Hashing fast and slow: GPUs and 1Password

The net is atwitter with discussion of Jeremi Gosney’s specially crafted machine with 25 GPUs that can test hundreds of billions of passwords per second using hashcat, a password cracking system. Password crackers, like hashcat, look at the cryptographic hashes of user passwords and repeatedly make guesses to try to find a password that works. […]

Credit card numbers, checksums, and hashes. The story of a robocall scam

As  Lívia and I were out walking Molly and Patty on Monday evening, I received a telephone call from an unknown number. I decided to answer the phone anyway, and I was greeted by a recorded voice telling me that my Bank of America debit card beginning with 4217 has been limited and whether I […]