public key cryptography ppt

encryption key e (PS: The most common values of e are 3, 17, and 65537. Microsoft uses 65537, and none of the three has security issues ), e and (p-1) * (q-1) are required. Finally, the Euclid algorithm is used to calculate the decryption key d.E * d = 1 (mod (p-1) * (q-1 ))N and d must also be mutually dependent. Numbers e and n are public keys, and d is privat

issues do not exist), requirements E and (p-1) * (q-1) coprime. Finally, the Euclid algorithm is used to compute the decryption key D, which satisfies E * d = 1 (mod (p-1) * (q-1)) where N and D are also coprime. The numbers e and n are public keys and D is the private key. Two primes p and Q no longer needed, should be discarded, don't let anyone know. When

§ 5 Public Key cryptosystem Introduction to §5.1 Public key cryptosystem First, public key cryptography system The public

The communication between networks is realized by means of transmitting messages, and in the process of transmitting these messages, it is very important to encrypt the message in order to protect the content from being stolen and modified. Encryption and decryption: Traditional encryption method, modern encryption method. Traditional encryption algorithm: Replacement encryption algorithm, displacement encryption algorithm. Modern encryption Method: Modern block encryption method. Encryption a

-key cryptography, uses two mathematically related values to encode (encrypt) information, one of which is called the public key, and the other is called the private key. Public key enc

: 1). For security, a sends data encryption to B. 2). Ciphertext is intercepted even during transmission because it is not known that the key cannot be decrypted. 3). b After the ciphertext is received, it needs to be decrypted using the same encryption key. 4). Requires a to pass the key to B, but securing the key dur

"Select the private key file that you just generated from the user key, and enter the password you just set in the Password box below 123456 (can not be the same as the system login password)Now you can use the public key to login, browse to select the user key location, and

first, public key encryption technology 1.2 Principles of the Public Key cryptography system Public Key Cryptography : Using different enc

As mentioned on the 35th page, the ferma's small theorem has very important applications in cryptography. I have not learned the If a is an integer and P is a prime number If a is not a multiple of P, this theorem can also be written However, I found that on page 34th, the description of the ferma small theorem is as follows: If n is a prime number and A is any positive integer less than N, then the Npower of A is the

Public Key or asymmetric encryptionPublic-Key or asypolicric Cryptography)Public Key Cryptography provides a secure way for computer users to exchange information. The

verification process, of course, wants everyone to be able to perform, and everyone sees that the signature is verified by verification that I signed it myself. ================= Split Line ================= Why, then, does the Lord ask such a question? We can see that RSA's encryption/verification, decryption/signature process is too similar. At the same time, the RSA system itself is symmetrical: if we turn to e as the private key, D as the

The AES password is a symmetric cipher that uses the same key for both encryption and decryption. The fatal disadvantage of symmetric passwords is in the distribution with passwords. If a sends a cryptographic method to B, then B needs to use the same key as a. If a modifies the key then he must send a message to B while also sending a new