Alice and bob encryption example

BBS) proposed the rst proxy re-encryption scheme, where the plaintext and secret keys are kept hidden from the proxy. It is based on a simple modi cation of the ElGamal encryption scheme [17]: let (G;) be a group of prime order p and let gbe a generator of G; Alice and Bob publish the public keys X= gx Figure 1: Alice and Bob use a private-key encryption scheme. Sometimes, in a private key system, an encryption scheme is associated with a message space M and some distribution on M. For example, M may be the set of all strings for a given length. The ciphertext space is the set of all possible plaintext messages m ∈M 4-1 Alice and Bob, fondly known as the first couple of cryptography, are really more interested in computational suitcases than physical ones. Suppose Alice gives Bob a securely encrypted computer file and asks him to sum a list of numbers she has put inside. Without the decryption key, this task also seems impossible. Alice decrypts the signature using Benedict's public key and verifies that the information in the certificate matches the decrypted signature. Alice checks that the identity in the certificate is indeed Bob. Alice can now trust the public key provided in Bob's message. Let's look more closely at the sequence of these events. Example: C program to encrypt and decrypt the string using RSA algorithm. RSA is another method for encrypting and decrypting the message. It involves public key and private key, where the public key is known to all and is used to encrypt the message whereas private key is only used to decrypt the encrypted message.

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2) When Alice wants to send a signed, encrypted message to Bob, she indicates that she wants the message signed and encrypted, and sends the message. 3) Alice's email program selects a random symmetric key to encrypt the message and creates a message digest of the message.

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Recently, Alice and Bob have been sending message to each other using the RSA Algorithm. Their public key is n=338,699 and e=77,893, and only Bob knows that n=p*q and p=577, q=587, thus n=577*587. Alice was accepted to graduate school and Bob asked what school Alice would be attending. Alice answers C=223,208. What is the graduate school Alice ... Bob locks his message by calculating m to the power of e mod n, call this c, his encrypted message, which he sends back to Alice. Finally, Alice decrypts his message using her private key d accessed through her trap door, c to the power of d mod n equals Bob's original message m.

Oct 31, 2017 · As opposed to symmetric cryptography, in which a single encryption key both codes and decodes messages, asymmetric cryptography features both encryption and decryption keys. 1. Bob sends a message to Alice, using her public encryption key to encrypt it into ciphertext. 2. Alice receives the encrypted message. 3. Examples: Data Encryption Standard (DES) and Advanced Encryption Standard (AES) Not proven to be unbreakable, but best known method is to brute force try all possible keys takes exponential amount of time Both Alice and Bob must know the same secret key.

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