Notice that I use the new function ORA_HASH to create a numeric hash value for the credit card. Now, you can simply query the data for a single credit card, and it automatically comes back in ...

While some cryptographically secure hash functions can make it hard to find these collisions, they still exist. In the same way, the strength of perceptual hash functions is also a major weakness.

Security researchers have achieved the first real-world collision attack against the SHA-1 hash function, producing two different PDF files with the same SHA-1 signature.

The 2025 paper claims that even without reordering elements over time, it is possible to construct a hash table using Krapivin's method that achieves far better probe complexity – the average ...