In the package in-toto up to 1.4.0, the PGP trust model is not (fully) considered: PGP Key Creation Time Not Validated, and PGP Key Usage Flags and PGP Key Revocation are not considered. The preferred mitigation strategy is to verify these properties when exporting a public key from GnuPG, and to clarify usage documentation that no verification against the PGP trust model is performed afterwards. This mitigation addresses all 3 issues of this vulnerability.