Plain text is a simple format for storing written information using only basic characters like letters, numbers, and punctuation marks, without any formatting like bold, colors, or special fonts. It is one of the most basic and universal ways to save and share text files.

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Randomness in cryptography ensures that encrypted messages cannot be predicted or reproduced the same way twice, making it extremely difficult for attackers to crack codes or forge security keys. Without randomness, hackers could use patterns to break encryption.

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A sound card is built into a computer's motherboard and handles basic audio, while an audio interface is an external device that connects to your computer and provides professional-quality audio recording and playback. Audio interfaces are designed for musicians and content creators who need higher quality and more control.

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Compromised default cryptographic keys allow attackers to decrypt sensitive data, forge digital signatures, and impersonate systems or users. This creates widespread security breaches because default keys are often publicly known or easily obtained.

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Firmware is permanent software that controls how electronic devices work and communicate with their hardware components. It acts as the bridge between the device's physical parts and the programs users run on it.

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