i am embedded programmer and i am using cc3200 wifi chip,in my project .i need to flash certificate of letsencrypt issuer is DST Root CA x3 .can anyone tell me about how to find certificate tls version TLS 1.0 ,TLS 1.1 or TLS 1.2 using and encryption type SHA256,SHA from certificate.
The relevant certificates are all available at
If you do this, you should be very careful about the consequences for the lifecycle of your projects. In particular, Let's Encrypt does not promise to always keep using the same certificates for issuance in the future. They could change at any time (and will certainly change before their expiration dates). This is especially true for Let's Encrypt intermediate certs (although those aren't the ones that you asked about here). Sometimes embedded devices have become less useful over time because they have hard-coded certificates that were no longer in active use and couldn't be updated easily to accept newer certificates.
The particular technologies such as TLS 1.0, TLS 1.1, TLS 1.2, and so on are not specified by the certificate. They are specified by the individual web servers that use the certificates. The web servers can choose to use pretty much any combination of TLS technologies, as negotiated between the server and a client, and the certificate does not limit this.
To learn more about these technologies, you might want to consult some online tutorials or a book such as Ivan Ristić's Bulletproof SSL and TLS, which is a great reference to how every part of the system works:
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