Let's Encrypt vs Private CA for Internal Websites ?

The fundamental difference is who establishes trust.

Let's Encrypt is a publicly trusted Certificate Authority. Devices generally trust its certificates without the organization installing an internal CA.

A Private CA is controlled by the organization. Authorized devices are configured to trust the organization's CA.

For internal websites, both can provide HTTPS encryption and server authentication.

	Let's Encrypt	Private CA
Public trust	Yes	No
Internal hostnames	Limited	Yes
Private IP addresses	Subject to current IP-certificate rules	Yes
CT visibility	Public certificates are logged	No public CT requirement
Internet dependency	Yes for public issuance/validation	Can operate internally
Trust control	Public CA ecosystem	Organization controlled

Let's Encrypt can be a practical choice when automatic public trust and existing public-domain infrastructure are important.

A Private CA can be appropriate when an organization wants controlled trust, internal naming, private IP certificates or greater independence from public infrastructure.

In short: Neither is universally better. The appropriate choice depends on whether the application needs public Web PKI trust or controlled organizational trust.

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Let's Encrypt vs Private CA Let’s Encrypt internal SSL Private CA Private SSL Internal PKI Internal CA Certificate Transparency Public CA Private IP SSL

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