by Anish
Posted on Wednesday April 3 , 2019
This sample chapter extracted from the book, Go Lang Cryptography for Developers . The Book theme isCryptography is for EveryOne. Learn from Crypto Principle to Applied Cryptography With Practical Example
DES is the old "Data Encryption Standard" from the seventies. Its key size is too short for proper security (56 effective bits; this can be brute-forced, as has been demonstrated more than ten years ago). Also, DES uses 64-bit blocks, which raises some potential issues when encrypting several gigabytes of data with the same key (a gigabyte is not that big nowadays).
3DES is a trick to reuse DES implementations, by cascading three instances of DES (with distinct keys). 3DES is believed to be secure up to at least "2112" security (which is quite a lot, and quite far in the realm of "not breakable with today's technology").
Go lang builtin Package des implements the Data Encryption Standard (DES) and the Triple Data Encryption Algorithm (TDEA) as defined in U.S. Federal Information Processing Standards Publication 46-3.
fun NewCipher
creates and returns a new cipher.Block.
func NewCipher(key []byte) (cipher.Block, error)
fun NewTripleDESCipher
creates and returns a new cipher.Block.
func NewTripleDESCipher(key []byte) (cipher.Block, error)
The following example will show how to perform 3DES encryption and decryption of the given plain text message
package main
import (
"crypto/des"
"encoding/hex"
"fmt"
)
func main() {
// Mimimum Key Size of Length 24
key := "mysecretPasswordkeySiz24"
plainText := "https://8gwifi.org"
ct := EncryptTripleDES([]byte(key), plainText)
fmt.Printf("Original Text: %s\n", plainText)
fmt.Printf("3DES Encrypted Text: %s\n", ct)
DecryptTripleDES([]byte(key), ct)
}
func EncryptTripleDES(key []byte, plaintext string) string {
c, err := des.NewTripleDESCipher(key)
if err != nil {
fmt.Errorf("NewTripleDESCipher(%d bytes) = %s", len(key), err)
panic(err)
}
out := make([]byte, len(plaintext))
c.Encrypt(out, []byte(plaintext))
return hex.EncodeToString(out)
}
func DecryptTripleDES(key []byte, ct string) {
ciphertext, _ := hex.DecodeString(ct)
c, err := des.NewTripleDESCipher([]byte(key))
if err != nil {
fmt.Errorf("NewTripleDESCipher(%d bytes) = %s", len(key), err)
panic(err)
}
plain := make([]byte, len(ciphertext))
c.Decrypt(plain, ciphertext)
s := string(plain[:])
fmt.Printf("3DES Decrypyed Text: %s\n", s)
}
Thanku for reading !!! Give a Share for Support
Asking for donation sound bad to me, so i'm raising fund from by offering all my Nine book for just $9