The press is reporting a $32M theft of the cryptocurrency Ethereum. Like all such thefts, they're not a result of a cryptographic failure in the currencies, but instead a software vulnerability in the software surrounding the currency -- in this case, digital wallets.
This is the second Ethereum hack this week. The first tricked people in sending their Ethereum to another address.
This is my concern about digital cash. The cryptography can be bulletproof, but the computer security will always be an issue.