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Ciphr , a company which offers encrypted communications for BlackBerry 10 and Samsung Knox smartphones , claims that a rival firm are behind a data dump of its customers ' email addresses and their device 's IMEI numbers .
 ( data breach: a data dump,  IMEI numbers: compromised data, email addresses: compromised data, Ciphr: victim, a rival firm: attacker, customers: victim, device: victim) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: phishing, data breach, ransom, discover vulnerability, patch vulnerability, Arguments type: vulnerable system, capabilities, vulnerability, number of victim, issues addressed, compromised data, damage amount, common vulnerabilities and exposures, victim, patch number, number of data, tool, discoverer, time, purpose, place, payment method, releaser, vulnerable system version, attacker, supported platform, patch, price, vulnerable system owner, trusted entity, attack pattern. 
Text: {0} 
Answer:
 ( data breach: a data dump,  IMEI numbers: compromised data, email addresses: compromised data, Ciphr: victim, a rival firm: attacker, customers: victim, device: victim) 