The Design of Modern Ciphers & Kirchhoff's Principle With Cipher Block Chaining (CBC) - Engineering Assignment Help
Assignment Task -
- Explain the meaning of “Kirchhoff's Principle” and its relevance to the design of modern ciphers.
- Outline the principles of the cipher block chaining (CBC) mode of operation, and explain the reasons behind its use.
- Compression methods are typically used to prevent the use of data redundancy in cryptanalysis.
- Calculate the theoretical maximum compression ratio which can be achieved for the following message (M2):
M2 = 1001111111
- Steve has managed to intercept two of Bob‘s messages to Alice (m1=42813, m2=39667) with their respective RSA digital signatures (s1=33121, s2=16879).
- Explain with numerical examples two methods that Steve may use to forge Bob’s signature.
- It is assumed that the following parameters of the RSA digital signature scheme used are known to Steve
RSA modulus N=49163
The exponent of e=151
Let ???? be the elliptic curve y2= x3 + ???? + 7 over the field F13 =Z13 We regard ???? as an Abelian group in the usual way.
- Explain the meaning of “group order” in number theory, then find the order of the above group and indicate whether or not this is a cyclic group.
- Find an integer ???? ≥ 0 such that ????(11,6) = (2, 2) in ???? and explain your working in details
- Find all pairs of points (P, Q) such that:
P + Q = 0 and explain your work in detail.
Alice has received the encrypted message {C1, C2} from Bob,
where:
C1= (2,2)
C2= 5
Explain in detail how to decrypt Alice’s message, assuming the Elgamal encryption algorithm with the above group (????) was used to encrypt it
You are also given the following information:
The generator point: G= (11,6)
Alice’s secret key: a=2
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