...
6.Audit mechanism and non-repudiation
Enables exchanging parties to maintain and revisit the history/sequence of events during a period of transaction
In e-commerce, these could be computer time ⦠A sender B receiver ; Transmission medium ; An interceptor (or intruder) may block, intercept, modify, or fabricate the transmission. Gsm security and encryption 1. Unfortunately, DES and other encryption mechanisms can be somewhat slow compared to a hash function. unbreakable encryption system An OTP is a list of numbers, in completely random order, that is used to encode a message If the numbers on OTP are truly random and OTP is only used once, then ciphertext provides no mechanism to recover the original key (one-time pad itself) and therefore, the message OTPs are used for ⦠Title: Chapter 2 Basic Encryption and Decryption 1 Chapter 2Basic Encryption and Decryption 2 Encryption / Decryption. Software licensing The owner of a system is an attacker Mobile agents Software agents on Internet perform a task on behalf of you Perform sensitive transactions on a remote (untrusted) host Single-Chip AEGIS Secure Processors Only trust a single chip: tamper-resistant Off-chip memory: verify the integrity and encrypt Untrusted ⦠Symmetric algorithm 40. The services are intended to counter security attacks and Security mechanism â A mechanism that is designed to detect, prevent or recover from a security attack. Encryption techniques 39. Security service â A service that enhances the security of the data processing systems and the information transfers of an organization. So the HMAC standard was created which allows using a hash algorithm with a secret key âmixed inâ to improve the speed while providing message integrity and authentication. The security and authentication mechanisms incorporated in GSM make it the most secure mobile ⦠The input register is updated one block at a time by the feedback mechanism. Encryption âRulesâ ⢠Never, ever trust a âsecretâ or proprietary crypto algorithm âUnless developer works for NSA âCrypto algorithms must be peer reviewed ⢠Never, ever rely only on technology as your only wall of defense ⢠Above all, never, ever attempt to write your own encryption system Real-World Application Voltage Security provide Identity-Based Encryption for emails IBE Toolkit available to those who would like to use the encryption services * -need for encryption -communication -emails -sensitive information -types of encryption -symmetric, non, public, private -types of public key -RSA -IBE is a public key encryption ⦠Encryption A process of encoding a ⦠The motivations for security in cellular telecommunications systems are : To secure conversations Signaling data from interception To prevent cellular telephone fraud. 3 Encryption / Decryption. To highlight the feedback mechanism, it is useful to think of the encryption function as taking input from a input register whose length equals the encryption block length and with output stored in an output register. Encrypted traffic and the use of encryption as an authentication mechanism within an organization's network is generally trusted, and direct access to keys and certificates allows anyone to gain elevated privileges. ⢠Encryption with key â encryption key: K E â decryption key: K D â C = E(K E, P) â P = D(K D, E(K E, P)) ⢠Keyless Cipher â a cipher that does not require the use of a key ⢠key cannot be changed If the encryption algorithm should fall into the interceptor âs hands, future messages can still be kept secret because the Concept of Encryption and Decryption 38. This is clearly seen in Stallings Figure 6.8. Snowden was a low-level SharePoint administrator who took advantage of the fact that keys and â¦