Outcomes Being Assessed:

Analyse various digital signature schemes $($e$.$g$.$ NIST DS$,$ Elgamal DS$,$ Schnorr DS$,$ RSA$-$PSS DS$).$

$$ Analytical thinking in solving realistic problems.

$$ Building and analysing the concept of electronic signature using a Cryptool$-2.$

Outline of Problem:

Digital signature may be a numerical conspire for confirming the realness of computerized messages or reports. A substantially advanced signature, where the prerequisites are fulfilled, gives a beneficiary exceptionally tall certainty that a known sender made the message and was not modified in travel. Presenting a Digital signature can be used by different algorithms!

Detail of Questions:

The Question

A$.$ Widespread acceptance of the cryptological model of electronic signatures could only have occurred based on several factors. Can these factors change or be fixed? Answer the below questions:

$1.$ illustrate two different algorithms used for the construction of Digital signature.

$2.$ structure one of the chosen algorithms by using Cryptool$-2.$

$3.$ Indicate a scenario where a digital signature has been a dilemma in real life and how this dilemma can be solved in order to improve the security level.

What you should hand in:

A report following the structure outlined in $$Detail of Questions$$ above. All sources of information MUST be referenced. You have to answer: all sections. Therefore, by handing this assignment $3$ sections in total with their answers would be submitted.

Rules:

While solving all parts, you have to in each group:

$$ Indicate the steps of solving the question in detail

$$ If you need to present assumptions, please do so$.$

$$ In question A$\mathrm{.}2$

o Structuring the chosen algorithm: the key policies need to be named after your name, such as Ahmed Harbaoui K$($AH$),$ and any extra key will be tagged with a number such as K$($AH$1),$K$($AH$2),$K$($AH$3)...$

o indicate the chosen phase $($signing or verification$).$

$$ In question A$\mathrm{.}3$

o indicate the chosen part from the scenario $($dilemma or solution$).$