Security measures for countering unauthorized decryption

摘要

After a predetermined limit for decryption attempts has been exceeded by a user attempting to decrypt an encrypted electronic message or attempting to decrypt a encrypted electronic certificate associated with an electronic message, access to the electronic message may be restricted.

主权项

1. A method of managing a plurality of electronic messages, the method comprising:
receiving, at an electronic communication device, an electronic message and a session key, the electronic message encrypted with the session key, the session key being encrypted with an encryption passphrase; receiving a request to access the electronic message; receiving a candidate passphrase; arranging an attempt to decrypt the session key with the candidate passphrase; incrementing a count of failed decryption attempts responsive to determining that the attempt has resulted in a failure; and locking the electronic communication device in response to determining that the count of failed decryption attempts exceeds a limit, wherein the locked electronic communication device can be unlocked responsive to successful authentication of a device unlocking passphrase, the device unlocking passphrase being different from the encryption passphrase.