Symmetric and asymmetric cryptography pdf

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Asymmetric Key Cryptography Asymmetric cryptography , also known as Public-key cryptography, refers to a cryptographic algorithm which requires two separate keys, one of which is private and one of which is public. The public key is used to encrypt the message and the private one is used to decrypt the message. Types of Cryptography Asymmetric Key Cryptography Asymmetric Key Cryptography Asymmetric Key Cryptography Presented by Diffie & Hallman (1976) New directions in cryptography In symmetric cryptography: 1. If Alice and Bob are physically apart and communicate, they have to agree on a key Meet personally, or Use trusted couriers Use trusted couriers 2. Symmetric cryptography, known also as secret key cryptography, is the use of a single shared secret to share encrypted data between parties. Ciphers in this category are called symmetric because you use the same key to encrypt and to decrypt the data. RSA ,ELGAMMAL ,Diffie - cryptography mainly deals in coHellman, Digital signatures. Keywords: - AES, DES, Triple DES, Blowfish, RC4, RSA, ELGAMMAL, Diffie - Hellman, Digital signatures. 1. INTRODUCTION CRYPTOGRAPHY It is the art of secret writing [1]. Cryptography is the creativity of translating the original plain text in to cipher text. 9. Key Points in Asymmetric Encryption Asymmetric encryption use two keys: Public Key - to encrypt the data Private Key - to decrypt the data These keys are generated together. The Public key (s) is distributed freely between the sender and receiver. The other is named as Private Key and it is kept hidden. The Private Key is only used for An asymmetric-key (or public-key) cipher uses two keys: one private (To encrypt data) and one public (To decrypt data). 30.6 f• Asymmetric Key Cryptography (Public Key Cryptography) - 2 different keys are used - Users get the Key from an Certificate Authority Advantages 1. More Secured 2. Authentication Disadvantages 1. Relatively Complex 30.3 Symmetric-key cryptography • Advantages: - Simple - Faster • Disadvantages: - Key must exchanges in secure way - Easy for hacker to get a key as it is passed in unsecure way. Figure 30.4 Asymmetric-key cryptography. 30.5 Note. An asymmetric-key (or public-key) cipher uses two keys: one private (To encrypt data) and one public 8 Asymmetric Key Overview Relatively, new (mid-'70's) cryptographic technology Utilizes two different, but mathematically related, keys. Normally, public key is widely distributed Only one person possesses private key (bound to identity) A message encrypted with one key can only be decrypted with the other. Solves classic cryptography key management problem Asymmetric Cryptography View all Topics Download as PDF About this page Security component fundamentals for assessment Leighton Johnson, in Security Controls Evaluation, Testing, and Assessment Handbook (Second Edition), 2020 Asymmetric Asymmetric cryptography is a second form of cryptography. than the asymmetric cryptography which make symmetric cryptography less secure for more sensitive data [7], [8]. Fig. 1. Working of encryption and