Indian Law won't cover you being photographed secretly but there is still some hope, IPC Law and Order

Ref. to IPC (The Indian Penal Code), 

1. https://www.indiacode.nic.in/  
2. https://indiankanoon.org/

News Articles: 

https://www.edexlive.com/news/2018/jan/08/indian-law-wont-cover-you-being-photographed-secretly-but-there-is-still-some-hope-1864.html#:~:text=*The%20law%20makes%20it%20clear,person%20in%20the%20photograph%20is

Ref. to Article  19, 21 *The law makes it clear you are free to take pictures for private use of other people in public areas under the Constitution of India Article 19, however publishing a photo in a manner that might be "embarrassing, mentally traumatic" or causing "a sense of insecurity about the activities the person in the photograph is involved in" is illegal under Article 21.

Section 509 in IPC, https://indiankanoon.org/doc/68146/ 

Section 354- A,B,C and D

Defamation Case: It is an act of imputing any person with intent to tarnish the dignity of the person by hacking their mail account and sending e-mails using vulgar language to unknown persons

Article 19 in The Constitution Of India 1949

19. Protection of certain rights regarding freedom of speech etc

(1) All citizens shall have the right

(a) to freedom of speech and expression;

(b) to assemble peaceably and without arms;

(c) to form associations or unions;

(d) to move freely throughout the territory of India;

(e) to reside and settle in any part of the territory of India; and

(f) omitted

(g) to practise any profession, or to carry on any occupation, trade or business