On Tue, 9 May 2023 17:48, Dim Xr said: > same size? Is there any way to have FPE (Format Preserving Encryption) via > GPGME?
No. GPGME uses the OpenPGP and S/MIME protocols (gpg and gpgsm) and is not suitable for your task. You need to use a low level crypto library for that (e.g. Libgcrypt) and decide which algorithm, mode and additional information you use. For example it is possible to create an IV or nonce from the block number but there are many security pitfalls. You may want to read some papers about crypto file systems and look at implementations for Linux and *BSD. In GnuPG we have a disk encryption tools (g13) but that takes only care of encrypting the actual symmetric encryption key. Everything else is left to dmcrypt. Shalom-Salam, Werner -- The pioneers of a warless world are the youth that refuse military service. - A. Einstein
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