The EU has delayed a decision over a plan to scan encrypted messages for child sexual abuse material. Critics say this is a c" that could break encryption.
One-way math doesn’t preclude finding a collision.
(And just to be clear, checksum in the context of this conversation is a generic term that includes cryptographic hashes and perceptual hashes.)
Also, since we’re talking about a list of checksums that could get someone in trouble, an attacker wouldn’t even have to find a collision with a specific one. This makes an attack far easier. See also: the birthday problem.
Checksums, on the other hand, are designed to minimize the probability of collisions between similar inputs, without regard for collisions between very different inputs.[8] Instances where bad actors attempt to create or find hash collisions are known as collision attacks.[9]
Checksums wouldnt work well for their purposes if they could easily be made to match any desired checksum. It’s one way math.
One-way math doesn’t preclude finding a collision.
(And just to be clear, checksum in the context of this conversation is a generic term that includes cryptographic hashes and perceptual hashes.)
Also, since we’re talking about a list of checksums that could get someone in trouble, an attacker wouldn’t even have to find a collision with a specific one. This makes an attack far easier. See also: the birthday problem.
Checksums, on the other hand, are designed to minimize the probability of collisions between similar inputs, without regard for collisions between very different inputs.[8] Instances where bad actors attempt to create or find hash collisions are known as collision attacks.[9]
https://en.m.wikipedia.org/wiki/Hash_collision#:~:text=Checksums%2C on the other hand,are known as collision attacks.