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Introduction: Encrypted Note Storage V2.0
Encrypted Note Storage is a device that encrypts and securely stores your notes. It relies on the Serpent cipher for encryption and the HMAC built on the SHA256 hash function for message authentication. I did my best to make this device as affordable and easy to use as possible. You can also store the notes in the external database with an additional level of encryption.
Features:
- Integrity check;
- Message Authentication.
Supplies
You only need a single ESP32. Although in some cases, you might also need a 10mkf capacitor, only to flash the board.
Step 1: Encryption Algorithm
The encryption algorithm is as simple as it can be. I didn't depict the key on this diagram because its presence is obvious. MAC hashes the whole plaintext (it's not on the diagram too).
Step 2: Output Structure
The first 64 characters of the output is a tag. Every 32 characters after that are the blocks encrypted with Serpent. If the plaintext length isn't multiple of eight, then the padding is applied.
Step 3: Install CP210x Driver and Configure Arduino IDE *optional
If you've never flashed ESP32 before you'll need to configure Arduino IDE and install drivers to upload the firmware to the boards, you can download the CP210x driver here: https://www.silabs.com/developers/usb-to-uart-bridge-vcp-drivers
In case you don't have Arduino IDE, you can download it here: https://www.arduino.cc/en/software/
Configuring IDE isn't a part of this tutorial, you can read about it here: https://randomnerdtutorials.com/installing-the-esp32-board-in-arduino-ide-windows-instructions/
Step 4: Download Firmware
You can download the firmware here: https://github.com/Northstrix/Encrypted_Note_Storage_V2.0
Step 5: Download and Extract the Serpent Library
You need to download the Serpent library and extract it into the folder with the sketch.
Step 6: Generate the Keys
The best way to do it is to throw 20-sided dice.
If you get a number from 0 to 9, write it down.
If you get a number from 10 to 15, write down a letter corresponding to that number.
10 = A;
11 = B;
12 = C;
13 = D;
14 = E;
15 = F.
If you get 20, write down 0.
If you get something else, don't write anything and throw the dice again.
If you don't want to use that method, you can use the random number generator from the same repository in GitHub. Just beware that it's untested. I can't guarantee that it produces a random output. Use it at your own risk. If you have a tested RNG, don't hesitate to use it instead!
The serpent key must be exactly 64 characters long.
MAC's key can have an arbitrary length. I would recommend you to make it longer than 300 characters. In my case, it's 329 characters long.
Step 7: Modify Firmware
Open the file Encrypted_note_storage_version_two.ino and replace the existing keys with those you've generated.
Step 8: Flash ESP32
Some boards will flash without any problems.
Unfortunately, that's not the case for all boards. if you configured IDE correctly, installed drivers, and selected the right port, and still keep getting this error: A fatal error occurred: Failed to connect to ESP32: Timed out waiting for packet header
Connect a 10mkf capacitor to the board while flashing.
Connect the positive lead of the capacitor to the EN pin of the ESP32
Connect the negative lead of the capacitor (usually indicated by the gray stripe) to the GND pin of the ESP32
Step 9: Encrypt Record
I was able to encrypt and then decrypt a 1000-characters long plaintext without any problems whatsoever!
You can encrypt a 5000-character plaintext without any problem. But you won't be able to decrypt without breaking it into four parts, and in that case, the integrity check and message authentication won't work!
Important note: The feature of saving ciphertext into the built-in memory is untested, and there's no guarantee that it will work correctly. Work with the built-in memory at your own risk.
To encrypt a record:
1) Open the Serial Monitor;
2) Set the baud rate to 115200;
3) Reboot the board
4) Enter 1 into the text field, and press send;
5) Enter the plaintext into the text field, and press send;
6) Copy the Ciphertext from the text box.
7*) If you want to save the record into the device's built-in memory, enter 1 into the text field, press send. Enter the filename and press send, after that, paste the ciphertext into the text field and press send again.
As you might've already guessed, storing the tag in an unencrypted form makes this device vulnerable to the chosen-plaintext attack. Beware of it!
Eventually, I came up with these results.
Plaintext:
Encrypted Note Storage is a device that encrypts and securely stores your notes. It relies on the Serpent cipher for encryption and the HMAC built on the SHA256 hash function for message authentication. I did my best to make this device as affordable and easy to use as possible. You can also store the notes in the external database with an additional level of encryption.
Even though the main feature of this device is message authentication, it also comes with a cryptographically strong encryption algorithm. The biggest known flaw of this device is that an attacker can discover the content of the message by implementing a chosen-plaintext attack, but I wouldn't be worrying about it too much because an attacker needs either the device or the keys that you've generated for your device to discover the content of the message by using this attack. Even with the HMAC's key, the brute force is infeasible unless your note is just several letters long.
Serpent key:
e43bb9373773441cd510b8aaa1878e179cf12e84cecef5c33cc30bf777b8feae1ff5d21feddfd3161fc988947472c5309bae3a6b9f80273720b8d811daaf2893
HMAC key:
fba72814e175c7b459b456e17256fa5f42d06bcc29438bb9faa4fb5eef56603e143798b18db56cebb342411cfc7125c0b0e32c8d68994db1c3a809a9c67e578fc97d11e48f6a114b6db87816cd10caecd398653094d44fdd36efc6e01fe20a55043685bbad9acc2dbbb95e86b625bd25f619e4b893ccd350efe33cadea55f9a3d6b531bbb186896a63948818da2864ebffefec926627c1e7827a90a044cc5858457d7d813
Ciphertext:
41917d939a8496cbf7214b7849821f36b1854468748d85a073544d2d0b777c689C9E5BF975B9E126E2810A299735A83A49A27375BB0CE56BDEFE1A19B91EC6C839B18D3F501F6BF163FAB1BF5AFE8337F307360F13CF77B862499FA227037C5ED8D4D2DC345C087B39D7EF917EDD219CA803BA45E3E7CE52A8749A334535EB37660EC6A0034EA9E8B8DF5B3CC6AF795529D62D9389076231661E6D43839E94F46941B5F850816F15CF7CF5068105F5407B3DD319A766E673EA0F7A3AF5763E881871765F0EF9DC6DFDDA54E1D59C50187A3C17D4A7A5D02BFCF70B5436FB207F1A3CAF073D7FDB91CE3804124F745AF68F6BDC72D2580B0613B364CDA78AEE71AF9C9BB3BA1F1B38E59C2C39646D4C77BC4DBD786FBE8AADB39A8AA0275DCCB1C750122402845052D6053AA7A3B42402216CB1EB1C9AF2A373FE3E313AE6AB1C504E16962907D94D759DC2E9C7E8756506809A265F37DFBB9FFE1112AF574F8959E04646D0DAC836BCF8603D6F3158F54C0710AB918533F7E5F46087D21EAD40D9E6D2E262B4FEEE7ABC2EEE961DF0CFF35D6709F38CB7C9DE89B4D4B2E1F9B7F371A16EF67EDB865016585DA1C69AEBD7A7671597DF402AA99690ADC05B743FC21F1B4659EE1C5E9BB9805DF2D99A89B3CA734BCA58179171D1819BA26921DFFB8664AF1D683496911C544A6CECFBE2619B2BC6AA4F036A667AD8A23A55AE28DE8786DA68A61E58E94321E6723E508BD94B185C76D71D90A4CC979302285B68DDF502CEA1906251A8CE04FDC5389DFC7647D8541364CBBD787C5C171119DF49993E7B8384F6A11E70CBA07C2FAEA460D55500E84F26CAE21C428605DB465E66FE2F2914913F955AA1F95C3B6D7BE866AC8BCB0DFB33D65836947DC8BBB87B8908F1B4910FA98B8E17942051264FA4D870B93D0320123E6A49FA339025D3AE7D9B93C449A98822846777713B8A0E896D4C9C6A23BCDA2C0D71F2697C5C0483C83E62A48CD479B4002F70A3BF75B340328C22B1C05BFB86F13CF59C2F08583E65FC54FE6A5AB1E62503DEDDEE2131E2BF0DE5E61545C4A465D401D3A3183F04316B254FD549913EEA657965BAB159B848E8416A4FF2572D74282A1F65247DF2B33308D1B258143F72AF593A9DE4E3B2F0C219C03CB6FE9A4FE96E7D1944D7972A4D9E925089B2A7C6816615C5156E6688A1A2C312A5F028CBF554EF72CF25A08CBA9C2E5554EC074671D903E1628CFF888BC0BC8D9B0250F4CE8E57D1C471A3DEFB207843CA10DE4B090D87B1091CE1A5BF717790E9537C2DEABF76817C9958D5691632A4A843A063F9122D6AB18F12C729A24761A241673FC8397CA18925602C0F7B52C4C1F875E3B53492250E4EA9F70482D204D524A76C0461D7FF083A48226F08804134CD8C44C5B4AEA877D8D59AECD9386B1541004B859F28F345E39485918613C18B0598A5E01D0680884E53F278E9C7B5EAD27A90FF21C4005B1BC4DBC2C61181E56950913ED2AD2118AE7FD25D2191E016CAA3CB7CEFA37929CCA19BFDECE53DAFA109815711A36E6E7D7134DAA6AC4BBF611709BD62B08C0850D7160C1EF8504B12A34702D2F3FE11C13CD1AFBB2A49148F12C4C772068ED41EF68C342B36F07AC6DDD775BE6965C5F88DFD867E15E16642B0B7F562E2566E89241435E5AC4F526C250F78AEB8E59714713677FA9E1CF616AD50BA8A6A92317D20975380EFFF06630F59D94E68E33FBCA221E1B52B2B3CE11F456D84E0FCEE4FDD6C84E8C814970A1996EC092A47ADF1AC56EEC523BDFA1BBA23B03E8D67CD91824ED60E07B30225785FB159C1E64E9B69C63A5564C66B9B4EFCE49379030B65ABBDD77A9C246175B2A15E5E59833CD34949E31D41DF05878046B4C749F50724D450F0B83A220582FD426AE342B880CDE4D04EFF73F523B98A0B46F897CCB4A6565E2BB4423ED032B34B44DAE4B33F6705095ED9E0243178B32B02D75372B1B9E8D1929F4D3046BE8F13872652808765485B51CDF956A0F20C3C7597FFD3D461B715DC5099131AEBD72FD957F49364E0E842C35D838E3C7DDD16E348B12000C7B2EEB1C8CF4B823D0659C20173B782D98CE895AEEBA6C23972C811896BEF50E5B0A9B0D07A7C6F70BDB59541E1586BF8428096300F07D72331118F8AEA33690921828C5F8B8860F89F556D13EBBB6C18D5C6341BF76477DEEE3DAB1652419E41C4E5CF629957375771AA3C05D33201EDD3A2872B703865C10219A64EA9FE949EE873FB0607591B54BD45AEC3EDA9451CB1E392F96DA6A4639F15B642BEC8897B752705E07E46FD907271BA14546E2631DAA890C07B9A25953749CE50912687E6A90310193217802763A2AE1526BD87702447A51215E408B5C6BC3733FDAB7ECD5F4FA377058D2207151F2A51514A4551AB3BE3A5A546C5B3EA274CD64BFB433570BF60DA679F7A51ECF3920D045A45903FF3CCEDC4C8A0F6B9046F132652DBD668FB108AFC097DF3A01AB837618EFF694239B74B7025FABEFAD03C7BAD20856E1D8132A01ACCE80A33E56146301DE79CEF287930573BFFEA7C61691B95D7EB5E68B2ADCABFA06E959FB1BFF2F24864A52860B0C950716BD7CCB76B33C42DA7D6D47C5D5B105A6E4DD4D6DEA04CB38D4E6BB2BC9B2C1569DD8196EC5AD06B5012EFAC02E2C304ABF31F97A9C738A41315920363467D2C17B7995FFF6969381C07DCE778EF6B3C12B786E5254C14C7D30015A698D2047CCF2252DADDA1CFD785F78730
Step 10: Decrypt Record
To decrypt a record:
1) Open the Serial Monitor;
2) Set the baud rate to 115200;
3) Enter 2 into the text field, and press send;
4) Enter the ciphertext into the text field, and press send.
The device decrypts the note and then computes the tag for it. If the tag attached to the ciphertext is the same as the computed tag, you'll see a message: Message authenticated successfully!
Otherwise, you'll see: Failed to authenticate the source of the message!
Step 11: Extract Record From Built-in Memory *experimental
Records stored in files.
Let's suppose that there's a file in memory with the name Note and the content e6740e1b5c0b67f281bffc9ff124c4edccb9f9324cf7d1be2f1dce5ae252bab41F872B4FD25FE1936517E730C8F08381
To extract the content of this record:
1) Open the Serial Monitor;
2) Set the baud rate to 115200;
3) Enter 3 into the text field, and press send;
4) Enter the filename into the text field, and press send;
5) Copy the content of a record.
Step 12: Remove Record From the Built-in Memory *Experimental
To remove the file:
1) Open the Serial Monitor;
2) Set the baud rate to 115200;
3) Enter 4 into the text field, and press send;
4) Enter the filename into the text field, and press send.
Step 13: Add a Record to the Database
Built-in storage is limited and still untested. There are much better and more reliable options to store your notes. I can only suggest one of my previous projects called Twinkle. Twinkle encrypts all records with DES. It adds another level of encryption and kinda solves the problem of the chosen-plaintext attack (but only if the ciphertext obtained by an attacker is a ciphertext from Twinkle or another encoder that supports randomized encryption).
The extended encryption algorithm will look like this if you store the encrypted notes in Twinkle.
Step 14: Generate 16 Character Key
Twinkle requires a 16 character key to encrypt and decrypt your notes.
And again, throw the dice.
Since I'm going to expose the key to the whole world, I've reused a key from a previous project, don't ever do that! Always generate your own keys, and never reuse them!
Step 15: Load Key Into the Twinkle
To load the key, click File -> Select key. In the pop-up window, locate the key that you've generated, click on it, and then press Open.
You need to load the key every time you're opening the program.
Step 16: Save Record
To save a record: Paste the encrypted note into the Twinkle, and then click File -> Save. After that, navigate to the folder where you want to save your record, enter the name of the record, and press Save.
I've chosen the name Note.txt
Step 17: Create Table
To use a built-in database you need to create a table for the data (Built-in storage -> Create table), You only need to press this button in two cases:
1) You've never pressed it before;
2) You've deleted the file called stuff.db
In case of successful creation of the table, you will see the corresponding message.
If you press this button without a need to do so, you will get a pop-up window with the error.
Step 18: Add Record to the Database
To add a record to the database, click Built-in storage -> Save record. Name your record as you wish and press OK. Now, navigate to the record that you've saved in step 16, select it, and press Open.
In case of success, you will get a corresponding message.
Step 19: Extract Record From the Database
Let's suppose that a couple of days have passed, and now you need to retrieve your note from the database and decrypt it.
To retrieve the record from the database, open Twinkle, load the same key that you used to encrypt the record, click Built-in storage -> Load record.
In the pop-up window select the record that you want to load and press Select.
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Copy the encrypted note from the text box and decrypt it the same way you would decrypt any other note (step 10).
Step 20: Final Thoughts
Even though the main feature of this device is message authentication, it also comes with a cryptographically strong encryption algorithm. The biggest known flaw of this device is that an attacker can discover the content of the message by implementing a chosen-plaintext attack, but I wouldn't be worrying about it too much because an attacker needs either the device or the keys that you've generated for your device to discover the content of the message by using this attack. Even with the HMAC's key, the brute force is infeasible unless your note is just several letters long.
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Anything Goes Contest 2021
TurnStyle® 10 V2.0
SKU#: 710461
26
Lightweight sling bag for DSLR camera system, tablet, chargers, memory cards, and more.
KEY FEATURES:
- Easy rotation for rapid access to gear and accessories
- Stabilizer strap holds the bag steady while active or tucks away when not in use
- Dedicated, padded pocket fits a 8' tablet
Additional Features+
- Slim, contoured, body-conforming design with a wide shoulder strap provides a very comfortable fit
- Lightweight materials and construction
- Breathable 320G air-mesh back panel keeps your back cool during long days
- Easily accessible front organizer pocket for batteries, memory cards or other small accessories
- Rear internal pocket holds documents
- Fully customizable interior dividers
- Seam-sealed rain cover included in dedicated pocket
What Fits +
- Standard DSLR
- Larger mirrorless system (Sony A7, Panasonic GH4)
- 8” tablet
- 24-70mm f/2.8 or f/4 attached
- Additional lenses
- Example: Sony A7RII with 24-70mm f/4, 55mm f/1.8, flash and an 8' tablet
Specifications-
Internal Dimensions:7.1” W x 12.6” H x 4.8” D (18 x 32 x 12.2 cm)
Exterior Dimensions:
8.3” W x 15.4” H x 5.2” D (21 x 39 x 13.2 cm)*
Small Tablet Compartment:
6.3” x 8.7” x 0.4” (16 x 22 x 1 cm)
Weight:
1.0lb (0.4kg)
Shoulder Strap Length:
35–68.3” (includes length of product)
Rapid Note V2 0 Download
Stability Strap Length:
Rapid Note V2 0 Pro
59.3” (includes length of product)* Note that the product tapers significantly and dimensions are taken at largest point.
Materials+
Exterior:- Durable water-repellant (DWR) coating
- Polyurethane coating
- YKK® RC Fuse (abrasion-resistant) zippers
- 420D velocity nylon
- 550D polyspun
- 320g air mesh
- Nylon webbing
- 3-ply bonded nylon thread
- Removable high density closed-cell foam dividers
- P210D silver-toned nylon
- Polyurethane backed velex liner
- 2x polyurethane coated 210T seam-sealed taffeta rain cover
- Nylon binding tape
- 3-ply bonded nylon thread
In The Box+
Reviews+
Lightweight sling bag for DSLR camera system, tablet, chargers, memory cards, and more.KEY FEATURES:
- Easy rotation for rapid access to gear and accessories
- Stabilizer strap holds the bag steady while active or tucks away when not in use
- Dedicated, padded pocket fits a 8' tablet
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10/17/2021
This is my first camera bag for my first “real” camera and I love it. It stays close to my body when walking & hiking and feels secure, and holds my Nikon Z5 camera with the zoom lens on and a few extras. I really like how easy it is to access the camera by swiping the bag around without needing to take it off. The bag seems very well constructed and feels like it will hold up well over time.
09/29/2021
Great bag! Perfect size for my Fujifilm mirrorless XT-2 and 2 lenses(1 zoom and 1 Prime), 2 lens hoods, 1 small flash, 2 batteries, a battery charger, and 4 SD cards. I really like the way the bag can rotate around front to sit on your chest to access my gear when needed. The waist strap is great to hold the bag in place when moving around. And the strap folds away into a compartment when not in use. The zippers are well made. I also found the customer service people were excellent. The shipping carrier messed up my package for over a week. When I alerted the customer service people they overnighted my bag to me for the next day. They were excellent! So happy I purchased from this company.
07/09/2021
Just got my Turnstyle 10 v2.0 . It did not disappoint! Very well constructed, Whoever designed this bag, knew what they were doing. I love the comfort and the way you can swing it in front of you and it makes a solid arm rest for shooting without a tripod. Everything I need fits with room for phone, wallet and other non-camera items. Just the right size and shape. My travel gear- NikonD5600, 18-55mm zoom, 35mm, 70-300mm zoom, 2 xtra batteries and the charger.
05/09/2021
Rapid Note V2 0 Price
I was looking for a bag which was light and would carry 1 camera with a lens along with a few memory cards and extra battery. This bag touted even room for a tablet. This bag is hardly large enough for my Canon 5d III without a lens on it. With a short lens, it is a very tight fit. The bag might be all right for an amateur photographer with a small camera and lens, but not for a larger professional camera and lens.
05/19/2021
Online Rapids Notes
Hi Bev, may I ask how you have yours packed? (I used to use my 5DMk3/24-70 in the TurnStyle 10, I'd pack it running along the bag, sideways if you will (Same is it is on our website) pop a note to customer service via reply, they may be able to offer further assistance. Thanks, Simon
01/06/2021
I got this for Christmas from my girlfriend and loving it. I took it to the snow with a gh5 using a laowa 7.5, a voigtlander 17.5mm, a rodemic, and a joby handle. A little snug fit but it all fits and with 4 batteries for a gopro5 and gh5. Altogether fits well and didnt damage any of it falling in the snow a good 10 times probly. Material on the outside still feels really good after being in the snow from about 1pm-6pm. I was scared the material would go bad after a few falls but it stayed good and I didnt even have to use the raincoat they provide to cover it. I still have to mess with the bag but its really ideal for those who like to use just a body and maybe 2 lenses. Ideally its not SUPER hard to pull out the camera but if the zippers widened up more it would be nice. Doing that though may make it so easy ALL the equipment falls out so I get why the zippers stop where they do. Overall so far 5/5 - only 2 weeks use.
Warranty+
At Think Tank, we build our products for the daily impacts of travel and demands of working professionals over extended periods of time. We build many of our products with user replaceable parts to keep your bag going for years.
Return Policy+
If you are not completely satisfied with our product, you can return it unused within 30-days for a full refund less shipping costs. Refunds will not be issued until the product is received and inspected to insure that it contains all the parts and is clean and unused. Note that we do not pay for shipping to have you return it to us.