Ctrlk

Block-ciphers

Block ciphers

DES algorithm video - 1

DES algorithm video - 2

In order to understand hex and type parameters read Hash

In order to understand encryption and decryption read Stream

AES

AES algorithm video - 1

AES algorithm video - 2

Description: Block cipher and AES winner.

Key:128, 192, 256 bits.

Iv: 128 bits.

Uses: General propuse, Performance is impportant, FIPS 197, NIST.

RC6

Description: Block cipher and AES finalist.

Key: 128, 192, 256 bits.

Iv: 128 bits.

Uses: General propuse, alternative to AES.

MARS

Description: Block cipher and AES finalist.

Key: 128, 192, 256 bits.

Iv: 128 bits.

Uses: General propuse, alternative to AES.

Twofish

Description: Block cipher and AES finalist.

Key: 128, 192, 256 bits.

Iv: 128 bits.

Uses: General propuse, alternative to AES.

Serpent

spec

Description: Block cipher and AES finalist.

Key: 128, 192, 256 bits.

Iv: 128 bits.

Uses: General propuse, alternative to AES.

CAST-256

Description: Block cipher and AES finalist.

Key: 256 bits.

Iv: 128 bits.

Uses: General propuse, alternative to AES.

Camellia

Description: Block cipher, The cipher has been approved for use by the ISO/IEC, the European Union's NESSIE project, the Japanese CRYPTREC.

Key: 128, 192, 256 bits.

Iv: 128 bits.

Uses: General propuse, alternative to AES.

Speck128

Key: 128, 192, 256 bits.

Iv: 128 bits.

Uses: IoT

Simeck64

Key: 128 bits.

Iv: 64 bits.

Uses: IoT

Modes of Operation

Modes of Operation video

CTR

Description: Block cipher mode

Uses: Performance is important.

GCM

Description: Block cipher mode

Uses: Authenticated encryption.

It only support "type":"string"
It doesn't support "algorithm":"SIMECK64"

How to ???

In this example we encrypt and decrypt Hello world! string using AES with the key and iv given in CTR mode.

On datajs["algorithm"] can be one of {AES, RC6, MARS, Twofish, SERPENT, CAST256, CAMELLIA, SPECK128, SIMECK64 }_

In this example we encrypt and decrypt Hello world! string using AES with the key,iv,adata given in GCM mode.

On datajs["algorithm"] can be one of {AES, RC6, MARS, Twofish, SERPENT, CAST256, CAMELLIA, SPECK128}_

Json to enc string (key and iv depends on algorithm you chose) in CTR mode

Json to dec string (key and iv depends on algorithm you chose) in CTR mode

To enc/dec a file you need to change "type":"string" -> "type":"file" , "plaintext": "your hex enc string " -> "file":"your file"
To use enc/dec GCM mode you need to change "mode":"ctr"->"mode":"gcm" , add "adata":"your string" and "hex" parameters
"hex" parameter apply for "string" and "adata" parameter

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Last updated 4 years ago

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#!/usr/bin/env python

import requests
import json
import os,binascii

def sending(message):
    url = 'http://127.0.0.1:6613/'
    response = requests.post(url, data=message)
    print response.content
    return response.content

def stream(data_js):
    req=json.loads(data_js)
    print "Enc \n " + json.dumps(req) +"\n"
    data_js_n=sending(json.dumps(req))
    answ=json.loads(data_js_n)
    print "Recived enc: \n" + (json.dumps(answ)) +"\n\n\n"
    dec='{"algorithm":"AES","plaintext":"","iv":"b05691ef92cb9c9bb05691ef92cb9c9b",\
    "version":1,"key":"b05691ef92cb9c9bb05691ef92cb9c9b","operation":"dec","type":"string", "mode":"ctr"}'
    req=json.loads(dec)
    req["plaintext"]=answ["result"]
    print "Dec \n " + json.dumps(req) +"\n"
    data_js_n=sending(json.dumps(req))
    answ2=json.loads(data_js_n)
    print "Recived dec: \n" + (json.dumps(answ2)) +"\n\n\n"


data_js='{ "version": 1 , "algorithm":"AES" , "type":"string", "plaintext": "Hello world!", "hex": 0,"operation":"enc",\
"key":"b05691ef92cb9c9bb05691ef92cb9c9b","iv":"b05691ef92cb9c9bb05691ef92cb9c9b", "mode":"ctr" }'
stream(data_js)

#!/usr/bin/env python

import socket
import json
import os,binascii

def sending(message):
    ip = '127.0.0.1'
    port = 6613
    BUFFER_SIZE = 65536
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    s.connect((ip, port))
    s.send(message)
    data = s.recv(BUFFER_SIZE)
    s.close()
    return data

def stream(data_js):
    req=json.loads(data_js)
    print "Enc \n " + json.dumps(req) +"\n"
    data_js_n=sending(json.dumps(req))
    answ=json.loads(data_js_n)
    print "Recived enc: \n" + (json.dumps(answ)) +"\n\n\n"
    dec='{"algorithm":"AES","plaintext":"","iv":"b05691ef92cb9c9bb05691ef92cb9c9b",\
    "version":1,"key":"b05691ef92cb9c9bb05691ef92cb9c9b","operation":"dec","type":"string", "mode":"gcm" ,"adata":"ABCD"}'
    req=json.loads(dec)
    req["plaintext"]=answ["result"]
    print "Dec \n " + json.dumps(req) +"\n"
    data_js_n=sending(json.dumps(req))
    answ2=json.loads(data_js_n)
    print "Recived dec: \n" + (json.dumps(answ2)) +"\n\n\n"


data_js='{ "version": 1 , "algorithm":"AES" , "type":"string", "plaintext": "Hello world!", "hex": 0,"operation":"enc",\
"key":"b05691ef92cb9c9bb05691ef92cb9c9b","iv":"b05691ef92cb9c9bb05691ef92cb9c9b", "mode":"gcm" ,"adata":"ABCD"}'
stream(data_js)