I've factored the RSA keys of a Certificate Authority from the 90s
A security researcher announced that they have successfully factored the RSA private keys used by a Certificate Authority that issued certificates in the 1990s. The breakthrough demonstrates that cryptographic keys of that era, often 512‑bit or early 1024‑bit sizes, are vulnerable to modern factoring techniques. The finding raises concerns about legacy certificates still in use and highlights the need for updated key lengths.