'Key cryptosystems' diaporamas de présentation

UNIT-2

797 views • 60 slides

Knapsack Cryptosystems

632 views • 42 slides

RSA and Public Key Cryptography

627 views • 29 slides

CSCE 815 Network Security Lecture 6

CSCE 815 Network Security Lecture 6 . Public Key Encryption. Resources. /class/csce815-001/Handouts/ Assignment1.tar Stallings site Slides from Lawrie Brown & Henric Johnson. Private-Key Cryptography. traditional private/secret/single key cryptography uses one key

346 views • 24 slides

Cryptography and Network Security

Cryptography and Network Security. Third Edition by William Stallings Public Key Cryptography and RSA. Private-Key Cryptography. traditional private/secret/single key cryptography uses one key shared by both sender and receiver if this key is disclosed communications are compromised

368 views • 22 slides

Lecture 4 Cryptographic Tools ( cont )

Lecture 4 Cryptographic Tools ( cont ). modified from slides of Lawrie Brown. Message Authentication. protects against active attacks. verifies received message is authentic. contents have not been altered from authentic source timely and in correct sequence.

299 views • 21 slides

Public-Key Cryptography

455 views • 18 slides

287 views • 17 slides

Malleability of Cryptosystems

Malleability of Cryptosystems. Kevin Allison. Definitions. The ability to manipulate a given ciphertext ? into a ciphertext ? that, when decrypted, produces a related plaintext. Not being able to compute a different related ciphertext ? from a given ciphertext ?.

280 views • 17 slides

Public-key Encryption

Public-key Encryption. plaintext. plaintext. ciphertext. encryption algorithm. decryption algorithm. Problems with symmetric (private-key) encryption. 1) secure distribution of keys. 2) large number of keys. Solution to both problems: Public-key (asymmetric) encryption. key pub.

331 views • 10 slides

CEN 621 Cryptography and Network Security 201 1 -201 2 Spring Term

211 views • 7 slides