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1wiseguy t1_ja3aft4 wrote

There are 3 ways an adversary can read your encrypted message:

  1. Somebody gave them the key, either deliberately or by mistake.

  2. The algorithm is faulty or weak.

  3. The adversary has the resources to do a brute-force attack. That relates somewhat to #2.

All of these can be avoided, if you do it right. Sometimes people don't do it right.