Understanding Certificate File Formats: PEM, PFX, DER & More | OpenSSL Guide in Tamil 🔐

Certificate File formats or extension of X509
1) .pem
2) .pfx, .p12, .pkcs12
3) .pkcs7, .p7b, .p7c, .p7s
4) .der
5) .cer, .crt, .cert
6) .ca-bundle

PEM - Privacy Enhanced Mail, base64 ASCII

PFX or P12 or PKCS12:

PFX - Personal Exchange Format
PKCS12 - Public Key Cryptography Standard

PKCS7 or P7B or P7C or P7S:
PKCS7 - Public Key Cryptography Standard version 7

DER - Distinguished Encoding Rules, Binary file format

CER or CERT or CRT:
Canonical Encoding Rules

CA - Bundle
Certificate Authority bundle

OpenSSL : This tool is used to convert one certificate format into another file format.

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