IS-cryptograpy algorithms.pptx
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The document provides an overview of cryptographic algorithms, detailing symmetric and asymmetric encryption methods. It explains key components, such as plaintext, ciphertext, and encryption algorithms, and highlights commonly used algorithms like DES and AES. Furthermore, it emphasizes the importance of encryption key size in determining the strength of cryptographic systems.
IS-cryptograpy algorithms.pptx
- 1. Cryptographic Algorithms Mrs.G.Chandraprabha.,M.Sc.,M.Phil., Assistant Professor Department of Information Technology, V.V.Vanniaperumal College for Women, Virudhunagar.
- 2. Cryptograpy: The term is derived from the Greek word kryptos, which means hidden. Cryptographic Algorithms: Cryptographic algorithms are used for important tasks such as data encryption, authentication, and digital signatures.
- 3. Encryption & Decryption The process of converting plaintext into ciphertext. The process of converting ciphertext into plaintext.
- 4. Symmetric Encrption Symmetric encryption is an encryption methodology that uses a single key to encrypt (encode) and decrypt (decode) data There are five main components : plaintext encryption algorithm secret key Cipher text decryption algorithm
- 5. Symmetric Encrption 1. Plaintext The term plaintext refers to the original message that's created and sent into the encryption method 2. Encryption Algorithm The encryption algorithm takes the plaintext and converts it into an unreadable format. 3. Key The key holds the information on all the switches and substitutions made to the original plain text. 4. Cipher text The cipher text is the text that is now scrambled and ready to be sent 5. Decryption Algorithm Basically performing the encryption in reverse.
- 6. Two of the most common symmetric encryption 1. Data Encryption Standard (DES) : The algorithm takes the plain text in 64-bit blocks and converts them into cipher text using 48- bit keys. Smart cards SIM cards Modems Routers Set-top boxes
- 7. 2. Advanced Encryption Standard (AES). : AES based on the Rijindael algorithm, which was developed by Rijmen and Jone Daemen. The features of AES are as follows − Symmetric key symmetric block cipher 128-bit data, 128/192/256-bit keys Stronger and faster than Triple-DES Provide full specification and design details Software implementable in C and Java
- 8. Asymmetric Encrption Asymmetric Encryption consists of two cryptographic keys known as Public Key and Private Key. Asymmetric Encryption (also known as asymmetric cryptography) allows users to encrypt information using shared keys Diffie-Hellman ECC
- 9. Encrption Key Size: When deploying cipher ,it is important for user to decide on the size of the crypto variable or key, because the strength of many encryption applications and crypto system Is measured by key size. The length of the key increases the number of random guesses that have to be made in order to break the code. Creating a larger universe of possibilities increase the time required to make guesses, and thus a longer key directly influences the strength of the encryption.