SAN FRANCISCO (AP) — Two former federal agents are accused of using their positions and savvy computer skills to siphon more than $1 million in digital currency from the illegal black market Silk Road website while they and their agencies were operating an undercover investigation of the online drug bazaar. The pair appears to have acted independently of one another while using sophisticated encryption software, inside knowledge of the investigation and complex offshore banking transfers of digital money called bitcoins and U.S.