After the attacks in London, ISIS makes large-scale and predictable use of online video as recruiting and inspiration tools. British police investigate the possibility that a cell which may have supported the attacker made use of encrypted messaging apps.

Two deadlines expire April 7. The Turkish Crime Family says it's going to wipe hundreds of millions of iOS devices unless Apple pays ransom. (Apple says the threat's a lot of hooey and pretty much everyone agrees.) And Anonymous will run its annual OpIsrael against various online targets in the Jewish state. (OpIsrael has traditionally been a fizzle that fails to rise beyond the level of low-grade nuisance, but Israeli authorities warn people to be on their guard nonetheless.)

WikiLeaks continues, largely in vain, to persuade tech vendors they ought to play ball in remediating the vulnerabilities suggested by the Vault 7 leaks. Consensus now seems to run toward Apple's early conclusion: the zero-days alluded to in the files allude are old news, for the most part patched long ago.

Distil Networks warns business and consumers of a threat to gift cards. "GiftGhostBot" uses nearly 1000 infected sites to inspect and drain gift cards of their balances.

Zscaler and others warn of a spike in March-Madness-themed phishing. ("March Madness" is shorthand for the annual US university basketball playoffs, much followed by gamblers, enthusiasts, and subway alumni.)

Users are encouraged to implement Instagram's two-factor authentication.

CrowdStrike retracts some aspects of its Ukrainian artillery hacking report, but not core findings concerning Agent-X malware.