Public key cryptography

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Which of the following types of cryptocurrency wallets is generally the most secure?

1 point

Brain wallet

Hardware wallet

Web wallet

Bi-fold wallet

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Is it a good idea to roll your own crypto?

1 point

Yes

Yup

Totally

Hell no

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Why do cryptographic signatures sign the hash of the message instead of the message itself? (select multiple)

1 point

There can be security vulnerabilities in signing a raw message

It's a convention inherited from PGP

There are no known algorithms for signing long messages

Signing long messages is slow

How are Bitcoin addresses derived?

1 point

sha2(sha2(private_key))

ripemd160(sha2(public_key))

encrypt(public_key, private_key)

sha2(ripemd160(public_key))

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What security assumption does elliptic curve cryptography (ECC) depend on?

1 point

Euclidean geometry

The hardness of multiplying points on elliptic curves

The hardness of factoring

The hardness of discrete logarithms

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Which of the following statements describes encryption?

1 point

Transformation of a message into an obfuscated format that can only be reversed using a secret key

Transformation of a message into a publicly decodable format

A one-way transformation of a message into a fixed-size output

The only way to efficiently scramble data

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What is "asymmetric" about asymmetric cryptography?

1 point

No two keys are the same

The keys to encrypt and decrypt are different

The algorithms have arbitrary key sizes

The keys are palindromes

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