Luke Dashjr, a founding member of bitcoin and a core developer, alleges that on Dec. 31, his PGP key was hacked. As a result, almost all of his bitcoin was taken from him.
The developer claimed in a tweet on Jan. 1 that the suspected hackers had acquired access to his PGP (Pretty Good Privacy) key. This popular security technique employs two keys to access encrypted data. He did not say how much of his BTC was taken. Instead, he revealed a wallet address where part of the stolen BTC had been transmitted.
Source: https://crypto.news/bitcoin-core-engineer-loses-more-than-200-btc-to-hack/