On Tuesday, August 12, 2025 at 8:10:03 AM UTC-4 Jeffrey Walton wrote:
GCM plaintext maximum length is specified in bits, not bytes. See
SP800-39D, Section 5.2.1.1 Input Data, p. 8, <
https://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-38d.pdf>.
That leads to:
2^39 - 256 = 549755813632
549755813632 / 8 = 68719476704
Is there a standard practice for handling AES encryption of large files?
E.g., create a new IV and resume encryption? Use something other than GCM
which has a higher limit?
Thanks!
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