Chapter 2 GatherinG requirements • Service calls—data interoperability: a. JSON Web Tokens (JWTs) are used for transmitting information between parties as JSON objects. This information can be secured by using a secret key using a hash-based message authentication code (HMAC algorithms or a public or private key pair using RSA algorithms). JWTs ensure the integrity of data transferred as well. b. Cross-site scripting (XSS) filters: You use the validation library to verify web service application programming interface (API) requests in line with (Java Specification Requests) JSR standards. XSS filters match suspicious content in data requests and reject them if there are matches. Disaster Recovery Requirements Disaster can be any situation that makes an organization’s operations prone to risk; it can be of any type, for example, natural disaster, equipment failure, or cyberattacks. Disaster recovery (DR) requirements help to continue business operations as normally as possible. You need to find the recovery point objective (RPO) and recovery time objective (RTO) for their DXP application. The RPO is the maximum duration of an application (age of Files, Database, User Sessions and Caches) that an organization must recover from backup for normal operation to resume after a disaster: for example, a DXP application has an RPO of 2 hours, and then the system must back up at least every 2 hours. The RTO is the maximum duration of time for an organization to recover an application from backup storage: for example, if the organization has an RTO of 1 hour, it will not be down for longer than that. Table 2-18 contains the disaster recovery requirements. Table 2-18. Disaster Recovery User Story Name Disaster Recovery trigger the DXp application should be able to recover in case of any disaster. script as a product owner, i want the DXp application to have an rpO of 2 hours, so that the application will back up every 2 hours and will reinstate the application to the backup point. acceptance Criteria the DXp application is recovered in 1 hour. 57