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eliminates "l" and "o" characters change length by changing 'x' here: cut -c 1-x
"That command will encrypt the unencrypted-data.tar file with the password you choose and output the result to encrypted-data.tar.des3. To unlock the encrypted file, use the following command:"
openssl des3 -d -salt -in encrypted-data.tar.des3 -out unencrypted-data.tar
Allows you to connect to an SMTP server over TLS, which is useful for debugging SMTP sessions. (Much like telnet to 25/tcp). Once connected you can manually issue SMTP commands in the clear (e.g. EHLO)
A quick and simple way of outputting the start and end date of a certificate, you can simply use 'openssl x509 -in xxxxxx.crt -noout -enddate' to output the end date (ex. notAfter=Feb 01 11:30:32 2009 GMT) and with the date command you format the output to an ISO format.
For the start date use the switch -startdate and for end date use -enddate.
command to decrypt:
openssl enc -aes-256-cbc -d < secret.tar.enc | tar x
Of course, don't forget to rm the original files ;) You may also want to look at the openssl docs for more options.
When you don't have c_rehash handy. Really simple - if you have a .pem file that doesn't really contain a x509 cert (let's say, newreq.pem), it will create a link, simply called '.0', pointing to that file.