/usr/include/vmime/security/ is in libvmime-dev 0.9.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/vmime/security/authenticator.hpp
/usr/include/vmime/security/cert/
/usr/include/vmime/security/cert/X509Certificate.hpp
/usr/include/vmime/security/cert/certificate.hpp
/usr/include/vmime/security/cert/certificateChain.hpp
/usr/include/vmime/security/cert/certificateVerifier.hpp
/usr/include/vmime/security/cert/defaultCertificateVerifier.hpp
/usr/include/vmime/security/defaultAuthenticator.hpp
/usr/include/vmime/security/digest/
/usr/include/vmime/security/digest/md5/
/usr/include/vmime/security/digest/md5/md5MessageDigest.hpp
/usr/include/vmime/security/digest/messageDigest.hpp
/usr/include/vmime/security/digest/messageDigestFactory.hpp
/usr/include/vmime/security/digest/sha1/
/usr/include/vmime/security/digest/sha1/sha1MessageDigest.hpp
/usr/include/vmime/security/sasl/
/usr/include/vmime/security/sasl/SASLAuthenticator.hpp
/usr/include/vmime/security/sasl/SASLContext.hpp
/usr/include/vmime/security/sasl/SASLMechanism.hpp
/usr/include/vmime/security/sasl/SASLMechanismFactory.hpp
/usr/include/vmime/security/sasl/SASLSession.hpp
/usr/include/vmime/security/sasl/SASLSocket.hpp
/usr/include/vmime/security/sasl/builtinSASLMechanism.hpp
/usr/include/vmime/security/sasl/defaultSASLAuthenticator.hpp