DoJ security chief in plea over hackers

Carlin fears US faces ‘pre-9/11 moment’ in cyber attack fight

Strong dollar drives IBM lower

Company executive defends Chinese licensing decision

IBM sales slide for 12th straight quarter

Stronger dollar and weak emerging markets weigh on big blue

Post Office criticised on investigations

Report says causes of cash shortfalls not properly investigated

US insurance start-up valued at $1.5bn

Oscar attracts backing of Goldman and Li Ka-shing

Virgin Galactic - Spaceport spaceship two

Virgin Galactic to test second spacecraft

Future of suborbital programme likely to hinge on crash report

SK Group joins units amid chaebol clean-up

Family-run conglomerates urged to simplify cross-shareholdings

Google overhauls search rankings

Experts say ‘Mobilegeddon’ will inflict pain on websites

Cyber security funding tops $1bn

Amount raised by start-ups in sector doubles year-on-year

Hacker fighting on show at conference

Investors flock to RSA meet as online protection market booms

Instagram develops app for Apple Watch

Photo-sharing group makes first foray into wearable technology

Week in Review, April 18

Indian tax, financial fines, global gym deals and Yahoo-Microsoft revise search deal

Twitter ‘slow’ on abuse, says executive

Company not ‘appropriately recognised extent of harm inflicted’

Google’s search for a European answer

Internet giant may pay price for failing to offer real concessions

Taking on Google is the Madisonian way

If there is one thing the leaders of our revolution feared, it was the concentration of power

The rise, fall and rise again of Nokia

Deal to buy Alcatel-Lucent is the latest reinvention for the telecoms group

Etsy/Party City: fancy dress

Glittery and cheap or homemade and quaint? Both come with an overpriced stock

Bloomberg suffers global terminal outage

Investors lose use of screens for messaging, viewing prices and scanning for news

Brussels faces ‘delicate’ Google case

Most challenging part seen to be proving US group harmed consumers

China rows back on bank tech rules

Controls favouring domestic over foreign producers to be reviewed