Mohammad Jabed Morshed Chowdhury

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Symmetric Key Cryptography is one of the prominent means of secure data transfer through unreliable channel. It requires less overhead than Public Key Cryptosystem. We present here, a new algorithm based on 2-d geometry using property of circle, and circle-centered angle. It is a block cipher technique but has the advantage of producing fixed size encrypted(More)
Information security has played a great role in supporting security of organizational assets. Computes softwares / information systems developers have taken information security into great consideration particularly during systems/software development. There are several modelling languages that can be used to architect security features of information(More)
A CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart) is an automatic security mechanism used to determine whether the user is a human or a malicious computer program. It is a program that generates and grades tests that are human solvable, but intends to be beyond the capabilities of current computer programs. CAPTCHA(More)
Several security modelling languages (e.g., Misuse case, Secure Tropos) help dealing with security risk management at the system requirements stage. But no design level modelling language has been explored to model security risk. In this paper, we are focusing on SecureUML which is a design level modelling language to represent security risk. More(More)
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