From the course: CompTIA Security+ (SY0-701) Cert Prep: 1 General Security Concepts
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Hash functions
From the course: CompTIA Security+ (SY0-701) Cert Prep: 1 General Security Concepts
Hash functions
Hash functions are extremely important to the use of public key cryptography, and, in particular, to the creation of digital signatures and digital certificates. Let me start by giving you the technical definition of a hash function, and then I'll explain it to you piece by piece. A hash function is a one-way function that transforms a variable length input into a unique, fixed-length output. Now, let's pick apart of that definition. Hash functions are one-way functions. That means that you can't reverse the process of hashing. If you have content, you can use a hash function to calculate the hash value of that content, but you can't go the other way around. If you have a hash value, you can't use it to figure out the original text unless you already have a copy of that text. Hash functions map variable-length input to fixed-length outputs. That simply means that you can send input of any length to a hash function, and the hashes that it produces will always be the same length. Feed…
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Trust models2m 52s
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PKI and digital certificates4m 5s
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Hash functions7m 38s
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Digital signatures3m 50s
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Digital signature standard1m 27s
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Create a digital certificate4m 55s
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Revoke a digital certificate1m 28s
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Certificate stapling2m 29s
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Certificate authorities6m 13s
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Certificate subjects3m 35s
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Certificate types2m 55s
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Certificate formats2m 30s
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