New to Harikavach >> Harikavach Introduction The Challange The challange in Harikavach is that it is a HandCryption technique. This implies that it must be humanly possible to encode/encrypt the message and decode/decrypt the message, without using a computer and in a reasonable time with minimal effort. Computers can be used to compromise the message. Computers can use Brute force technique to break the code. In Brute force technique the computer can try all the possible keys ( or a highly probable set ) on the message to compromise it. With increasing computing power, it is easy for a computer to try millions of key combinations within a reasonable period of time. This is the problem with level 4 . There are fixed number of keys that can be generated using Scramble Clock . Let us consider that we place all the possible keys in a Set. Then this set is the Key Set ( Key Space ). The Key Set is finite for Scramble Clock and also finite for Harikavac...
It has been a testing time since COVID Pandemic. Many established Professions, Institutions, Industries, and Systems are adapting to the new reality. Education is also changing itself. It's been almost four months that I have not conducted a lecture in a Physical Classroom. I have sifted Online wholly. I want to thank Google, especially for it's Google Meet. All my courses stalled due to COVID, and the new ones just launched are now normalized. I have occasionally been offering Video courses to a restricted audience, but now my classes are available internationally. I am happy that I can teach students from UK, USA, Canada, Dubai, Delhi, Rajkot, Bhopal,... And of course Mumbai, all together in a batch. Although international students have been attending my courses, they had to participate in my classes physically. The flexibility of Online arrangement is liberating. Some new facilities in Online Courses Registration through email Payment is possible through any form of ...
B ackground Last month I had asked a Java related question to all my students on a facebook post . Why is it that in Java, Objects are always to be allocated on heap? Why is dynamic allocation the only option in the toolbox of a Java developer while creating objects? It was a very interesting discussion on facebook. Many participants, my students and otherwise gave good arguments in defense of the Java Language Design. One of the arguments that came out shining, was that of the possibility of unsafe allocations on Stack Frame. Special thanks to Ted Lum, Chetan Parmar, Nishant Verma, Vaibhav Desai, Tusharkumar Thomar, Vimal Sakhiya, Clair Roma Henry, Subham Gadi, Makarand Bhosle, Prasad Kowli and Nirav Kothari for their participation and valuable arguments. Let me now, put forward my perception on why Java Language Designers would have taken such a decision. The following content in this article assumes that the reader is aware of memory models and lif...
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