http://blog.linode.com/2013/04/16/security-incident-update/
Credit card numbers in our database are stored in encrypted format, using public and private key encryption. The private key is itself encrypted with passphrase encryption and the passphrase is not stored electronically. Along with the encrypted credit card, the last four digits are stored in clear text to assist in lookups and for display on things like your Account tab and payment receipt emails. We have no evidence decrypted credit card numbers were obtained.
不用换卡的话,各种已挂失的弟兄们赶紧取消挂失吧,60 块钱啊……