In a few phrases, describe the four main kinds of public key distribution schemes.
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In a few phrases, describe the four main kinds of public key distribution schemes.
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- The main characteristic of the Public Key Infrastructure (ICP) – or Public Key Infrastructure (PKI) – is that it uses a pair of keys, public and private, to provide the underlying security services. Regarding aspects related to the security of a cryptographic system, analyze the following statements. I. Typically, what compromises the security of a cryptographic model has less to do with the design of that model and more to do with poor key management. II. Private keys must remain secret from all parties involved, throughout their lifecycle, including the owners of those keys, which is why they are also called secret keys. III. Because public keys are in the open domain they can be tampered with, there is no guarantee that a public key is correct. The infrastructure by which they are managed must be trusted. IV. A public key infrastructure (or Public Key Infrastructure - PKI) guarantees some aspects related to the life cycle of a public key, such as generation, installation and…Briefly discuss four broad types of plans for the Public key distributionQ: Alice wants to set up a business company that securely deals with her clients. Bob is a potential client that Alice wants to have a good connection. As a security consultant, your job is to devise a plan to establish a secure information exchange. The assumption is made that Alice and Bob already have their public and public keys; (PrivA, PubA) and (PrivB, PubB) respectively, and both of them have exchanged their public key beforehand. Your plan includes comprehensive protocols to secure all messages, according to Alice’s requirements below. Discuss your answers based on Asymmetric Encryption. i) Integrity: Alice and Bob want to make sure that every message sent cannot be forged by anyone. ii) Authenticity: Alice and Bob can verify that messages actually came from them. iii) Confidentiality: Alice exchanges business-related documents with Bob in a way, so that Alice and Bob may open, read or modify the documents.
- Q: Alice wants to set up a business company that securely deals with her clients. Bob is a potential client that Alice wants to have a good connection. As a security consultant, your job is to devise a plan to establish a secure information exchange. The assumption is made that Alice and Bob already have their public and public keys; (PrivA, PubA) and (PrivB, PubB) respectively, and both of them have exchanged their public key beforehand. Your plan includes comprehensive protocols to secure all messages, according to Alice’s requirements below. Discuss your answers. i) Integrity: Alice and Bob want to make sure that every message sent cannot be forged by anyone. ii) Authenticity: Alice and Bob can verify that messages actually came from them. iii) Confidentiality: Alice exchanges business-related documents with Bob in a way, so that Alice and Bob may open, read or modify the documents.In these three examples, we see how a surrogate key may be used as the primary key of a connection.PLEASE FILL OUT CHART Shared session key establishment using a Key Distribution Center (KDC). Using the following table, illustrate how Alice can initiate a secure session with Bob with the help of KDC. Here, KEKs are the long term key establishment keys used to transport the session keys across the network securely. Assume the encryption process to be as follows: Block (LB || RB) is 8 bits; Encryption Key (LK||RK) is 8 bits; Ciphertext = LC|| RC where LC=LB ⊕ RK; and RC=RB ⊕ LK; For example, if plaintext=A7 (Hexa) and Key = 6D; then LC=A ⊕ D = 1010 ⊕ 1101 = 0111 = 7 (Hexa); and RC = 7 ⊕ 6 = 0111 ⊕ 0110 = 0001 = 1 (Hexa); so Ciphertext = 71 (Hexa). To decrypt, it does the reverse operation: Given ciphertext of C=LC||RC, it finds plaintext B=LB||RB, by finding LB=LC ⊕ RK and RB = RC ⊕ LK. Alice KDC Bob KEK: kA = A6 (hexa) KEK: kA = A6 (hexa); kB = D8(hexa); KEK: kB = D8 (hexa); Alice sends a message to KDC requesting a session key between Alice and Bob…
- The use of a surrogate key for a connection's primary key has been considered in three cases.Subject is secure communication Two Bank employers (Mr.(A) and Mr.(B)) created a Secure channel to transfer their bank credentials, their communication engineer's advisor suggested (!) using RSA Algorithm as an encryption cipher. Mr.(A) and Mr.(B) chose the secret parameters as in Table (1). Table (1) Mr.(A) Mr.(B) 11 13 7 Clearly, show the solution steps for the following questions: Suppose that Mr.(A) sent the message (Transferred) to Mr.(B), and Mr.(B) then replied by a message (Received), find the encrypted message for the first TWO letters only, i.e. (Tr for the first case and Re for the second one.What is the role of session key in public key schemes?