"Is this obfuscation scheme unbreakable?"

"Well.. no." said people a couple of years later.

1. On GGHRSW13 specifically: Cryptanalyses of Candidate Branching Program Obfuscators

See also (concurrent, similar flavor):

2. Cryptanalysis of Indistinguishability Obfuscations of Circuits over GGH13

3. Zeroizing Attacks on Indistinguishability Obfuscation over CLT13

Some interesting candidates for secure obfuscation do remain.

See, for instance, Secure Obfuscation in a Weak Multilinear Map Model

"Is this obfuscation scheme unbreakable?"

"Well.. no." said people a couple of years later.

1. On GGHRSW13 specifically: Cryptanalyses of Candidate Branching Program Obfuscators

See also (concurrent, similar flavor):

2. Cryptanalysis of Indistinguishability Obfuscations of Circuits over GGH13

3. Zeroizing Attacks on Indistinguishability Obfuscation over CLT13

Some interesting candidates for secure obfuscation do remain.

See, for instance:

a) Secure Obfuscation in a Weak Multilinear Map Model

b) Preventing CLT Zeroizing Attacks on Obfuscation

"Is this obfuscation scheme unbreakable?"

"Well.. no." said people a couple of years later.

1. On GGHRSW13 specifically: Cryptanalyses of Candidate Branching Program Obfuscators

See also (concurrent, similar flavor):

2. Cryptanalysis of Indistinguishability Obfuscations of Circuits over GGH13

3. Zeroizing Attacks on Indistinguishability Obfuscation over CLT13

"Is this obfuscation scheme unbreakable?"

"Well.. no." said people a couple of years later.

1. On GGHRSW13 specifically: Cryptanalyses of Candidate Branching Program Obfuscators

See also (concurrent, similar flavor):

2. Cryptanalysis of Indistinguishability Obfuscations of Circuits over GGH13

3. Zeroizing Attacks on Indistinguishability Obfuscation over CLT13

Some interesting candidates for secure obfuscation do remain.

See, for instance, Secure Obfuscation in a Weak Multilinear Map Model