Archive for the ‘Encryption’ Category

Retrieving information from an SSL Certificate ( Using openssl command line)

January 25, 2008

Assume that cert.pem is the cert you have as a text file.

>> who issued the cert?
openssl x509 -noout -in cert.pem -issuer

>> to whom was it issued?
openssl x509 -noout -in cert.pem -subject
>> for what dates is it valid?
openssl x509 -noout -in cert.pem -dates

>> the above, all at once
openssl x509 -noout -in cert.pem -issuer -subject -dates

>> what is its hash value?
openssl x509 -noout -in cert.pem -hash

>> what is its MD5 fingerprint?
openssl x509 -noout -in cert.pem -fingerprint

Encrypt a file from command line using gpg

January 22, 2008

To encrypt a file

$gpg -c filename

To Decrypt file

$gpg file.gpg