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Found 4 results

  1. Salut; am avut saptamana trecuta ideea de a crea o metoda de comunicare folosind CS: GO. Ca si guideline, Hwyl a trebuit sa respecte urmatoarele - sa fie usor de folosit (ie fara scripturi si fara a injecta nimic in executabil), sa nu "strice" jocul sau sa trezeasca suspiciuni unui spectator si sa nu fie nevoie de echipament special (ie. poti sa joci si fara microfon). In esenta, tot echipamentul (purchasable items) este notat cu o variabila (inclusiv combinatiile dintre arma secundara eg Deagle si primara eg AWP + HE), actiunile (comenzi radio,), grafitti si team dynamics (pozitionare site etc). Anyway, aici e paper-ul pentru cei interesati: https://github.com/cionutmihai/Hwyl/blob/master/Hwyl.pdf Am facut si un clip scurt de 9 min cu niste highlight-uri, l-am pus pe PeerTube acum cateva min dar e inca la etapa de transcoding... : https://peertube.video/videos/watch/8f6b0f5a-4063-4411-9f53-fc2b5895ff3a Evident, fara a avea un tabel cu notatiile si insemnatatea lor nu intelegi nimic, asta e si ideea Have fun
  2. Stegano is a basic Python Steganography module. Stegano implements two methods of hiding: using the red portion of a pixel to hide ASCII messages, and using the Least Significant Bit (LSB) technique. It is possible to use a more advanced LSB method based on integers sets. The sets (Sieve of Eratosthenes, Fermat, Carmichael numbers, etc.) are used to select the pixels used to hide the information. Changes: Fixed an error when revealing a hidden binary file in an image. Download: https://packetstormsecurity.com/files/download/141562/Stegano-0.6.8.tar.gz Source: https://packetstormsecurity.com/files/141562/Stegano-0.6.8.html
  3. What is Pixelknot? Pixelknot is an Android application that allows users to hide short text-based messages in photographs and share them across trusted channels. Pixelknot is now available on the Google Play store, Amazon appstore, and also on our website and verifiable via the asc. What is Steganography? The practice of embedding secret messages into a piece of media so that no one, apart from the sender and intended recipient, know that the secret message exists. The newly developed algorithm F5 withstands visual and statistical attacks, yet it still offers a large steganographic capacity. F5 implements matrix encoding to improve the efficiency of embedding. Thus it reduces the number of necessary changes. F5 employs permutative straddling to uniformly spread out the changes over the whole steganogram. The Guardian steganography standard: we are working towards ensuring that the secret message in an image must: Have the original image appear, to the trained human eye, unedited. Have the bytes of the image appear, to a trained analyst, undistorted so much so as to arouse suspicion. Have the complete message be recoverable no matter how it is transmitted. Screenshots Features Have a secret that you want to share? Why not hide it in a picture? With Pixelknot, only your friends with the secret password can unlock your special message. Everyone else just sees a pretty picture. It’s a fun and easy way to share hidden messages without anyone knowing. Take those pixels, twist them in a knot, and see for yourself! ? DISGUISE YOUR MESSAGES: Pictures are public, the text is hidden inside. Even a trained eye will think the image is unedited. It’s security through obscurity! ? FOR YOUR EYES ONLY: Put a password on the secret message to make sure that no one can read it except the person it’s meant for. ? EASY IMAGE CHOOSER: You can use the camera to take photos, or just use photos you’ve already taken. ? INVISIBLE CHANGES: Even a trained analyst analyst shouldn’t be able to detect any message. The image bytes should seem undistorted. ? SHARE ACROSS PLATFORMS: Want to share the images over email, file sharing tools (like Dropbox & Sparkleshare), social media (like Google+ & Flickr) or directly through Bluetooth or NFC? Not a problem! The messages are still recoverable on the other side. We’ll have even more tools (like Facebook) working soon, so stay tuned! ? AD-FREE: We want your love, not your money. ? MATHEMATICALLY SECURE: We use the newly developed steganography algorithm F5 which implements matrix encoding to improve the efficiency of embedding and employs permutative straddling to uniformly spread out the changes over the whole steganogram. ? ATTACK RESISTANT: We’ve launched attacks on images with messages hidden in them using a specialized version of stegdetect, an automated tool for detecting steganographic content in images. In most cases, the pictures have been impervious to attack. We will be including detection in an upcoming version of the application so you can easily test it yourself! ? ARTIST FRIENDLY: The app features the work of Pablo Picasso. His painting “Girl before a Mirror” from March 1932, to be exact. We hope it inspires you to share beautiful imagery and wonderful ideas. ? WE SPEAK YOUR LANGUAGE: Or at least we try to. Don’t see your language? Join us and help translate the app: https://www.transifex.com/projects/p/pixelknot/ Download: https://guardianproject.info/wp-content/uploads/2013/04/pixelknot-qr1.png Source: https://guardianproject.info/apps/pixelknot/
  4. Screen Dupa cum spune si titlul, acest soft ascunde text in imagini, pentru mai multe detalii vezi comentariul sursei. L-am pus aici ca sa ramana mai mult timp "vizibil", daca e vreo problema il mut la stuff. In 3 zile, 300 linii de cod, m-am gandit sa ma rezolv cat de cat cu atestatul si cum iubesc sursa libera si impartasirea ei pun la dispozitie asta: http://codepad.org/hNzxFzFT #! /usr/bin/env python # Text In Image # 02.01.2012 cmiN # # This is a simple GUI script which can hide text in pictures # using least significant bit method. # Also the input text can be encrypted and the output can be decrypted too # with a symmetric key using AES. # Writing is done directly on input image so be careful with certain extensions # because the output will always have the BMP format. # # Contact: cmin764@yahoo/gmail.com from Tkinter import * # widgets's classes from tkFileDialog import askopenfilename # get file name from tkMessageBox import showerror, showinfo # user dialog from PIL import Image # image converting from Crypto.Cipher import AES # text cipher class Engine: """ Code for processing the image. Separated from GUI. """ def __init__(self): """ Initialize parameters. """ self.ext = "bmp" # save format self.name = None # save name self.path = None # save path self.im = None # image object, read and write self.generator = None # get locations to write/read bits self.useAES = None # use it or not self.aes = None # AES object self.data = None # data to be written to image self.width = None # image width self.height = None # image height self.tmp = None # last string, used when key changes def binary(self, nr, size): """ Get 1&0 representation. """ return bin(nr).replace("0b", "").zfill(size * 8) def path_name(self, path): """ Split a file path in path and name. """ ind = path.rfind("/") + 1 return (path[:ind], path[ind:]) def set_generator(self): """ Useful for resetting. """ self.generator = ((wp, hp, ch) for wp in xrange(self.width) # WxHxC for hp in xrange(self.height) for ch in xrange(3)) def load(self, path): """ Load image. """ self.im = Image.open(path) (self.width, self.height) = self.im.size (self.path, self.name) = self.path_name(path) return self.width * self.height * 3 # total useful bytes def parse_key(self, key): """ If key exists make an AES object from it. """ if not key: self.aes = None # empty key == no encryption return self.parse_string(self.tmp) # must return size (see the next return) key.decode() # test availability size = len(key) for padding in (16, 24, 32): # fixed key size if size <= padding: break key += chr(0) * (padding - size) self.aes = AES.new(key) return self.parse_string(self.tmp) # if key changes you must update string def parse_string(self, string): """ Convert to bitstring. """ if not string: # without string can't start the process self.tmp = None self.data = None return 0 string.decode() # test availability self.tmp = string if self.useAES and self.aes: # encrypt it string += chr(0) * ((16 - len(string) % 16) % 16) # multiple of 16 string string = self.aes.encrypt(string) string = str().join([self.binary(ord(x), 1) for x in string]) # convert every char in a set of 8 bits size = self.binary(len(string), 4) # get binary representation of string's length in 4 bytes self.data = size + string return len(self.data) def write(self): """ Write using LSB. """ self.set_generator() # rearm for bit in self.data: (wp, hp, ch) = self.generator.next() # get next position values = list(self.im.getpixel((wp, hp))) # retrieve its values tmp = self.binary(values[ch], 1) # convert one of them values[ch] = int(tmp[:7] + bit, 2) # alter that channel self.im.putpixel((wp, hp), tuple(values)) # put it back self.im.save(self.path + self.name, format=self.ext) # save the new output def read(self): """ Read from every LSB. """ self.set_generator() # rearm total = self.width * self.height * 3 if total < 32: raise Exception("Text not found.") size = chunk = string = str() i = 0 # for(i=0; true; ++i) while True: (wp, hp, ch) = self.generator.next() # i byte values = self.im.getpixel((wp, hp)) tmp = self.binary(values[ch], 1) if i < 32: # it's lame but I prefer string/bitset size += tmp[7] if i == 31: size = int(size, 2) if size < 1 or (size + 32) > total: raise Exception("Text not found.") elif i < size + 32: chunk += tmp[7] if len(chunk) == 8: string += chr(int(chunk, 2)) chunk = str() else: break i += 1 if self.useAES and self.aes: if len(string) % 16 != 0: raise Exception("Text not encrypted.") string = self.aes.decrypt(string).rstrip(chr(0)) string.decode() # raise an exception if invalid return string class GUI(Frame): """ Main window, inherited from Frame. Here we put our widgets and set their behavior. """ def __init__(self, master=None, margin=30): """ Same as Frame's constructor. """ Frame.__init__(self, master, padx=margin, pady=margin) self.grid() self.widgets() self.behavior() def widgets(self): """ Build and grid widgets. """ # ---- create variables ---- self.totalBytes = IntVar() # depends on image size self.usedBytes = IntVar() # how many of them are used self.textStatus = StringVar() # used per total bytes self.useEncryption = IntVar() # 0-plain 1-AES self.mode = IntVar() # 0-read 1-write self.textOpt = dict() # text last config self.keyOpt = dict() # key last config self.loaded = False # image loaded or not # ---- create widgets ---- self.label = Label(self, textvariable=self.textStatus) self.about = Label(self, text="About", fg="blue") self.text = Text(self, width=30, height=5, fg="grey") self.scrollbar = Scrollbar(self, orient="vertical", command=self.text.yview) self.loadButton = Button(self, text="Load", width=5, command=lambda: self.action("load")) self.readRadio = Radiobutton(self, text="Read", variable=self.mode, value=0, command=self.set_state) self.checkButton = Checkbutton(self, text="Use AES", variable=self.useEncryption, onvalue=1, offvalue=0, command=self.set_state) self.startButton = Button(self, text="Start", width=5, state="disabled", command=lambda: self.action("start")) self.writeRadio = Radiobutton(self, text="Write", variable=self.mode, value=1, command=self.set_state) self.keyEntry = Entry(self, width=10, fg="grey", show="*") # ---- show widgets ---- self.label.grid(row=0, column=0, columnspan=2, sticky="w") self.about.grid(row=0, column=2, sticky="e") self.text.grid(row=1, column=0, rowspan=3, columnspan=3) self.scrollbar.grid(row=1, column=3, rowspan=3, sticky="ns") self.loadButton.grid(row=4, column=0, sticky="w", pady=5) self.readRadio.grid(row=4, column=1) self.checkButton.grid(row=4, column=2, sticky="e") self.startButton.grid(row=5, column=0, sticky="w") self.writeRadio.grid(row=5, column=1) self.keyEntry.grid(row=5, column=2, sticky="e") def behavior(self): """ Customize widgets. """ self.text.config(yscrollcommand=self.scrollbar.set) self.text.insert(0.0, "Text here") self.keyEntry.insert(0, "Key here") self.text.bind("<Button>", self.handle_event) self.text.bind("<KeyRelease>", self.handle_event) self.keyEntry.bind("<Button>", self.handle_event) self.keyEntry.bind("<KeyRelease>", self.handle_event) self.textOpt = self.get_opt(self.text) self.keyOpt = self.get_opt(self.keyEntry) self.about.bind("<Button>", self.handle_event) self.set_state() def action(self, arg): """ What every button triggers. """ if arg == "load": fileTypes = [("BMP", "*.bmp"), ("JPEG", ("*.jpeg", "*.jpg")), ("PNG", "*.png"), ("All Files", "*.*")] path = askopenfilename(parent=self, title="Open image", filetypes=fileTypes) if path != "": try: self.totalBytes.set(app.load(path)) except IOError as msg: showerror("Error", str(msg).capitalize().strip(".") + ".") # some formatting else: self.loaded = True self.set_state() self.master.title("Text In Image - %s" % app.name) # update name in title elif arg == "start": if self.mode.get(): try: app.write() except Exception as msg: showerror("Error", str(msg).capitalize().strip(".") + ".") else: showinfo("Info", "Done.") else: try: string = app.read() except UnicodeError: showerror("Error", "Text not found or wrong key.") except Exception as msg: showerror("Error", str(msg).capitalize().strip(".") + ".") else: self.text.config(state="normal") self.textOpt["fg"] = "black" # touched self.text.delete(0.0, END) self.text.insert(0.0, string) self.text.config(state="disabled") self.usedBytes.set(app.parse_string(string)) self.set_status() showinfo("Info", "Done.") def set_status(self): """ Get used per total bytes. """ string = "%9.3f%s/%9.3f%s" unit1 = unit2 = "b" used = self.usedBytes.get() total = self.totalBytes.get() if used > total: self.label.config(fg="red") else: self.label.config(fg="black") if used > 999999: unit1 = "Mb" used /= 1000000.0 elif used > 999: unit1 = "Kb" used /= 1000.0 if total > 999999: unit2 = "Mb" total /= 1000000.0 elif total > 999: unit2 = "Kb" total /= 1000.0 self.textStatus.set(string % (used, unit1, total, unit2)) def get_opt(self, widget): """ Get some options from a widget then pack them. """ opt = dict() opt["state"] = widget["state"] opt["fg"] = widget["fg"] opt["bg"] = widget["bg"] return opt def set_state(self): """ Enable or disable a widget according to option selected. """ if self.mode.get(): # write self.text.config(**self.textOpt) else: self.text.config(state="disabled", bg="lightgrey", fg="darkgrey") if self.useEncryption.get(): # use AES self.keyEntry.config(**self.keyOpt) app.useAES = True else: self.keyEntry.config(state="disabled") app.useAES = False length = app.parse_string(app.tmp) self.usedBytes.set(length) self.set_status() if self.loaded: # a file is loaded if self.mode.get() == 0: # read mode ok = True elif app.data != None and self.usedBytes.get() <= self.totalBytes.get(): ok = True else: ok = False else: ok = False # no file loaded if ok: self.startButton.config(state="normal") else: self.startButton.config(state="disabled") def handle_event(self, event): """ Handle events for specific widgets. """ if event.widget is self.text and self.text["state"] == "normal": if self.text["fg"] == "grey": self.text.delete(0.0, END) self.textOpt["fg"] = self.text["fg"] = "black" string = self.text.get(0.0, END).strip() try: length = app.parse_string(string) except UnicodeError: showerror("Error", "Invalid text.") else: self.usedBytes.set(length) self.set_state() elif event.widget is self.keyEntry and self.keyEntry["state"] == "normal": if self.keyEntry["fg"] == "grey": self.keyEntry.delete(0, END) self.keyOpt["fg"] = self.keyEntry["fg"] = "black" key = self.keyEntry.get()[:32] # first 32 (max size is 32) try: length = app.parse_key(key) except UnicodeError: showerror("Error", "Invalid key.") else: self.usedBytes.set(length) self.set_state() elif event.widget is self.about: showinfo("About", "Hide text, which can be encrypted with AES, in pictures, preferably bitmaps. Coded by cmiN. Visit rstcenter.com") if __name__ == "__main__": app = Engine() # core root = Tk() # toplevel root.title("Text In Image") root.maxsize(350, 250) root.iconbitmap("tii.ico") # comment if you don't have one GUI(root) root.mainloop() Testat pe windows, fedora si slackware, merge perfect, dar sa cititi comentariul principal. Aveti nevoie de python 2.7, PIL si pycrypto. Pe linux de obicei sunt preinstalate. Versiune portabila: box gamefront Updated: 14.01.2012
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