Exam Details
| Subject | Cryptography | |
| Paper | ||
| Exam / Course | Master's in Mathematics with Applications in Computer Science | |
| Department | School of Sciences (SOS) | |
| Organization | indira gandhi national open university | |
| Position | ||
| Exam Date | June, 2016 | |
| City, State | new delhi, |
Question Paper
1. Write a programme in C language that decrypts text which is encrypted using the affine cipher. Verify the programme by decrypting the following text which was encrypted using the affine cipher with key 10).
ULSKA LJCVC AUNL UMCAU LSKAL JC5IP
AUNL UMCAU LSKAL JCKYC INSUA RIMUL
Write a programme in GP that prints all the squares modules a given prime. It should print each square only once.
Suppose we take A 26, and consider "HELLO" as a number in base 27. Then "HELLO", when converted to a number, gives 8 +5·27 8216702. We can convert this back to text also.
Write programmes in GP that convert from text to number and number to text.
Let p=4294967311, q=4294968317, e 17. A certain text T was converted to a number and encrypted by raising it to the power e(modulo n). The number obtained is 12006217362570451251.
Find the plain text by using GP.
ULSKA LJCVC AUNL UMCAU LSKAL JC5IP
AUNL UMCAU LSKAL JCKYC INSUA RIMUL
Write a programme in GP that prints all the squares modules a given prime. It should print each square only once.
Suppose we take A 26, and consider "HELLO" as a number in base 27. Then "HELLO", when converted to a number, gives 8 +5·27 8216702. We can convert this back to text also.
Write programmes in GP that convert from text to number and number to text.
Let p=4294967311, q=4294968317, e 17. A certain text T was converted to a number and encrypted by raising it to the power e(modulo n). The number obtained is 12006217362570451251.
Find the plain text by using GP.
Other Question Papers
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Subjects
- Algebra
- Coding Theory
- Complex Analysis
- Computer Graphics
- Cryptography
- Design and Analysis of Algorithms
- Differential Equations And Numerical Solutions
- Functional Analysis
- Graph Theory
- Linear Algebra
- Mathematical Modelling
- Pattern Recognition and Image Processing
- Probability And Statistics
- Programming and Data Structures
- Real Analysis
- Soft Computing and its Applications