"enc -bf-ecb" Command Summary

A quick summary is provided to list major features of the OpenSSL 'enc -bf-ecb' command. Blowfish algorithm in ECB operation mode with a random salt and PKCS#5 padding, or Blowfish/ECB/Salted/PKCS5Padding, is the recommended way to use Blowfish in ECB mode.

As a summary, we should remember the following about the OpenSSL "enc -bf-ecb" command:

OpenSSL "enc -bf-ecb" command allows us to run Blowfish algorithm in ECB (Electronic CodeBook) operation mode.

ECB (Electronic CodeBook) operation mode takes each plaintext block from the input stream and encrypt it independently from other blocks.

ECB (Electronic CodeBook) operation mode does not use the IV value.

OpenSSL allows us to run cipher operations in 3 ways: Literal Key, Salted Key and Random Salt.

"Literal Key" means the secret key and the IV are specified literally using "-K" and "-iv" options.

"Salted Key" means the secret key and the IV are derived from a passphrase and a salt given in "-pass" and "-S" options.

"Random Key" means the secret key and the IV are derived from a passphrase and a random salt using "-pass" and "-salt" options.

OpenSSL allows us to pad plaintext with the standard PKCS#5 padding algorithm, which uses an integer byte as the padding byte with value equal to the number of bytes to be padded.

With all options mentioned above, we have many choices to run Blowfish ECB mode encryption. But the recommended way is to:

By the way, ECB is the weakest operation mode comparing to CBC, CFB, and OFB.

Last update: 2015.

Table of Contents

 About This Book

 Blowfish Cipher Algorithm

 Perl Crypt::Blowfish Module

 Perl Crypt::ECB Perl Module

 Perl Crypt::CBC Module

 Perl Crypt::CFB Perl Module

OpenSSL "enc -bf-ecb" for Blowfish/ECB Encryption

 What is OpenSSL?

 Installing OpenSSL for Windows

 OpenSSL "enc" Blowfish Ciphers

 Ways to Control Secret Key and IV

 "bf-ecb" Cipher with Literal Key

 "bf-ecb" Cipher on Multiple Blocks

 Secret Key Padding and Truncation

 "bf-ecb" Cipher with Salted Key

 Salted Key Generation Algorithm

 "bf-ecb" Cipher with Random Salt

 OpenSSL Default Padding - PKCS#5

"enc -bf-ecb" Command Summary

 OpenSSL "enc -bf-cbc" for Blowfish/CBC Encryption

 OpenSSL "enc -bf-cfb" for Blowfish/CFB Encryption

 OpenSSL "enc -bf-ofb" for Blowfish/OFB Encryption

 References

 PDF Printing Version