Can we do B.Sc Cyber Security after Humanities without Maths, With an aggregate score above 80% in 12th?

No, you cannot do B.Sc, Cyber Security without Maths.

Below mentioned are the eligibility criteria for Undergraduate programs 

For Cyber Security Undergraduates

• The students should have completed their 12th with Maths, Physics, and Chemistry as the compulsory subjects from a recognised board or university.
• They should have also scored a minimum of 50% marks once averaged during their class 12th to get admission in this course.

Some colleges give admissions on the basis of JEE in Cyber Security while some provide admissions based on academic performance and the scores that they have scored.