Inventory of Acra keys # Acra uses many keys, but the key hierarchy is built to satisfy both security and usability requirements. Depending on how many features, ClientIDs, and Acra services you use, your system will operate minimum of 2 keys (one Acra Master key and one storage symmetric key) to hundreds. The key hierarchy is illustrated in the table below (with abbreviations used: AS – AcraServer; AT – AcraTranslator; AC – AcraConnector; service means one instance of AcraServer/AcraTr...