INF2004F Summary Notes.docx

Payer sends electronic instructions to the bank about

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Payer sends electronic instructions to the bank about who, when and amount to pay Credit & debit card systems – payer transmits (sends) credit or debit card number to a secure server (where communication link is encrypted) Digital cash – bank attaches a digital signature to a note, promising to pay certain amount Trust in e-commerce: Privacy, business practices, and transaction integrity Cookies – small piece of information put on user’s computer & any merchant can get an access to it Web trust – programs to ensure consumer privacy
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Business practice disclosure Digital signatures and electronic signatures: Digital signature – encrypted document – verify document’s authenticity Electronic signature – scanned image of physical signature – less secure Module 3: Data/Transaction Processing & ERPs [chapter 7] Data processing cycle Operations performed on data Generate decision-useful information Data Input -> Data Processing -> Data Storage OR -> Information output Input systems: 1. Manual Input systems: - Inputs are based on handwritten /typed documents - Manually collected documents are collected and sent to data processing department for error checking and further processing - Source documents are physical evidence of inputs into transaction processing systems: Capturing data Facilitate operations Standardize operations Provide a permanent file for future analysis Transfer of source documents to data processing: Source documents – physical evidence of inputs Data processing should not accept data without input document control form (application control summary of all important pieces of data that are important for transaction to happen e.g. batch processed.) Data has to be legitimate Data entry – after source documents are received by data processing – manually keyed (typed)- controls enable the integrity of data is kept in check and correctness of data- all these controls are necessary in a manual system to ensure accuracy and integrity of data - Key verification – control procedure; detects errors during keying (typing) process - Visual verification- compares the source documents with a printout or screen image - Program data editing – thorough editing of data- screens data for errors; ensuring valid content (characters, fields, records, files) Program data editing (done through various techniques): - Table lookup- compares actual values with acceptable values in a table - Limit test- verifies hat numeric data is within acceptable ranges - Continuous operations auditing- the use of programmed edit test to discriminate acceptable data - Check digit- an extra redundant digit added to code a number similar to parity bit- technique used to ensure data is always correct - Valid code- particular table lookup consisting of valid codes- validity and existence check 2. Electronic Input systems: (online input systems)
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- Transactions are input directly into the computer system- need for keying is eliminated -
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