Why do cryptologists recommend changing the encryption key from time to time? Is it the same reason security experts recommend changing a password from time to time? How can one determine how frequently to change keys or passwords?
What will be an ideal response?
A key may be guessed or learned, which renders all ciphertext from that point forward vulnerable. This is similar to why experts recommend changing passwords periodically. The period of key or password change should match the sensitivity of the data being encrypted: more sensitive data entails more frequent key changes.
Computer Science & Information Technology
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