# \#as4

**URL:** https://community.cdata.com/tag/as4/865.md

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## [Tips on replacing a self-signed private key certificate](https://community.cdata.com/t/tips-on-replacing-a-self-signed-private-key-certificate/1254)

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**Author:** [@James\_B](https://community.cdata.com/u/James_B)\
**Replies:** 0\
**Last updated:** [December 16, 2025, 10:37pm UTC](https://community.cdata.com/t/tips-on-replacing-a-self-signed-private-key-certificate/1254 "2025-12-16T22:37:42Z")

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Private key certificates are used in AS2 and other MFT protocols to allow for secure elements of MFT transfers – notably, data encrypted with the matching public key certificate can be decrypted with the private key cert…