ZCrypt V3.0

New Features

RSA

• ZCrypt now offers encrypting messages with RSA using Python RSA module
• Only messages can be encrypted for now
• Support for crypting time, sender and receiver will come in a future release
• RSA mode has many ZCrypt mode features see comparison below

Added two new options in setting

1. Ability to set a default encryption mode (using RSA or ZCrypt)
2. Ability to set a custom RSA key length (bits)

Improvements

• Better UI -> unified message titles (error, warning, infos...)

Key differences and features between ZCrypt algorithm and RSA

Features	ZCrypt	RSA
Encrypt messages	✅	✅
Encrypt metadata (sender, receiver, date)	✅	❌
Save encrypted content to a file	✅	✅ (in byte mode)
Warning before file overwrite	✅	✅
Save decrypted content to external file	✅	✅
Automatically retrieve key from file	✅	✅ (if you saved privKey when encrypting)

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RSA or ZCrypt ?

ZCrypt encryption algorithm offers low security level of encryption but a very fast encryption process
RSA on the other hand offers much better security at slower speed
Here is a little comparison between both

Time taken to encrypt "This is a test message for ZCrypt V3.0 release !!"

Tested on a non-overclocked Raspberry Pi 4 on a single process

Operation (in sec)	ZCrypt	RSA (512 bits)	RSA (1024 bits)	RSA (2048 bits)
Generate keys	< 0.1	0.2	0.8	3.0
Encrypt message	0.3	0.5	1.2	11.1

Choose the one that best suits your needs !