Dear Maintainer,
Can’t mount existing ecryptfs Archive filesystems, since libnss3-1d and libnss3 were updated to jessie/updates/main amd64 2:3.26-1+debu8u3 on Mon 16th Oct.
The syslog entry was:
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mount.ecryptfs: Error initializing key module [/usr/lib/x86_64-linux-gnu/ecryptfs/libecryptfs_key_mod_gpg.so]; rc = [-22]
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Since ecryptfs-utils (103-5+deb8u1) depends on libnss3-1d, my guess is the fault arose there.
However, the fault may actually be in lack of testing with ecrypt-utils.
Downgrading libnss3-1d and libnss3 to (2:3.26-1+debu8u2) and holding there resolved the problem for now.