EDIT: please move to crypto (just realized it is the wrong one and “You can only post once every 40 minutes.”)
Suppose I give a sufficiently long key in a secure way (in person) to Alice.
I send her a file that is XORed with the key I initally gave her. In the file, there contains the message and a new, sufficiently long key.
Alice then creates a file and XOR with the key that is contained in my message. (Alice’s file contains her message and a new key)
What weaknesses are there to this approach? (Suppose too that we pad all messages with random bytes such that the file is 100 KiB in size)
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