Openssl For Windows 11 ((top)) May 2026

openssl x509 -in cert.pem -outform DER -out cert.der

openssl verify -CAfile root.crt -untrusted intermediate.crt server.crt Windows 11 native tools (certlm.msc, certmgr.msc) prefer PKCS#12 (.pfx/.p12) or DER (.cer). OpenSSL bridges the gap.

openssl s_client -connect cloudflare.com:443 -tls1_3 openssl for windows 11

openssl base64 -in certificate.crt -out cert.b64 5.1 Importing Certificates into Windows Certificate Store After converting to PKCS#12 or DER, use PowerShell or certlm.msc (Local Machine) / certmgr.msc (Current User).

openssl s_client -connect example.com:443 -servername example.com The -servername flag enables SNI (Server Name Indication). openssl x509 -in cert

[alt_names] DNS.1 = myapp.local DNS.2 = www.myapp.local IP.1 = 192.168.1.100 IP.2 = 10.0.0.5

[v3_req] keyUsage = keyEncipherment, dataEncipherment extendedKeyUsage = serverAuth subjectAltName = @alt_names openssl for windows 11

openssl enc -d -aes-256-cbc -in secret.enc -out decrypted.txt -k myStrongPassword