Since the 1990s Pakistan has quietly and extensively changed how it creates and manages spies inside India. For decades Pakistan mainly relied on agents recruited and trained in Pakistan to pass as Indians. After their training, which often took years, was completed these agents were sent to India where they often spent many more years working their way into jobs where they could obtain useful information. The Pakistani agents also sought Indians willing to gather information, usually for a price. India is a poor country and many low level, and poorly paid, government employees were willing to sell information if the price was right.
Over the years India became more effective and detecting and arresting these spies as well as their Pakistani handlers. As a result Pakistan began switching from using agents inside India to recruiting and managing spies via the Internet. The highly trained Pakistani agents could remain safe in Pakistan and develop techniques to find and manage Indian spies via the Internet. India still catches these spies, but has come to discover that there are a lot more of them. Sin 2015 more than a dozen were arrested. This included four post office employees who were intercepting mail sent from one Indian base to another and looking for salable information. That was passed on to Pakistan, which paid well for this stuff. Often information was literally phoned in using hard-to-trace SIMS supplied by the Pakistanis.
Pakistan accepted the risk of these spies getting caught because the payoff was often considerable. For example in early 2015 Indian police arrested an employee (a cameraman) for the government defense research organization (DRDO) and accused him of spying for Pakistan. The suspect was accused of passing on information about missile research and tests and doing so for up to ten months. The suspect admitted that he had met with ISI (Pakistani intelligence) agents in India several times in 2014. Apparently this man was caught because Indian intelligence was monitoring ISI agents. It’s unclear why the Indian man agreed to be a spy, although money appears to be the most likely motivator.
In addition to cash Pakistan has found that sex also works and is being used more frequently via the Internet. Thus in mid-2014 an Indian army warrant officer (Subedar) was arrested and charged with spying for Pakistan. The arrested man had been recruited in 2013 via Facebook by a woman who sent him software that he posted to his work server. This software enabled the Pakistanis to hack into the headquarters where the warrant officer worked. The Pakistani woman (or someone posing as a woman) convinced the warrant officer she was interested in him and asked him to help her with some work she was doing for the NGO she was employed by. The warrant officer fell for all this and enabled the Pakistanis to get a lot of information about the readiness and deployment of several Indian missile units. It is as yet unclear if the warrant officer knew he was being played or that he was really smitten by his new online girlfriend.
Such honey traps (using sex for recruiting or blackmailing people to spy) have been encountered in India for quite some time and were known to exist in antiquity. In 2011 an infantry lieutenant-colonel was prosecuted for spying for Pakistan. The officer was recruited in 2010 while in Bangladesh, where he was attending a course at a Bangladesh military school. The Pakistani ISI had a woman operative seduce the Indian officer, and the sexual activity was recorded on video. The officer was given a choice of the video being made public, or him becoming a Pakistani spy. The officer became a spy and was caught by Indian counterintelligence after a few months.
Honey traps are still less frequently encountered in South Asia and the most common method is still simply offering cash. An Indian army clerk was arrested earlier in 2014 for doing that. In early 2013 India police arrested four Indians and accused them of working for ISI and passing on information and documents for at least three years. That spy cell mainly operated near the Nepal border and cash was the main motivator.
Pakistan is constantly seeking Indian military personnel willing to spy for cash. Even most Indian Moslems have no love for Pakistan and thus ISI concentrates on the greed, need or blackmail approach to recruiting Indian agents. India does the same in Pakistan, but India, with six times the population of Pakistan, is a far larger target and has more secrets Pakistan wants.