nothing more from an obfuscated program/circuit/function than he or she can from a black-box access to the ...
DaveIdito's user avatar
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1 answer
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How can a learnable function be obfuscable?

I overheard in a lecture on cryptographic obfuscation that the learnable functions are obfuscable. But to me this seems so counter-intuitive. Let's take a linear function (as an example of learnable ...
DaveIdito's user avatar
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1 vote
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Cryptographic Code Anonymization

I've been reading a lot about techniques related to stylometry whereby programmers can be de-anonymized by analyzing their source code. Resisting deanonymization seems like a multifaceted problem. ...
Sidharth Ghoshal's user avatar
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0 answers
185 views

Decrypting an AES string

I'm dealing with a website that loads a javascript file which eventually sets an AES hash/value (whatever it's called) as a cookie. The file is heavily obfuscated making it hard to understand certain ...
Joe's user avatar
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1 vote
1 answer
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Personal ledgible quick cipher

The problem: When I'm writing or reading information (be it on a screen or a physical medium) the information is vulnerable. So long as I'm not alone, anyone can simply glance at my screen or journal ...
Dragongeek's user avatar
3 votes
1 answer
179 views

Quantum-secure obfuscation

My question is a follow-up to a recent question regarding quantum-secure time-lock puzzles (TLPs). TLPs can be built (in principle) from indistinguishability obfuscation (iO) [BGJ+,BGL+] as noted in ...
ckamath's user avatar
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