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Issues with Security? Fight Fire with Fire!

Flashbulb-Protected Analogue Memory Add-on For the Tamper-Evident Box

Issues with Security? Fight Fire with Fire!
Issues with Security? Fight Fire with Fire!
Labs Project
Based on a Labs project | December 2020 | Find it here
In the previous article in our series of projects on DIY highly secure communications [1], it was shown how to build a secure tamper-evident box (TEB) that will warn its receiver, Bob, that it was opened after Alice had put it in the mail. In this article, we will make it even more secure with the use of technology from the beginning of the previous century.
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Materials

Component list

Component List

[illustration 200647-005-94]

[illustration 200647-006-94]

 

Resistors (5%, 0805, 0.125 W)

R1,R2,R3 = 100 k
R4,R15 = 10 k
R5,R8, R11 = 220 Ω
R6,R14 = 1 M
R7,R10,R12 = 1 k
R9 = 330 k
R13 = 560 k
R16 = 5.1 k (5.6 k // 56 k)

Capacitors

C1 = 10 µF (1206)
C2,C3 = 2200 µF 6V3, 5 mm pitch
C4,C6,C7 = 100 nF (0805)
C5 = 47 nF (0805)

Inductors

L1 = 1 mH, 10 Ω

Semiconductors

D1,D3,D4 = 1N4148W
D2,D5,D6 = BAT54
IC1 = 74HC154D
IC2 = MAX9915
IC3 = BME280
IC4 = LM234Z-3
IC5 = LM285D-1.2
LED1,LED2 = LED, red, 0805
T1 = BC857
T2 = BSS205N

Miscellaneous

K1 = 10-way pin socket, 0.1” pitch
K2 = 2-way clamping connector, 5.08” mm pitch, Wago 236-402
SW1,SW2 = Push-button, RS282G05A3
SW3 = Slide switch, SS12SDP2

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