Hashing vs Encryption — Simplifying the Differences - Comodo SSL Resources (2024)

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Think that hashing and encryption are the same? Think again

Ah, yes, hashing vs encryption. For those of you who have no idea as to what hashing or encryption is, it’s pretty much like a blank paper that we’ll fill in for you momentarily. But for those of you who have a vague understanding of either hashing or encryption, you may still have some confusion as to whether hashing and encryption are the same thing or if they’re two different processes.

A lot of people use the two terms interchangeably, but that’s incorrect. So, if you’re one of them, sorry to burst the bubble, but hashing and encryption are two different (but related) things. The biggest difference between them? Encryption is reversible — hashing is not.

In thispost, we explain the key differences between hashing vs encryption — orencryption vs hashing, if you’d prefer —and where each is used.

Breaking Down Hashing vs Encryption: What is Hashing?

When wetalk about hashing, we’re talking about a one-way process that uses analgorithm to take data and convert it to a fixed length known as a hash value (alsoknown as a hash digest). The length of the hash generated is usually fixed andsmaller than the original text or string; though it varies widely with even thesmallest variations in input. It is almost humanly impossible to revert a goodhashing digest back to its original form.

There aredifferent hashing algorithms used in hashing. Here are some of the most importantones:

MD5: MD5 used to be themost popular hash algorithm which converted a 16-byte hash value to a 32-bithexadecimal number. It has been deprecated from use because of vulnerabilitiesfound in it, but it can still be used as a checksum to verify data integrityonly against unintentional corruption.

SHA-0: SHA-0 is the firstSHA algorithm of the three groups of SHA algorithms. SHA-0 has been deprecatedfrom use thanks to its susceptibilities. This algorithm was soon replaced by theSHA-1 algorithm.

SHA-1: SHA-1 is the successor of the SHA-0 and became the most widely adopted algorithm of the SHA family. It produces a 160-bit (20-byte) hash value known as a message digest — typically rendered as a hexadecimal number that’s 40 digits long. However, it was found to be insecure and since 2010, many organizations recommended its replacement with SHA-2 algorithms. In 2017, all major browsers deprecated the use of SHA-1.

SHA-2: After being deemed insecure by major platforms, SHA-2 replaced SHA-1 and became the most widely adopted hashing algorithm. It might be carrying the family name but SHA-2 is significantly different from its predecessor. The SHA-2 family consists of six hash functions — SHA-224, SHA-256, SHA-384, SHA-512, SHA-512/224, SHA-512/256 — with digests (hash values) that are 224, 256, 384 or 512 bits

Uses of Hashing:

Unlike encryption, hashing serves as a checksum to ensurethat a particular piece of data or a file hasn’t been altered.

• Hashing is the most suitable way to securely store passwords. By storing passwords in a good hash format, it’s almost impossible for anyone to access your raw data.
• Hashing is helpful in comparing a value with a stored value, hence avoiding duplication. This can be done by storing the hash with a salt, and then with any future login attempts, hash the passwords that the users enter and compare it with the stored hash.
• Hashing is used in a variety of digital certificates, including SSL certificates.
• Hashing helps you find specific data in a huge database.
• Hashing algorithms are used like a digital certificate in cryptographic applications.

Breaking Down Hashing vs Encryption: So, What is Encryption?

Encryption is the process of turning a data into a series ofunreadable characters which are not of a fixed length. The key differencebetween encryption and hashing lies in the fact that in case of encryption, theunreadable data can be decrypted to display the original plaintext data withthe help of the right key, whereas in hashing, this cannot be done at all.

Encryption of data is done through the use of cryptographickeys. The data is encrypted before it’s transmitted and decrypted by the user.Based on the nature of the keys, encryption can be done in two ways — namely,symmetric encryption and asymmetric encryption.

• Symmetric Encryption: In case ofsymmetric encryption, the keys used for both encryption and decryption are thesame. That is, the data can be encrypted and decrypted using the samecryptographic key.
• Asymmetric Encryption: In this case, thekeys used for encryption and decryption are different. The key used forencryption is known as the public key, whereas the key used for decryption isthe private key. As the name suggest, public key is known to every user thatvisits the website, whereas the private key is only available to the intendedrecipient or party.

Uses of Encryption

At its core, encryption is all about asserting identity and protectingdata integrity:

• The origin of encrypted messages can be traced,thus facilitating authentication of the message source.
• In case the data gets leaked, it’s easy to tracethe source. In other words, it’s easy to trace who did it and when, thus makingauditing for accountability easy. It helps in resolving security breachesefficiently.
• As the name suggests, encryption encrypts a datain such a way that only intended parties with the right private key can readthe data or find the information in the data.
• Encrypted messages cannot be exchanged or readby another person — it can only be read by the intended recipient.

Hashing vs Encryption — An Overview