What is Triple DES and why is it disallowed?

<p>Triple Data Encryption Algorithm was used widely across many industries and in many popular network protocols to encrypt data at rest and data in motion. NIST deprecated the algorithm in 2018 and disallowed its use after 2023.</p>
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<section class=”section main-article-chapter” data-menu-title=”What is Triple DES?”>
<h2 class=”section-title”><i class=”icon” data-icon=”1″></i>What is Triple DES?</h2>
<p>The <a href=”https://www.techtarget.com/searchsecurity/definition/Data-Encryption-Standard”>Data Encryption Standard</a> algorithm on which Triple DES is based was first published in 1975. DES is a symmetric key <a href=”https://www.techtarget.com/searchsecurity/definition/block-cipher”>block cipher</a>. Symmetric key block ciphers process fixed-size blocks simultaneously using the same key to encrypt the data. The block size of a cipher refers to the number of bits that are processed together.</p>
<p>The original DES algorithm specified the use of 56-bit keys. As computing advanced, this proved ineffective protection against certain attacks. The algorithm was retired in 2005.</p>
<p>In 1998, Triple Data Encryption Algorithm, commonly referred to as Triple DES, TDEA and 3DES, was introduced. It applies the DES cipher algorithm three times to each data block for more effective key length.</p>
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<section class=”section main-article-chapter” data-menu-title=”A brief history of DES and Triple DES”>
<h2 class=”section-title”><i class=”icon” data-icon=”1″></i>A brief history of DES and Triple DES</h2>
<p>In the early 1970s, the National Bureau of Standards — now NIST — identified a need for a government-wide standard for encrypting unclassified, sensitive information. Early proposals for the new DES were not deemed acceptable. Then, a block cipher called Lucifer was submitted by IBM Corporation in 1974. After consultation with the National Security Agency (NSA), a modified version was approved as a Federal Information Processing Standard in 1976 and published on Jan. 15, 1977, as FIPS PUB 46. It was authorized for use on all

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